Câu hỏi:

20/07/2024 446

Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question

Coral reefs are some of the most diverse ecosystems in the world, housing tens of thousands of marine species. With their hardened surfaces, corals are sometimes mistaken as being rocks. And, because they are attached, “taking root” to the seafloor, they are often mistaken for plants. However, unlike rocks, corals are alive. And unlike plants, corals do not make their own food. Corals are in fact animals. Appearing as solitary forms in the fossil record more than 400 million years ago, corals are extremely ancient animals that evolved into modern reef-building forms over the last 25 million years.

Coral reefs are the largest structures on earth of biological origin. Coral reefs are unique and complex systems. Rivaling old growth forests in longevity of their ecological communities, well-developed reefs reflect thousands of years of history.

Corals are ancient animals related to jellyfish and anemones. The branch or mound that we often call “a coral” is actually made up of thousands of tiny animals called polyps. A coral polyp is an invertebrate that can be no bigger than a pinhead to up to 30 centimeters (1 foot) in diameter. The polyps extend their tentacles at night to sting and ingest tiny organisms called plankton and other small creatures. Each polyp has a saclike body and a mouth that is encircled by stinging tentacles. The polyp uses calcium carbonate (limestone) from seawater to build a hard, cup-shaped skeleton. This skeleton protects the soft, delicate body of the polyp.

Reefs only occur in shallow areas that are reachable by sunlight because of the relationship between coral and algae. Various types of microscopic algae, known as Symbiodinium, live inside of the coral, providing them with food and helping them to grow faster.

There are over 2,500 kinds (species) of corals. About 1,000 are the hard corals that build coral reefs. Other corals are soft corals. Soft corals have skeletons that are flexible and can bend with the water. The three main types of coral reefs are fringing reefs, barrier reefs, and coral atolls. The most common type of reef is the fringing reef. This type of reef grows seaward directly from the shore. They form borders along the shoreline and surrounding islands. When a fringing reef continues to grow upward from a volcanic island that has sunk entirely below sea level, an atoll is formed. Atolls are usually circular or oval in shape, with an open lagoon in the center. Any reef that is called a barrier reef gets its name because its presence protects the shallow waters along the shore from the open sea. That protection promotes the survival of many types of sea plant and animal life.

(Adapted from http://justfunfacts.com)

What does the word “They” in paragraph 5 refer to?

A. coral atolls

B. barrier reefs

C. fringing reefs

Đáp án chính xác

D. the shores

Trả lời:

verified Giải bởi Vietjack

Đáp án C

Xét về nghĩa và thông tin từ đoạn 5 “The three main types of coral reefs are fringing reefs, barrier reefs, and coral atolls. The most common type of reef is the fringing reef. This type of reef grows seaward directly from the shore. They form borders along the shoreline and surrounding islands.”

Dịch nghĩa:

“Đọc đoạn văn sau và đánh dấu chữ cái A, B, C hoặc D để chỉ ra câu trả lời cho mỗi câu hỏi

Các rạn san hô là một trong những hệ sinh thái đa dạng nhất trên thế giới, là nơi sinh sống của hàng chục nghìn loài sinh vật biển. Với bề mặt cứng của chúng, san hô đôi khi bị nhầm là đá. Và, vì bám chặt, “bám rễ” xuống đáy biển nên chúng thường bị nhầm là thực vật. Tuy nhiên, không giống như đá, san hô còn sống. Và không giống như thực vật, san hô không tự tạo ra thức ăn. San hô thực chất là động vật. Xuất hiện dưới dạng đơn độc trong hồ sơ hóa thạch hơn 400 triệu năm trước, san hô là loài động vật cực kỳ cổ xưa đã phát triển thành các dạng xây dựng rạn san hô hiện đại trong 25 triệu năm qua.

Các rạn san hô là cấu trúc lớn nhất trên trái đất có nguồn gốc sinh học. Các rạn san hô là hệ thống độc đáo và phức tạp. Cạnh tranh với các khu rừng già về tuổi thọ của cộng đồng sinh thái, các rạn san hô phát triển tốt phản ánh hàng nghìn năm lịch sử.

San hô là loài động vật cổ xưa có họ hàng với sứa và hải quỳ. Nhánh hay gò đất mà chúng ta thường gọi là “san hô” thực ra được tạo thành từ hàng ngàn động vật nhỏ bé gọi là polyp. Polyp san hô là một loài động vật không xương sống có thể không lớn hơn đầu kim và có đường kính lên tới 30 cm (1 foot). Các polyp mở rộng các xúc tu của chúng vào ban đêm để chích và ăn các sinh vật nhỏ gọi là sinh vật phù du và các sinh vật nhỏ khác. Mỗi polyp có thân hình túi và miệng được bao quanh bởi các xúc tu có cảm giác châm chích. Polyp sử dụng canxi cacbonat (đá vôi) từ nước biển để tạo nên bộ xương cứng hình cốc. Bộ xương này bảo vệ cơ thể mềm mại, mỏng manh của polyp.

Các rạn san hô chỉ xuất hiện ở những vùng nông có thể tiếp cận được bằng ánh sáng mặt trời do mối quan hệ giữa san hô và tảo. Nhiều loại tảo cực nhỏ, được gọi là Symbiodinium, sống bên trong san hô, cung cấp thức ăn cho chúng và giúp chúng phát triển nhanh hơn.

Có hơn 2.500 loại (loài) san hô. Khoảng 1.000 loài san hô cứng tạo nên các rạn san hô. San hô khác là san hô mềm. San hô mềm có bộ xương linh hoạt và có thể uốn cong theo nước. Ba loại rạn san hô chính là rạn san hô viền, rạn san hô rào cản và đảo san hô. Loại rạn san hô phổ biến nhất là rạn san hô viền. Loại rạn san hô này mọc trực tiếp từ bờ ra biển. Chúng tạo thành biên giới dọc theo bờ biển và các đảo xung quanh. Khi một rạn san hô viền tiếp tục mọc lên từ một hòn đảo núi lửa đã chìm hoàn toàn dưới mực nước biển, một đảo san hô sẽ được hình thành. Đảo san hô thường có hình tròn hoặc hình bầu dục, với một đầm phá mở ở trung tâm. Bất kỳ rạn san hô nào được gọi là rạn san hô rào cản đều có tên như vậy vì sự hiện diện của nó bảo vệ vùng nước nông dọc bờ biển khỏi biển khơi. Sự bảo vệ đó thúc đẩy sự tồn tại của nhiều loại thực vật và động vật biển.

(Chuyển thể từ http://justfunfacts.com)

Từ “Họ” trong đoạn 5 đề cập đến điều gì?

A. coral atolls (n): đảo san hô

B. barrier reefs (n): rạn san hô rào cản

C. fringing reefs (n): rạn san hô viền

D. the shores (n): bờ biển”

CÂU HỎI HOT CÙNG CHỦ ĐỀ

Câu 1:

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each the numbered blanks

The first thing that is included in the "living together” (26) ________ is the expected good relations with your family. This also involves sharing equally the housework. (27) ________of people think that everyone should share the housework equally, but in many homes parents do most of it. To certain minds, many families can't share the housework whereas they should try it. In fact, sharing the housework equally is not very possible because of the families' timetable. So, it is somehow believed that children and parents must do things together. For this they can establish a housework planning.

(28) ________, housework's contributions of the teenager make him more responsible. He will think that he has an important role in his family. According to researchers, teenagers should share the housework because (29) ________ will help them when they have to establish their own family in the future. Too many teenagers and young adults leave home without knowing how to cook or clean, but if parents delegate basic housework to teens as they are old enough to do it, they won't be destabilized by doing the housework in their new grown-up life.

It can be (30) ________concluded that many parents don't really prepare their children for future, because they don't stimulate them to learn how to run a house. If parents get them responsible, teens will be more responsible and that will improve family's life.

(Source: https://www.sciencedaily.com/releases/2013)

Điền vào ô 28

Xem đáp án » 31/07/2024 16,220

Câu 2:

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each the numbered blanks

The first thing that is included in the "living together” (26) ________ is the expected good relations with your family. This also involves sharing equally the housework. (27) ________of people think that everyone should share the housework equally, but in many homes parents do most of it. To certain minds, many families can't share the housework whereas they should try it. In fact, sharing the housework equally is not very possible because of the families' timetable. So, it is somehow believed that children and parents must do things together. For this they can establish a housework planning.

(28) ________, housework's contributions of the teenager make him more responsible. He will think that he has an important role in his family. According to researchers, teenagers should share the housework because (29) ________ will help them when they have to establish their own family in the future. Too many teenagers and young adults leave home without knowing how to cook or clean, but if parents delegate basic housework to teens as they are old enough to do it, they won't be destabilized by doing the housework in their new grown-up life.

It can be (30) ________concluded that many parents don't really prepare their children for future, because they don't stimulate them to learn how to run a house. If parents get them responsible, teens will be more responsible and that will improve family's life.

(Source: https://www.sciencedaily.com/releases/2013)

Điền vào ô 30

Xem đáp án » 23/07/2024 5,320

Câu 3:

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each the numbered blanks

The first thing that is included in the "living together” (26) ________ is the expected good relations with your family. This also involves sharing equally the housework. (27) ________of people think that everyone should share the housework equally, but in many homes parents do most of it. To certain minds, many families can't share the housework whereas they should try it. In fact, sharing the housework equally is not very possible because of the families' timetable. So, it is somehow believed that children and parents must do things together. For this they can establish a housework planning.

(28) ________, housework's contributions of the teenager make him more responsible. He will think that he has an important role in his family. According to researchers, teenagers should share the housework because (29) ________ will help them when they have to establish their own family in the future. Too many teenagers and young adults leave home without knowing how to cook or clean, but if parents delegate basic housework to teens as they are old enough to do it, they won't be destabilized by doing the housework in their new grown-up life.

It can be (30) ________concluded that many parents don't really prepare their children for future, because they don't stimulate them to learn how to run a house. If parents get them responsible, teens will be more responsible and that will improve family's life.

(Source: https://www.sciencedaily.com/releases/2013)

Điền vào ô 26

Xem đáp án » 22/07/2024 4,468

Câu 4:

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each the numbered blanks

The first thing that is included in the "living together” (26) ________ is the expected good relations with your family. This also involves sharing equally the housework. (27) ________of people think that everyone should share the housework equally, but in many homes parents do most of it. To certain minds, many families can't share the housework whereas they should try it. In fact, sharing the housework equally is not very possible because of the families' timetable. So, it is somehow believed that children and parents must do things together. For this they can establish a housework planning.

(28) ________, housework's contributions of the teenager make him more responsible. He will think that he has an important role in his family. According to researchers, teenagers should share the housework because (29) ________ will help them when they have to establish their own family in the future. Too many teenagers and young adults leave home without knowing how to cook or clean, but if parents delegate basic housework to teens as they are old enough to do it, they won't be destabilized by doing the housework in their new grown-up life.

It can be (30) ________concluded that many parents don't really prepare their children for future, because they don't stimulate them to learn how to run a house. If parents get them responsible, teens will be more responsible and that will improve family's life.

(Source: https://www.sciencedaily.com/releases/2013)

Điền vào ô 27

Xem đáp án » 22/07/2024 3,537

Câu 5:

Mark the letter A, B, C, or D to indicate the sentence that best completes each of the following exchanges

Nam and Lan are talking about the jobs which only men or women can do.

- Nam: “Do you think that there are any jobs which only men or only women can or should do?"

- Lan: “________”

Xem đáp án » 23/07/2024 1,319

Câu 6:

Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question

Coral reefs are some of the most diverse ecosystems in the world, housing tens of thousands of marine species. With their hardened surfaces, corals are sometimes mistaken as being rocks. And, because they are attached, “taking root” to the seafloor, they are often mistaken for plants. However, unlike rocks, corals are alive. And unlike plants, corals do not make their own food. Corals are in fact animals. Appearing as solitary forms in the fossil record more than 400 million years ago, corals are extremely ancient animals that evolved into modern reef-building forms over the last 25 million years.

Coral reefs are the largest structures on earth of biological origin. Coral reefs are unique and complex systems. Rivaling old growth forests in longevity of their ecological communities, well-developed reefs reflect thousands of years of history.

Corals are ancient animals related to jellyfish and anemones. The branch or mound that we often call “a coral” is actually made up of thousands of tiny animals called polyps. A coral polyp is an invertebrate that can be no bigger than a pinhead to up to 30 centimeters (1 foot) in diameter. The polyps extend their tentacles at night to sting and ingest tiny organisms called plankton and other small creatures. Each polyp has a saclike body and a mouth that is encircled by stinging tentacles. The polyp uses calcium carbonate (limestone) from seawater to build a hard, cup-shaped skeleton. This skeleton protects the soft, delicate body of the polyp.

Reefs only occur in shallow areas that are reachable by sunlight because of the relationship between coral and algae. Various types of microscopic algae, known as Symbiodinium, live inside of the coral, providing them with food and helping them to grow faster.

There are over 2,500 kinds (species) of corals. About 1,000 are the hard corals that build coral reefs. Other corals are soft corals. Soft corals have skeletons that are flexible and can bend with the water. The three main types of coral reefs are fringing reefs, barrier reefs, and coral atolls. The most common type of reef is the fringing reef. This type of reef grows seaward directly from the shore. They form borders along the shoreline and surrounding islands. When a fringing reef continues to grow upward from a volcanic island that has sunk entirely below sea level, an atoll is formed. Atolls are usually circular or oval in shape, with an open lagoon in the center. Any reef that is called a barrier reef gets its name because its presence protects the shallow waters along the shore from the open sea. That protection promotes the survival of many types of sea plant and animal life.

(Adapted from http://justfunfacts.com)

According to the passage, the following are true about coral reefs, EXCEPT ________.

Xem đáp án » 23/07/2024 1,257

Câu 7:

Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question

Vietnam’s population is ageing quickly. In 2017, more than 10 per cent of the population will be 60 and older, and in 15-20 years the elderly will account for one third of the total population. This raises concerns about healthcare, welfare and pensions for the elderly at a time when Vietnam is focusing on economic integration and requires a large labor force. So far two solutions have been proposed: to loosen the two-child policy and to increase the retirement age to 58 for women and 62 for men. By ending the two-child policy the government expects to make up for the ageing population within the next 20 years. But its effect could be creating an uncontrollable boom in the Vietnamese population. When the government loosened the two-child policy in 2015 in a trial period, in the first 6 months of 2016 the third child birth rate increased remarkably by 7.5 per cent

Raising the retirement age has been proposed by the Ministry of Labor pending parliamentary evaluation in May 2017. While the policy is beneficial in utilizing the work experience of the elderly while creating savings in the pension budget, it also means fewer job prospects and promotion opportunities for younger generations. It is also not in the interest of all the elderly, especially the 70 per cent of Vietnam's labor force working in manual labor-intensive sectors such as agriculture, manufacturing and construction where working above the age of 50 can be dangerous and unproductive. Despite these drawbacks, raising the retirement age is still considered by policymakers as one of the key solutions to the ageing population problem in Vietnam. However, these are only temporary solutions.

Which statement is probably TRUE according to the information in the paragraph 1?

Xem đáp án » 22/07/2024 731

Câu 8:

Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question

Coral reefs are some of the most diverse ecosystems in the world, housing tens of thousands of marine species. With their hardened surfaces, corals are sometimes mistaken as being rocks. And, because they are attached, “taking root” to the seafloor, they are often mistaken for plants. However, unlike rocks, corals are alive. And unlike plants, corals do not make their own food. Corals are in fact animals. Appearing as solitary forms in the fossil record more than 400 million years ago, corals are extremely ancient animals that evolved into modern reef-building forms over the last 25 million years.

Coral reefs are the largest structures on earth of biological origin. Coral reefs are unique and complex systems. Rivaling old growth forests in longevity of their ecological communities, well-developed reefs reflect thousands of years of history.

Corals are ancient animals related to jellyfish and anemones. The branch or mound that we often call “a coral” is actually made up of thousands of tiny animals called polyps. A coral polyp is an invertebrate that can be no bigger than a pinhead to up to 30 centimeters (1 foot) in diameter. The polyps extend their tentacles at night to sting and ingest tiny organisms called plankton and other small creatures. Each polyp has a saclike body and a mouth that is encircled by stinging tentacles. The polyp uses calcium carbonate (limestone) from seawater to build a hard, cup-shaped skeleton. This skeleton protects the soft, delicate body of the polyp.

Reefs only occur in shallow areas that are reachable by sunlight because of the relationship between coral and algae. Various types of microscopic algae, known as Symbiodinium, live inside of the coral, providing them with food and helping them to grow faster.

There are over 2,500 kinds (species) of corals. About 1,000 are the hard corals that build coral reefs. Other corals are soft corals. Soft corals have skeletons that are flexible and can bend with the water. The three main types of coral reefs are fringing reefs, barrier reefs, and coral atolls. The most common type of reef is the fringing reef. This type of reef grows seaward directly from the shore. They form borders along the shoreline and surrounding islands. When a fringing reef continues to grow upward from a volcanic island that has sunk entirely below sea level, an atoll is formed. Atolls are usually circular or oval in shape, with an open lagoon in the center. Any reef that is called a barrier reef gets its name because its presence protects the shallow waters along the shore from the open sea. That protection promotes the survival of many types of sea plant and animal life.

(Adapted from http://justfunfacts.com)

As mentioned in the last paragraph, why a reef is called a barrier reef?

Xem đáp án » 20/07/2024 654

Câu 9:

Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question

Coral reefs are some of the most diverse ecosystems in the world, housing tens of thousands of marine species. With their hardened surfaces, corals are sometimes mistaken as being rocks. And, because they are attached, “taking root” to the seafloor, they are often mistaken for plants. However, unlike rocks, corals are alive. And unlike plants, corals do not make their own food. Corals are in fact animals. Appearing as solitary forms in the fossil record more than 400 million years ago, corals are extremely ancient animals that evolved into modern reef-building forms over the last 25 million years.

Coral reefs are the largest structures on earth of biological origin. Coral reefs are unique and complex systems. Rivaling old growth forests in longevity of their ecological communities, well-developed reefs reflect thousands of years of history.

Corals are ancient animals related to jellyfish and anemones. The branch or mound that we often call “a coral” is actually made up of thousands of tiny animals called polyps. A coral polyp is an invertebrate that can be no bigger than a pinhead to up to 30 centimeters (1 foot) in diameter. The polyps extend their tentacles at night to sting and ingest tiny organisms called plankton and other small creatures. Each polyp has a saclike body and a mouth that is encircled by stinging tentacles. The polyp uses calcium carbonate (limestone) from seawater to build a hard, cup-shaped skeleton. This skeleton protects the soft, delicate body of the polyp.

Reefs only occur in shallow areas that are reachable by sunlight because of the relationship between coral and algae. Various types of microscopic algae, known as Symbiodinium, live inside of the coral, providing them with food and helping them to grow faster.

There are over 2,500 kinds (species) of corals. About 1,000 are the hard corals that build coral reefs. Other corals are soft corals. Soft corals have skeletons that are flexible and can bend with the water. The three main types of coral reefs are fringing reefs, barrier reefs, and coral atolls. The most common type of reef is the fringing reef. This type of reef grows seaward directly from the shore. They form borders along the shoreline and surrounding islands. When a fringing reef continues to grow upward from a volcanic island that has sunk entirely below sea level, an atoll is formed. Atolls are usually circular or oval in shape, with an open lagoon in the center. Any reef that is called a barrier reef gets its name because its presence protects the shallow waters along the shore from the open sea. That protection promotes the survival of many types of sea plant and animal life.

(Adapted from http://justfunfacts.com)

The word “Rivaling” in paragraph 2 is closest in meaning to ________.

Xem đáp án » 22/07/2024 620

Câu 10:

Mark the letter A, B, C or D to indicate the correct answer to each of the following questions

______ in large quantities in the Middle East, oil became known as black gold because of the large profit it brought

Xem đáp án » 22/07/2024 614

Câu 11:

Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question

Vietnam’s population is ageing quickly. In 2017, more than 10 per cent of the population will be 60 and older, and in 15-20 years the elderly will account for one third of the total population. This raises concerns about healthcare, welfare and pensions for the elderly at a time when Vietnam is focusing on economic integration and requires a large labor force. So far two solutions have been proposed: to loosen the two-child policy and to increase the retirement age to 58 for women and 62 for men. By ending the two-child policy the government expects to make up for the ageing population within the next 20 years. But its effect could be creating an uncontrollable boom in the Vietnamese population. When the government loosened the two-child policy in 2015 in a trial period, in the first 6 months of 2016 the third child birth rate increased remarkably by 7.5 per cent

Raising the retirement age has been proposed by the Ministry of Labor pending parliamentary evaluation in May 2017. While the policy is beneficial in utilizing the work experience of the elderly while creating savings in the pension budget, it also means fewer job prospects and promotion opportunities for younger generations. It is also not in the interest of all the elderly, especially the 70 per cent of Vietnam's labor force working in manual labor-intensive sectors such as agriculture, manufacturing and construction where working above the age of 50 can be dangerous and unproductive. Despite these drawbacks, raising the retirement age is still considered by policymakers as one of the key solutions to the ageing population problem in Vietnam. However, these are only temporary solutions.

In the 2rd paragraph, the writer suggests that ________.

Xem đáp án » 23/07/2024 579

Câu 12:

Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question

Vietnam’s population is ageing quickly. In 2017, more than 10 per cent of the population will be 60 and older, and in 15-20 years the elderly will account for one third of the total population. This raises concerns about healthcare, welfare and pensions for the elderly at a time when Vietnam is focusing on economic integration and requires a large labor force. So far two solutions have been proposed: to loosen the two-child policy and to increase the retirement age to 58 for women and 62 for men. By ending the two-child policy the government expects to make up for the ageing population within the next 20 years. But its effect could be creating an uncontrollable boom in the Vietnamese population. When the government loosened the two-child policy in 2015 in a trial period, in the first 6 months of 2016 the third child birth rate increased remarkably by 7.5 per cent

Raising the retirement age has been proposed by the Ministry of Labor pending parliamentary evaluation in May 2017. While the policy is beneficial in utilizing the work experience of the elderly while creating savings in the pension budget, it also means fewer job prospects and promotion opportunities for younger generations. It is also not in the interest of all the elderly, especially the 70 per cent of Vietnam's labor force working in manual labor-intensive sectors such as agriculture, manufacturing and construction where working above the age of 50 can be dangerous and unproductive. Despite these drawbacks, raising the retirement age is still considered by policymakers as one of the key solutions to the ageing population problem in Vietnam. However, these are only temporary solutions.

The best title for this passage could be ________.

Xem đáp án » 21/07/2024 553

Câu 13:

Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question

Coral reefs are some of the most diverse ecosystems in the world, housing tens of thousands of marine species. With their hardened surfaces, corals are sometimes mistaken as being rocks. And, because they are attached, “taking root” to the seafloor, they are often mistaken for plants. However, unlike rocks, corals are alive. And unlike plants, corals do not make their own food. Corals are in fact animals. Appearing as solitary forms in the fossil record more than 400 million years ago, corals are extremely ancient animals that evolved into modern reef-building forms over the last 25 million years.

Coral reefs are the largest structures on earth of biological origin. Coral reefs are unique and complex systems. Rivaling old growth forests in longevity of their ecological communities, well-developed reefs reflect thousands of years of history.

Corals are ancient animals related to jellyfish and anemones. The branch or mound that we often call “a coral” is actually made up of thousands of tiny animals called polyps. A coral polyp is an invertebrate that can be no bigger than a pinhead to up to 30 centimeters (1 foot) in diameter. The polyps extend their tentacles at night to sting and ingest tiny organisms called plankton and other small creatures. Each polyp has a saclike body and a mouth that is encircled by stinging tentacles. The polyp uses calcium carbonate (limestone) from seawater to build a hard, cup-shaped skeleton. This skeleton protects the soft, delicate body of the polyp.

Reefs only occur in shallow areas that are reachable by sunlight because of the relationship between coral and algae. Various types of microscopic algae, known as Symbiodinium, live inside of the coral, providing them with food and helping them to grow faster.

There are over 2,500 kinds (species) of corals. About 1,000 are the hard corals that build coral reefs. Other corals are soft corals. Soft corals have skeletons that are flexible and can bend with the water. The three main types of coral reefs are fringing reefs, barrier reefs, and coral atolls. The most common type of reef is the fringing reef. This type of reef grows seaward directly from the shore. They form borders along the shoreline and surrounding islands. When a fringing reef continues to grow upward from a volcanic island that has sunk entirely below sea level, an atoll is formed. Atolls are usually circular or oval in shape, with an open lagoon in the center. Any reef that is called a barrier reef gets its name because its presence protects the shallow waters along the shore from the open sea. That protection promotes the survival of many types of sea plant and animal life.

(Adapted from http://justfunfacts.com)

With the help of myriad species of tiny algae, reefs ________.

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Câu 14:

Mark the letter A, B, C, or D to indicate the sentence that best completes each of the following exchanges

Mary is talking to her professor in his office.

- Mary: “Can you tell me how to find material for my science report, professor?”

- Professor: “________”

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Câu 15:

Mark the letter A, B, C or D to indicate the correct answer to each of the following questions

It is claimed that new nuclear power plants designed to be safer than the current ones______.

Xem đáp án » 22/07/2024 435

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