Trang chủ Lớp 12 Tiếng Anh (mới) Đề thi Tiếng anh 12 giữa kì 2 có đáp án

Đề thi Tiếng anh 12 giữa kì 2 có đáp án

Đề thi Tiếng anh 12 giữa kì 2 có đáp án (đề 5)

  • 1918 lượt thi

  • 35 câu hỏi

  • 45 phút

Danh sách câu hỏi

Câu 1:

16/07/2024

Ann: “Passing a university entrance exam is not difficult.” - John: “_____.”

Xem đáp án

Đáp án đúng: D

Giải thích: Dựa vào nghĩa của câu.

Dịch: Ann: "Vượt qua một kỳ thi tuyển sinh đại học không khó."


Câu 2:

16/07/2024

Mary: “Our team has just won that English Competition.” - Anne: “_____”

Xem đáp án

Đáp án đúng: B

Giải thích: Dựa vào ý nghĩa của câu.

Dịch: Mary: “Nhóm của chúng tôi vừa giành chiến thắng trong Cuộc thi Tiếng Anh đó.” -

Anne: Chà, bất ngờ quá.


Câu 3:

22/07/2024

Facebook is a for-profit online social media and social networking service. The Facebook website was launched on February 4th, 2004 by Mark Zuckerberg, along with fellow Harvard College students and roommates. Since 2006, anyone age 13 and older has been allowed to become a registered user of Facebook though variations exist in minimum age requirement, depending on applicable local laws.

Over 25 million people in the Uk use Facebook. That’s 45% of population! And on average, each user spends over six hours a month on Facebook. Though not the highest this is a considerable number. Is Facebook is a dangerous obsession or just harmless fun? Seventeen- year-old Bethan has written on her blog about what it was like to stop using Facebook.

I think I am a Facebook addict. I log on to Facebook everyday to chat to my friends real friends and loads of online friends. Sometimes I have ten conversations going at the same time. I upload photos and update my Facebook profile all the time. But recently I’ve started to feel worried if I am offline for more than a few hours. And then last week I forgot to meet a real friend because I was online! I’ve realized I could have a problem. So I’ve decided to give it up for a while.

I found it really hard. Facebook and my friends demanded to know why I had left. I spent the first few evenings wondering what everyone was chatting on Facebook. I even phoned a couple of friends to find out.

The fourth night I wasn’t quite so bad. I actually concentrated on my homework better and I had more time to watch my TV programmes. And I spoke to my friends during the day at school. At the end of the first week, I reactivated my account. I think Facebook is fun and it’s useful for posting messages to friends and sharing photos. But I’ll try not to spend so much time on it in the future.

Which of the following is NOT true about Facebook users in the UK?

Xem đáp án

Đáp án đúng: C

Giải thích: Dựa vào câuThough not the highest this is a considerable number.”

Dịch: Mặc dù không phải là cao nhất nhưng đây là một con số đáng kể.


Câu 4:

23/07/2024

Facebook is a for-profit online social media and social networking service. The Facebook website was launched on February 4th, 2004 by Mark Zuckerberg, along with fellow Harvard College students and roommates. Since 2006, anyone age 13 and older has been allowed to become a registered user of Facebook though variations exist in minimum age requirement, depending on applicable local laws.

Over 25 million people in the Uk use Facebook. That’s 45% of population! And on average, each user spends over six hours a month on Facebook. Though not the highest this is a considerable number. Is Facebook is a dangerous obsession or just harmless fun? Seventeen- year-old Bethan has written on her blog about what it was like to stop using Facebook.

I think I am a Facebook addict. I log on to Facebook everyday to chat to my friends real friends and loads of online friends. Sometimes I have ten conversations going at the same time. I upload photos and update my Facebook profile all the time. But recently I’ve started to feel worried if I am offline for more than a few hours. And then last week I forgot to meet a real friend because I was online! I’ve realized I could have a problem. So I’ve decided to give it up for a while.

I found it really hard. Facebook and my friends demanded to know why I had left. I spent the first few evenings wondering what everyone was chatting on Facebook. I even phoned a couple of friends to find out.

The fourth night I wasn’t quite so bad. I actually concentrated on my homework better and I had more time to watch my TV programmes. And I spoke to my friends during the day at school. At the end of the first week, I reactivated my account. I think Facebook is fun and it’s useful for posting messages to friends and sharing photos. But I’ll try not to spend so much time on it in the future.

The highlight word “it” in the passage refers to_____.

Xem đáp án

Đáp án đúng: B

Giải thích: Dựa vào câu “I think I am a Facebook addict.”

Dịch: Tôi nghĩ rằng tôi là một người nghiện Facebook.


Câu 5:

17/07/2024

Facebook is a for-profit online social media and social networking service. The Facebook website was launched on February 4th, 2004 by Mark Zuckerberg, along with fellow Harvard College students and roommates. Since 2006, anyone age 13 and older has been allowed to become a registered user of Facebook though variations exist in minimum age requirement, depending on applicable local laws.

Over 25 million people in the Uk use Facebook. That’s 45% of population! And on average, each user spends over six hours a month on Facebook. Though not the highest this is a considerable number. Is Facebook is a dangerous obsession or just harmless fun? Seventeen- year-old Bethan has written on her blog about what it was like to stop using Facebook.

I think I am a Facebook addict. I log on to Facebook everyday to chat to my friends real friends and loads of online friends. Sometimes I have ten conversations going at the same time. I upload photos and update my Facebook profile all the time. But recently I’ve started to feel worried if I am offline for more than a few hours. And then last week I forgot to meet a real friend because I was online! I’ve realized I could have a problem. So I’ve decided to give it up for a while.

I found it really hard. Facebook and my friends demanded to know why I had left. I spent the first few evenings wondering what everyone was chatting on Facebook. I even phoned a couple of friends to find out.

The fourth night I wasn’t quite so bad. I actually concentrated on my homework better and I had more time to watch my TV programmes. And I spoke to my friends during the day at school. At the end of the first week, I reactivated my account. I think Facebook is fun and it’s useful for posting messages to friends and sharing photos. But I’ll try not to spend so much time on it in the future.

Facebook _______.

Xem đáp án

Đáp án đúng: C

Giải thích: Dựa vào câu “Since 2006, anyone age 13 and older has been allowed to become a registered user of Facebook though variations exist in minimum age requirement, depending on applicable local laws.”

Dịch: Kể từ năm 2006, bất kỳ ai từ 13 tuổi trở lên đều được phép trở thành người dùng của Facebook mặc dù có nhiều khác biệt về yêu cầu độ tuổi tối thiểu, tùy thuộc vào luật địa phương hiện hành.


Câu 6:

23/07/2024

Facebook is a for-profit online social media and social networking service. The Facebook website was launched on February 4th, 2004 by Mark Zuckerberg, along with fellow Harvard College students and roommates. Since 2006, anyone age 13 and older has been allowed to become a registered user of Facebook though variations exist in minimum age requirement, depending on applicable local laws.

Over 25 million people in the Uk use Facebook. That’s 45% of population! And on average, each user spends over six hours a month on Facebook. Though not the highest this is a considerable number. Is Facebook is a dangerous obsession or just harmless fun? Seventeen- year-old Bethan has written on her blog about what it was like to stop using Facebook.

I think I am a Facebook addict. I log on to Facebook everyday to chat to my friends real friends and loads of online friends. Sometimes I have ten conversations going at the same time. I upload photos and update my Facebook profile all the time. But recently I’ve started to feel worried if I am offline for more than a few hours. And then last week I forgot to meet a real friend because I was online! I’ve realized I could have a problem. So I’ve decided to give it up for a while.

I found it really hard. Facebook and my friends demanded to know why I had left. I spent the first few evenings wondering what everyone was chatting on Facebook. I even phoned a couple of friends to find out.

The fourth night I wasn’t quite so bad. I actually concentrated on my homework better and I had more time to watch my TV programmes. And I spoke to my friends during the day at school. At the end of the first week, I reactivated my account. I think Facebook is fun and it’s useful for posting messages to friends and sharing photos. But I’ll try not to spend so much time on it in the future.

Which of the following is NOT the thing Bethan does as a Facebook addict?

Xem đáp án

Đáp án đúng: D

Giải thích: Dựa vào phương pháp loại trừ.

Dịch: không sử dụng mạng xã hội gần như mọi lúc.


Câu 7:

20/07/2024

Facebook is a for-profit online social media and social networking service. The Facebook website was launched on February 4th, 2004 by Mark Zuckerberg, along with fellow Harvard College students and roommates. Since 2006, anyone age 13 and older has been allowed to become a registered user of Facebook though variations exist in minimum age requirement, depending on applicable local laws.

Over 25 million people in the Uk use Facebook. That’s 45% of population! And on average, each user spends over six hours a month on Facebook. Though not the highest this is a considerable number. Is Facebook is a dangerous obsession or just harmless fun? Seventeen- year-old Bethan has written on her blog about what it was like to stop using Facebook.

I think I am a Facebook addict. I log on to Facebook everyday to chat to my friends real friends and loads of online friends. Sometimes I have ten conversations going at the same time. I upload photos and update my Facebook profile all the time. But recently I’ve started to feel worried if I am offline for more than a few hours. And then last week I forgot to meet a real friend because I was online! I’ve realized I could have a problem. So I’ve decided to give it up for a while.

I found it really hard. Facebook and my friends demanded to know why I had left. I spent the first few evenings wondering what everyone was chatting on Facebook. I even phoned a couple of friends to find out.

The fourth night I wasn’t quite so bad. I actually concentrated on my homework better and I had more time to watch my TV programmes. And I spoke to my friends during the day at school. At the end of the first week, I reactivated my account. I think Facebook is fun and it’s useful for posting messages to friends and sharing photos. But I’ll try not to spend so much time on it in the future.

The word “applicable” in paragraph 1 is closest in meaning to_____.

Xem đáp án

Đáp án đúng: C

Giải thích: applicable = relevant: Hiện hành

Dịch: tùy thuộc vào luật hiện hành của địa phương.


Câu 8:

22/07/2024

Facebook is a for-profit online social media and social networking service. The Facebook website was launched on February 4th, 2004 by Mark Zuckerberg, along with fellow Harvard College students and roommates. Since 2006, anyone age 13 and older has been allowed to become a registered user of Facebook though variations exist in minimum age requirement, depending on applicable local laws.

Over 25 million people in the Uk use Facebook. That’s 45% of population! And on average, each user spends over six hours a month on Facebook. Though not the highest this is a considerable number. Is Facebook is a dangerous obsession or just harmless fun? Seventeen- year-old Bethan has written on her blog about what it was like to stop using Facebook.

I think I am a Facebook addict. I log on to Facebook everyday to chat to my friends real friends and loads of online friends. Sometimes I have ten conversations going at the same time. I upload photos and update my Facebook profile all the time. But recently I’ve started to feel worried if I am offline for more than a few hours. And then last week I forgot to meet a real friend because I was online! I’ve realized I could have a problem. So I’ve decided to give it up for a while.

I found it really hard. Facebook and my friends demanded to know why I had left. I spent the first few evenings wondering what everyone was chatting on Facebook. I even phoned a couple of friends to find out.

The fourth night I wasn’t quite so bad. I actually concentrated on my homework better and I had more time to watch my TV programmes. And I spoke to my friends during the day at school. At the end of the first week, I reactivated my account. I think Facebook is fun and it’s useful for posting messages to friends and sharing photos. But I’ll try not to spend so much time on it in the future.

What does Bethan conclude about Facebook?

Xem đáp án

Đáp án đúng: D

Giải thích: Dựa vào câu I think Facebook is fun and it’s useful for posting messages to friends and sharing photos. But I’ll try not to spend so much time on it in the future”

Dịch: Tôi nghĩ Facebook rất thú vị và rất hữu ích khi đăng tin nhắn cho bạn bè và chia sẻ ảnh. Nhưng tôi sẽ cố gắng không dành quá nhiều thời gian cho nó trong tương lai.


Câu 9:

19/07/2024

Facebook is a for-profit online social media and social networking service. The Facebook website was launched on February 4th, 2004 by Mark Zuckerberg, along with fellow Harvard College students and roommates. Since 2006, anyone age 13 and older has been allowed to become a registered user of Facebook though variations exist in minimum age requirement, depending on applicable local laws.

Over 25 million people in the Uk use Facebook. That’s 45% of population! And on average, each user spends over six hours a month on Facebook. Though not the highest this is a considerable number. Is Facebook is a dangerous obsession or just harmless fun? Seventeen- year-old Bethan has written on her blog about what it was like to stop using Facebook.

I think I am a Facebook addict. I log on to Facebook everyday to chat to my friends real friends and loads of online friends. Sometimes I have ten conversations going at the same time. I upload photos and update my Facebook profile all the time. But recently I’ve started to feel worried if I am offline for more than a few hours. And then last week I forgot to meet a real friend because I was online! I’ve realized I could have a problem. So I’ve decided to give it up for a while.

I found it really hard. Facebook and my friends demanded to know why I had left. I spent the first few evenings wondering what everyone was chatting on Facebook. I even phoned a couple of friends to find out.

The fourth night I wasn’t quite so bad. I actually concentrated on my homework better and I had more time to watch my TV programmes. And I spoke to my friends during the day at school. At the end of the first week, I reactivated my account. I think Facebook is fun and it’s useful for posting messages to friends and sharing photos. But I’ll try not to spend so much time on it in the future.

What happened to make Bethan decide to quit Facebook for a while?

Xem đáp án

Đáp án đúng: A

Giải thích: Dựa vào câu “And then last week I forgot to meet a real friend because I was online! I’ve realized I could have a problem”

Dịch: Và rồi tuần trước tôi đã quên gặp một người bạn thực sự vì tôi mải online! Tôi đã nhận ra rằng tôi có thể gặp vấn đề.


Câu 10:

17/07/2024

Facebook is a for-profit online social media and social networking service. The Facebook website was launched on February 4th, 2004 by Mark Zuckerberg, along with fellow Harvard College students and roommates. Since 2006, anyone age 13 and older has been allowed to become a registered user of Facebook though variations exist in minimum age requirement, depending on applicable local laws.

Over 25 million people in the Uk use Facebook. That’s 45% of population! And on average, each user spends over six hours a month on Facebook. Though not the highest this is a considerable number. Is Facebook is a dangerous obsession or just harmless fun? Seventeen- year-old Bethan has written on her blog about what it was like to stop using Facebook.

I think I am a Facebook addict. I log on to Facebook everyday to chat to my friends real friends and loads of online friends. Sometimes I have ten conversations going at the same time. I upload photos and update my Facebook profile all the time. But recently I’ve started to feel worried if I am offline for more than a few hours. And then last week I forgot to meet a real friend because I was online! I’ve realized I could have a problem. So I’ve decided to give it up for a while.

I found it really hard. Facebook and my friends demanded to know why I had left. I spent the first few evenings wondering what everyone was chatting on Facebook. I even phoned a couple of friends to find out.

The fourth night I wasn’t quite so bad. I actually concentrated on my homework better and I had more time to watch my TV programmes. And I spoke to my friends during the day at school. At the end of the first week, I reactivated my account. I think Facebook is fun and it’s useful for posting messages to friends and sharing photos. But I’ll try not to spend so much time on it in the future.

When she decided to give up Facebook_____.

Xem đáp án

Đáp án đúng: C

Giải thích: Dựa vào câu “The fourth night I wasn’t quite so bad.”

Dịch: Đêm thứ tư, tôi cảm thấy không quá tệ.


Câu 11:

22/07/2024

Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the three in the position of primary stress in each of the following questions.

Xem đáp án

Đáp án đúng: C

Giải thích: Đáp án rơi vào trọng âm thứ hai, ba đáp án còn lại rơi vào trọng âm thứ nhất.


Câu 12:

16/07/2024

Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the three in the position of primary stress in each of the following questions.

Xem đáp án

Đáp án đúng: C

Giải thích: Đáp án rơi vào trọng âm thứ ba, ba đáp án còn lại


Câu 13:

16/07/2024

“You stole my best cassette, Bob.” said Willy.

Xem đáp án

Đáp án đúng: D

Giải thích: accuse of:  đổ lỗi

Dịch: Willy buộc tội Bob ăn cắp chiếc băng cassette yêu thích nhất của anh ấy.


Câu 14:

17/07/2024

If you don’t have his number, you can’t phone him.

Xem đáp án

Đáp án đúng: B

Giải thích: Cấu trúc câu điều kiện loại 1

Dịch: Bạn không thể gọi cho anh ấy trừ khi bạn có số của anh ấy.


Câu 15:

23/07/2024

There are many things I want for Christmas. Some are clothes, toys and money

Xem đáp án

Đáp án đúng: D

Giải thích: include: bao gồm.

Dịch: Có rất nhiều thứ tôi muốn cho Giáng sinh, bao gồm quần áo, đồ chơi và tiền bạc.


Câu 16:

17/07/2024

Tom and May never help at home. The reason is because their mother never asks to

Xem đáp án

Đáp án đúng: B

Giải thích: Dựa vào nghĩa của câu.

Dịch: Tom và May không bao giờ giúp việc nhà vì mẹ của họ không bao giờ yêu cầu.


Câu 17:

23/07/2024

Mr Pike is repairing the refrigerator in the kitchen at the moment.

Xem đáp án

Đáp án đúng: C

Giải thích: Dựa vào cấu trúc câu bị động thì hiện tại đơn: S + be + V3 (+ by Sb/ O).

Dịch: Hiện tại tủ lạnh đang được Mr Pike sửa chữa trong bếp.


Câu 18:

17/07/2024

Mark the letter A, B, C, D on your answer sheet to indicate the word whose underlined part differs from that of the other three in pronunciation in each of the following questions:

Xem đáp án

Đáp án đúng: A

Giải thích: Đáp án A đọc là / ɜ/ còn các đáp án còn lại đọc là /ju/


Câu 19:

16/07/2024

Mark the letter A, B, C, D on your answer sheet to indicate the word whose underlined part differs from that of the other three in pronunciation in each of the following questions:

Xem đáp án

Đáp án đúng: C

Giải thích: Đáp án C phát âm là /d/, các đáp án còn lại đọc là /t/


Câu 20:

17/07/2024

A lot of rice were exported to France last year.

Xem đáp án

Đáp án đúng: A

Giải thích: Rice là danh từ không đếm được, phải chia theo số ít

Dịch: Rất nhiều gạo đã được xuất khẩu sang Pháp trong năm ngoái.


Câu 21:

20/07/2024

If you think carefully before making your decision, you will avoid to get into trouble later

Xem đáp án

Đáp án đúng: A

Giải thích: avoid + V-ing

Dịch: Nếu bạn suy nghĩ cẩn thận trước khi đưa ra quyết định, bạn sẽ tránh được những rắc rối sau này.


Câu 22:

19/07/2024

The books writing by Mark Twain are very popular in the world.

Xem đáp án

Đáp án đúng: D

Giải thích: quy tắc rút gọn mệnh đề.

Dịch: Những cuốn sách do Mark Twain viết rất nổi tiếng trên thế giới.


Câu 23:

16/07/2024

The teacher gave some suggestions on what would come out for the examination

Xem đáp án

Đáp án đúng: D

Giải thích: suggestion = hint: gợi ý

Dịch: Giáo viên đã đưa ra một số gợi ý về những gì sẽ xuất hiện trong bài kiểm tra.


Câu 24:

16/07/2024

When being interviewed, you should concentrate on what the interviewer is saying or asking you

Xem đáp án

Đáp án đúng: D

Giải thích: concentrate = pay attention to: để ý, tập trung

Dịch: Khi được phỏng vấn, bạn nên tập trung vào những gì người phỏng vấn đang nói hoặc hỏi bạn.


Câu 25:

22/07/2024

Mark the letter A, B, C or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.

A chronic lack of sleep may make us irritable and reduce our motivation to work

Xem đáp án

Đáp án đúng: A

Giải thích: irritable: thiếu kiên nhẫn>< calm: bình tĩnh

Dịch: Thiếu ngủ kinh niên có thể khiến chúng ta cáu kỉnh và giảm động lực làm việc.


Câu 26:

22/07/2024

Mark the letter A, B, C or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.

He had never experienced such discourtesy towards the president as it occurred at annual meeting in May

Xem đáp án

Đáp án đúng: D

Giải thích: discourtesy: bất lịch sự >< politeness: sự lịch sự.

Dịch: Anh ta chưa bao giờ cảm thấy khó chịu như vậy đối với tổng thống trước khi xảy ra cuộc họp thường niên vào tháng Năm.


Câu 32:

16/07/2024

It’s a sound you will probably never hear, a sickened tree sending out a distress signal. But a group of scientists has heard the cries, and they think some insects also hear the trees and are drawn to them like vulture to a dying animal. Researchers with the US Department of Agriculture’s Forest Service fastened sensors to the bark of drought-stricken trees clearly heard distress calls. According to one of the scientists, most parched trees transmit their plight in the 50-hertz to 50kilohertz range. (The unaided human ear can detect no more than 20 kilohertz). Red oak, maple, white pine, and birch all make slightly different sounds in the form of vibrations at the surface of the wood.

The scientists think that the vibrations are created when the water columns inside tubes that run along the length of the tree break, a result of too little water following through them.

These fractured columns send out distinctive vibration patterns. Because some insects communicate at ultrasonic frequencies, they may pick up the trees' vibration and attack the weakened trees. Researchers are now running tests with potted trees that have been deprived of water to see if the sound is what attracts the insects. “Water-stressed trees also smell differently from other trees, and they experience thermal changes, so insects could be responding to something other than sound”, one scientist said.

All the following are mentioned as possible factors in drawing insects to weakened trees EXCEPT______.

Xem đáp án

Đáp án đúng: C

Giải thích: Dựa vào các ý được đưa ra trong bài.

Dịch: thay đổi màu sắc


Câu 33:

22/07/2024

It’s a sound you will probably never hear, a sickened tree sending out a distress signal. But a group of scientists has heard the cries, and they think some insects also hear the trees and are drawn to them like vulture to a dying animal. Researchers with the US Department of Agriculture’s Forest Service fastened sensors to the bark of drought-stricken trees clearly heard distress calls. According to one of the scientists, most parched trees transmit their plight in the 50-hertz to 50kilohertz range. (The unaided human ear can detect no more than 20 kilohertz). Red oak, maple, white pine, and birch all make slightly different sounds in the form of vibrations at the surface of the wood.

The scientists think that the vibrations are created when the water columns inside tubes that run along the length of the tree break, a result of too little water following through them.

These fractured columns send out distinctive vibration patterns. Because some insects communicate at ultrasonic frequencies, they may pick up the trees' vibration and attack the weakened trees. Researchers are now running tests with potted trees that have been deprived of water to see if the sound is what attracts the insects. “Water-stressed trees also smell differently from other trees, and they experience thermal changes, so insects could be responding to something other than sound”, one scientist said.

It can be inferred from the passage that research concerning the distress signals of trees______.

Xem đáp án

Đáp án đúng: D

Giải thích: Dựa vào các nghiên cứu được đề ra trong bài.

Dịch: Có thể suy ra từ đoạn văn rằng nghiên cứu liên quan đến các tín hiệu gặp nạn của cây cối đang được tiếp tục.


Câu 34:

20/07/2024

It’s a sound you will probably never hear, a sickened tree sending out a distress signal. But a group of scientists has heard the cries, and they think some insects also hear the trees and are drawn to them like vulture to a dying animal. Researchers with the US Department of Agriculture’s Forest Service fastened sensors to the bark of drought-stricken trees clearly heard distress calls. According to one of the scientists, most parched trees transmit their plight in the 50-hertz to 50kilohertz range. (The unaided human ear can detect no more than 20 kilohertz). Red oak, maple, white pine, and birch all make slightly different sounds in the form of vibrations at the surface of the wood.

The scientists think that the vibrations are created when the water columns inside tubes that run along the length of the tree break, a result of too little water following through them.

These fractured columns send out distinctive vibration patterns. Because some insects communicate at ultrasonic frequencies, they may pick up the trees' vibration and attack the weakened trees. Researchers are now running tests with potted trees that have been deprived of water to see if the sound is what attracts the insects. “Water-stressed trees also smell differently from other trees, and they experience thermal changes, so insects could be responding to something other than sound”, one scientist said.

Which of the following could be considered a cause of the distress signals of trees?

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Đáp án đúng: D

Giải thích: Dựa vào câu “The scientists think that the vibrations are created when the water columns inside tubes that run along the length of the tree break, a result of too little water following through them.”

Dịch: Các nhà khoa học cho rằng sự rung chuyển được tạo ra khi các cột nước bên trong các ống chạy dọc theo chiều dài của cây bị vỡ, do có quá ít nước trong cây.


Câu 35:

16/07/2024

It’s a sound you will probably never hear, a sickened tree sending out a distress signal. But a group of scientists has heard the cries, and they think some insects also hear the trees and are drawn to them like vulture to a dying animal. Researchers with the US Department of Agriculture’s Forest Service fastened sensors to the bark of drought-stricken trees clearly heard distress calls. According to one of the scientists, most parched trees transmit their plight in the 50-hertz to 50kilohertz range. (The unaided human ear can detect no more than 20 kilohertz). Red oak, maple, white pine, and birch all make slightly different sounds in the form of vibrations at the surface of the wood.

The scientists think that the vibrations are created when the water columns inside tubes that run along the length of the tree break, a result of too little water following through them.

These fractured columns send out distinctive vibration patterns. Because some insects communicate at ultrasonic frequencies, they may pick up the trees' vibration and attack the weakened trees. Researchers are now running tests with potted trees that have been deprived of water to see if the sound is what attracts the insects. “Water-stressed trees also smell differently from other trees, and they experience thermal changes, so insects could be responding to something other than sound”, one scientist said.

Which of the following is the main topic of the passage?

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Đáp án đúng: D

Giải thích: Dựa vào câu “It’s a sound you will probably never hear, a sickened tree sending out a distress signal.”

Dịch: “Đó là âm thanh mà bạn có thể sẽ không bao giờ nghe thấy, một cái cây ốm yếu phát ra tín hiệu đau đớn.”


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