Câu hỏi:

06/08/2024 1,521

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42

There are many theories of aging, but virtually all fall into the category of being hypotheses with a minimum of supporting evidence. One viewpoint is that aging occurs as the body's organ systems become less efficient. Thus failures in the immune system, hormonal system, and nervous system could all produce characteristics that we associate with aging. Following a different vein, many current researchers are looking for evidence at the cellular and sub cellular level.

It has been shown that cells such as human fibroblasts (generalized tissue cells) grown in culture divide only a limited number of times and then die. (Only cancer cells seem immortal in this respect). Fibroblast cells from an embryo divide more times than those taken from an adult. Thus some researchers believe that aging occurs at the cellular level and is part of the cell's genetic makeup. Any event that disturbs the cell's genetic machinery such as mutation, damaging chemicals in the cell's environment, or loss of genetic material, could cause cells to lose their ability to divide and thus bring on aging. Other theories of aging look at different processes. Chronological aging refers to the passage of time since birth and is usually measured in years. While chronological age can be useful in estimating the average status of a large group of people, it is a poor indicator of an individual person's status because there is a tremendous amount of variation from one individual to the next in regard to the rate at which biological age changes occur. For example, on the average, aging results in people losing much of their ability to perform strenuous activities, yet some elderly individuals are excellent marathon runners.

Another type of aging is cosmetic aging, which consists of changes in outward appearance with advancing age. This includes changes in the body and changes in other aspects of a person's appearance, such as the style of hair and clothing, the type of eyeglasses, and the use of a hearing aid. Like chronological aging, it is frequently used to estimate the degree to which other types of aging have occurred. However, it is an inaccurate indicator for either purpose because of variation among individuals and because a person's appearance is affected by many factors that are not part of aging, including illness, poor nutrition, and exposure to sunlight

What is the best title for this passage?

A. Different Processes of Aging

B. Outstanding Characteristics Associated with Aging

C. Theories of Aging: Well Proven Hypotheses

D. Theories of Aging: Poorly Supported Hypotheses

Đáp án chính xác

Trả lời:

verified Giải bởi Vietjack

Đáp án A

Theo thông tin bài văn cung cấp, ta thấy:

-         There are many theories of aging, but virtually all fall into the category of being hypotheses with a minimum of supporting evidence.

-         One viewpoint is that aging occurs as the body's organ systems become less efficient.

-         Following a different vein, many current researchers are looking for evidence at the cellular and sub cellular level.

-         Another type of aging is cosmetic aging, which consists of changes in outward appearance with advancing age.

Dịch nghĩa:

“Có rất nhiều lý thuyết về sự lão hóa, nhưng hầu hết đều rơi vào dạng giả thuyết với bằng chứng hỗ trợ tối thiểu. Một quan điểm cho rằng sự lão hóa xảy ra khi các hệ thống cơ quan của cơ thể trở nên kém hiệu quả hơn. Do đó, sự suy giảm của hệ miễn dịch, hệ thống hormone, và hệ thần kinh đều có thể tạo ra các đặc điểm mà chúng ta liên kết với sự lão hóa. Theo một hướng khác, nhiều nhà nghiên cứu hiện tại đang tìm kiếm bằng chứng ở cấp độ tế bào và dưới tế bào.

Người ta đã chứng minh rằng các tế bào như nguyên bào sợi ở người (các tế bào mô tổng quát) khi nuôi cấy chỉ phân chia một số lần giới hạn rồi chết. (Chỉ có tế bào ung thư dường như bất tử trong khía cạnh này). Các tế bào nguyên bào sợi từ phôi thai phân chia nhiều lần hơn so với các tế bào lấy từ người lớn. Do đó, một số nhà nghiên cứu tin rằng sự lão hóa xảy ra ở cấp độ tế bào và là một phần của cấu tạo di truyền của tế bào. Bất kỳ sự kiện nào làm rối loạn bộ máy di truyền của tế bào như đột biến, các hóa chất gây hại trong môi trường tế bào, hoặc mất vật liệu di truyền, đều có thể khiến các tế bào mất khả năng phân chia và do đó dẫn đến sự lão hóa. Các lý thuyết khác về sự lão hóa xem xét các quá trình khác nhau. Lão hóa theo thời gian đề cập đến khoảng thời gian từ khi sinh ra và thường được đo bằng năm. Mặc dù tuổi theo thời gian có thể hữu ích trong việc ước tính trạng thái trung bình của một nhóm lớn người, nhưng nó là một chỉ số kém về trạng thái của một cá nhân vì có rất nhiều sự biến đổi từ người này sang người khác về tốc độ thay đổi của tuổi sinh học. Ví dụ, trung bình, sự lão hóa dẫn đến việc con người mất đi phần lớn khả năng thực hiện các hoạt động cường độ cao, tuy nhiên, một số người cao tuổi vẫn là những vận động viên chạy marathon xuất sắc.

Một loại lão hóa khác là lão hóa thẩm mỹ, bao gồm những thay đổi về ngoại hình khi tuổi tác tăng lên. Điều này bao gồm các thay đổi về cơ thể và các khía cạnh khác của ngoại hình của một người, như kiểu tóc và quần áo, loại kính mắt và việc sử dụng máy trợ thính. Giống như lão hóa theo thời gian, nó thường được sử dụng để ước tính mức độ mà các loại lão hóa khác đã xảy ra. Tuy nhiên, nó là một chỉ số không chính xác cho cả hai mục đích vì sự biến đổi giữa các cá nhân và vì ngoại hình của một người bị ảnh hưởng bởi nhiều yếu tố không phải là một phần của sự lão hóa, bao gồm bệnh tật, dinh dưỡng kém và tiếp xúc với ánh sáng mặt trời.

Câu hỏi: Tiêu đề nào phù hợp nhất cho đoạn văn này?

A. Các quá trình khác nhau của sự lão hóa

B. Các đặc điểm nổi bật liên quan đến sự lão hóa

C. Các lý thuyết về sự lão hóa: Những giả thuyết được chứng minh tốt

D. Các lý thuyết về sự lão hóa: Những giả thuyết được hỗ trợ kém.”

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