Câu hỏi:
10/10/2021 909Read 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 31 to 35
Nanotechnology is the creation and use of materials or devices at extremely small scales. These materials or devices fall in the range of 1 to 100 nanometers (nm). One nm is equal to one-billionth of a meter (.000000001 m), which is about 50,000 times smaller than the diameter of a human hair. Scientists refer to the dimensional range of 1 to 100 nm as the nanoscale, and materials at this scale are called nanocrystals or nanomaterials.
The nanoscale is unique because nothing solid can be made any smaller. It is also unique because many of the mechanisms of the biological and physical world operate on length scales from 0.1 to 100 nm. At these dimensions materials exhibit different physical properties; thus scientists expect that many novel effects at the nanoscale will be discovered and used for breakthrough technologies.
A number of important breakthroughs have already occurred in nanotechnology. These developments are found in products used throughout the world. Some examples are catalytic converters in automobiles that help remove air pollutants, devices in computers that read from and write to the hard disk, certain sunscreens and cosmetics that transparently block harmful radiation from the Sun, and special coatings for sports clothes and gear that help improve the gear and possibly enhance the athlete’s performance. Still, many scientists, engineers, and technologists believe they have only scratched the surface of nanotechnology’s potential.
Nanotechnology is in its infancy, and no one can predict with accuracy what will result from the full flowering of the field over the next several decades. Many scientists believe it can be said with confidence, however, that nanotechnology will have a major impact on medicine and health care; energy production and conservation; environmental cleanup and protection; electronics, computers, and sensors; and world security and defense.
(Adapted from: Encarta DVD 2009)
What is the passage mainly about?
Đáp án chính xác
Câu hỏi trong đề:
[Năm 2024] Đề thi thử môn Tiếng anh THPT Quốc gia có lời giải (30 đề) !!
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Trả lời:
Giải bởi Vietjack
Đáp án C
Tạm dịch: Đoạn văn chủ yếu nói về điều gì?
A. Một tính chất vật lý mới của các chất trong tự nhiên.
B. Một cách để sản xuất ra các sản phẩm công nghệ.
C. Sự giới thiệu về một công nghệ mới.
D. Tổng quan về cách mà công nghệ sẽ phát triển.
Dựa vào câu đầu tiên của đoạn văn: Công nghệ nano là sự tạo ra và sử dụng các vật liệu hoặc các thiết bị ở kích thước đặc biệt nhỏ. Và những câu văn giới thiệu về công nghệ này như: kích thước cụ thể của vật liệu nano (dòng 2 – đoạn 1: in the range of 1 to 100 nanometers), công nghệ này đang trong giai đoạn sơ khai (dòng đầu – đoạn cuối: in its infancy)
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Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions
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Câu 3:
Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions
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Câu 4:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
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Câu 5:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
The scientists are encountering the difficulties of _____ of radioactive waste.
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Câu 6:
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
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Câu 7:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
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