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Read the passage and mark the letter A, B, C or D to answer the questions from 30 -34
Fiberscopes are one of the most important Outcomes of the science of fiber optics. Fibers made of glass and transparent acrylic plastic are capable of conveying light energy, and when thousands of these fibers are combined in what is called a fiberscope, they can transmit images. The most common fiberscopes contain about 750,000 fibers, each 0.001 centimeter, or 10 microns, in diameter. For certain uses, the diameter of the fiber may be as small as 5 microns.
Fiberscopes have a wide range of applications. In the medical field, physicians use fiberscopes to examine internal organs and as an aid in delicate surgeries. Miniature probes have also been developed to view muscle fiber, skin tissue, and blood cells. Fiberscopes have also found varied uses in industry, particularly to inspect or control operations in inaccessible areas. Bundles of fiberscopes fused together in a solid plate, called a faceplate, are being used in the manufacture of television picture tubes and other cathode-ray tube devices.
The most far-reaching applications of fiber-optic technology are in communications. Optical fibers carry voice messages for telephone service. The sound of the voice is electronically broken down into thousands of pulses per second, which causes a transmitting laser to send coordinated pulses of light through the optical fibers. At the receiving end, the light pulses are converted to electrical signals and the voice message is reconstructed. Light-wave communication systems can handle an immensely greater number of telephone calls and television programs than the current system, and they will form the basis of the "electronic superhighway" expected to crisscross the nation in the near future of the information age.
Câu hỏi:The main topic of the passage is __________
- A. The birth of the "electronic superhighway"
- B. The various applications of fiber-optic technology
- C. How fiberscopes have enhanced the Held of medicine
- D. How sound may be transformed into light
Lời giải tham khảo:
Đáp án đúng: B
Đáp án B
(Pars. 2,3 talks about the different applications of fiberscopes or fiber-optic technology: in the medical field, in industry, and in communications.)
Dịch nghĩa: Đoạn 2,3 nói về ứng dụng khác nhau của máy nội soi hay công nghệ sợi quang: trong lĩnh vực y học, công nghiệp và giao tiếp
Câu hỏi này thuộc đề thi trắc nghiệm dưới đây, bấm vào Bắt đầu thi để làm toàn bài
Hướng dẫn Trắc nghiệm Online và Tích lũy điểm thưởng
CÂU HỎI KHÁC
- Indicate the word whose underlined part differs from the other three in pronunciation: kites, hopes, balls, kicks
- Indicate the word whose underlined part differs from the other three in pronunciation: beard, hear, rear, swear
- Indicate the word that differs from the other three in the position of primary stress: career, prospect, effort, labour
- Indicate the word that differs from the other three in the position of primary stress: periodic, electric, contagious , suspicious
- Mr. Pike would scarcely keep track of his business by cell phone when he was in his one- month traveling,_____________?
- She did a funny little curtsy which Josh and Silver couldnt help __________ at.
- If the brides father ________ the car for the wrong time, she _____ at the Church by now
- Nowadays, people _________social networks with more and more caution.
- .....................Michelle tried hard, she didnt manage to win the competition.
- _________, I recognized him.
- Students are ______ less pressure as a result of changes in testing
- As well as its beautiful sun-soaked beaches and excellent gastronomy, the region boasts no fewer than thirty golf courses, _____ amateurs and professi
- High intelligent machines can be automated to operate without human ____.
- After graduating from university, I want to ____ my fathers footsteps
- After marriage, Mrs. Hoa always keeps a good _____ with her mother-in-law.
- During the Medieval period, people were made public ____ of being witches.
- It was ______ silent inside the old, abandoned house.
- He was a natural singer with a voice that was as clear as _.
- Face-to-face socializing is not as preferred as virtual socializing among the youth
- Mary has a strong desire to make independent decisions.
- Jane found herself in conflict with her parents over her future career.
- It was obvious that the deal was no longer tenable, so we kicked it into touch
- Lina is talking to her husband about sharing the chores equally Linda : From my point of view, all family members should share the chores
- Nam is talking about Hưng’s hairstyleNam: You really have a beautiful hairstyle now, Hưng!Hưng: _________! You’ve pushed me into the blush.
- In an educational context, the term ‘learner independence’ has gained increasing importance in recent years. It is of particular
- While some people seem to have an almost instinctive flaw for languages
- You also increase your chances of
- by learning according to your own needs and interests, using all available resources. Research shows that learners
- adopt this approach will undoubtedly manage to broaden their language abilities considerably and,
- The main topic of the passage is __________l
- Fiberscopes are being used to do all of the following EXCEPT _________
- The word 'inaccessible' in paragraph 2 means __________
- It can be inferred from the passage that fiberscopes _________
- As used in the last sentence, the word
- What is the best title for the passage?;l
- The word pristine” is closest in meaning to ______.
- Which of the following statements is NOT TRUE about Tourism?
- The word perception” can be replaced by ______.
- It can be inferred from the phrase Economic messages are needed in order to attract the publics interest.” is ______.
- According to the passage, negative environmental outcomes ______?
- The word they” in the last paragraph refers to ______.l
- As mentioned in paragraph 4, responsible programs promote education of ecological conservation and environmental sustainability, ______.
- A basic knowledge of social studies, such as history and geography, are considered a basic part of the education of every child.
- For thousands of years, man has created sweet-smelling substances from wood, herbs, and flowers and using them for perfume or medicine.
- Until the invention of the telephone, skyscrapers were not considered very practicable.
- Nobody in my class is more intelligent than Mr John
- If I were you, I would take a break,' Tom said to Daisy.
- It is impossible for you to buy a big house with little money
- He is very slow, so we won’t give him such an important task.
- He not only studies well, but also he sings well.
