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Câu hỏi:

16/09/2021 448

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

 Just as optical fibers have transformed communication, they are also revolutionizing medicine. These ultra - thin, flexible fibers have opened a window into the living tissues of the body. By inserting optical fibers through natural openings or small incisions and then threading them along the body's established pathways, physicians can look into the lungs, intestines, heart and other areas that were formerly inaccessible to them.

 The basic fiber-optics system is called fiberscope, which consists of two bundles of fibers. One, the illuminating bundle, carries light to the tissues. It is coupled to a high-intensity light source. Light enters the cores of the high-purity silicon glass and travels along the fibers. A lens at the end of the bundle collects the light and focuses it into the other bundle, the imaging bundle. Each fiber in the bundle transmits only a tiny fraction of the total image. The reconstructed image can be viewed through an eyepiece or displayed on a television screen. During the last five years, improved methods of fabricating optical fibers have led to a reduction in fiberscope diameter and an increase in the number of fibers, which in turn has increased resolution.

 Optical fibers can also be used to deliver laser light. By use of laser beams, physicians can perform surgery inside the body, sometimes eliminating the need for invasive procedures in which healthy tissue must be cut through to reach the site of disease. Many of these procedures do not require anesthesia and can be performed in a physician's office. These techniques have reduced the risk and the cost of medical care.

According to the passage, how do the fiberscopes used today differ from those used in five years ago?

A. They use brighter light.

B. They are longer.

C. They contain more fibers.

Đáp án chính xác

D. They are larger in diameter.

 Xem lời giải

Trả lời:

verified Giải bởi Vietjack

Câu 41: Đáp án C

Phương pháp giải:

Kiến thức: Đọc hiểu – chi tiết

Giải chi tiết:

Theo đoạn văn, kính soi sợi được sử dụng ngày nay khác với kính được sử dụng trong 5 năm trước như thế nào?

A. Chúng sử dụng ánh sáng sáng hơn.

B. Chúng dài hơn.

C. Chúng chứa nhiều sợi hơn.

D. Chúng có đường kính lớn hơn.

Thông tin: During the last five years, improved methods of fabricating optical fibers have led to a reduction in fiberscope diameter and an increase in the number of fibers, which in turn has increased resolution.

Tạm dịch: Trong 5 năm qua, các phương pháp chế tạo sợi quang học được cải tiến đã làm giảm đường kính ống soi và tăng số lượng sợi, do đó độ phân giải tăng lên.

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