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.
The author uses the expression "have opened a window" to indicate that the use of optical fibers_____.
A. has enabled scientists to make amazing discoveries
B. sometimes requires a surgical incision
C. allows doctors to see inside the body without major surgery
D. has been unknown to the general public until quite recently
Giải bởi Vietjack
Câu 37: Đáp án C
Tác giả sử dụng cụm từ "đã mở một cửa sổ" để chỉ ra rằng việc sử dụng các sợi quang học ______.
A. đã cho phép các nhà khoa học tạo ra những khám phá đáng kinh ngạc
B. đôi khi yêu cầu một vết mổ
C. cho phép các bác sĩ nhìn thấy bên trong cơ thể mà không cần phẫu thuật lớn
D. vẫn chưa được công chúng biết đến cho đến gần đây
Thông tin: . These ultra - thin, flexible fibers have opened a window into the living tissues of the body. … physicians can look into the lungs, intestines, heart and other areas that were formerly inaccessible to them.
Tạm dịch: Những sợi siêu mỏng, linh hoạt này đã “mở ra một cửa sổ” vào các mô sống của cơ thể. … các bác sĩ có thể nhìn vào phổi, ruột, tim và các khu vực khác mà trước đây họ không thể tiếp cận được.
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