ACCORDING TO THE PASSAGE, WHAT IS TRUE ABOUT THE SIZE OF DINOSAURS

Câu 35 (TH):

According to the passage, what is TRUE about the size of dinosaurs?

A.

It made them the largest creatures ever on earth.

B.

It varied quite greatly.

C.

It guaranteed their survival.

D.

It was rather uniform.

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.