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.