单选题
Thousands of years ago man used handy rocks for his
surgical operations. Later he used sharp bone or horn, metal knives and more
recently, rubber and plastic and that was where we stuck, in surgical instrument
terms; for many years. In the 1960s a new tool was developed, one which was,
first of all, to be of great practical use to the armed forces and industry, but
which was also, in time, to revolutionize the art and science of
surgery. The tool is the laser and it is being used by more and
more surgeons all over the world, for a very large number of different
complaints. The word "laser" means: light amplification by stimulated emission
of radiation. As we all know, light is hot, any source of light — from the sun
itself down to a humble match burning — will give warmth. But light is usually
spread out over a wide area. The light in a laser beam, however, is
concentrated. This means that a light with no more power than that produced by
an ordinary electric light bulb becomes intensely strong as it is concentrated
to a pinpoint-sized beam. Experiments with these pinpoint beams
showed researchers that different energy sources produce beams that have a
particular effect on certain living cells. It is now possible for eye surgeons
to operate on the back of the human eye without harming the front of the eye,
simply by passing a laser beam right through the eyeball. No knives, no
stitches, no unwanted damage — a true surgical wonder. Operations which once
left patients exhausted and in need of long period of recovery time now leave
them feeling relaxed and comfortable. So much more difficult operations can now
be tried. The rapid development of laser techniques in the past
ten years has made it clear that the future is likely to be very exciting.
Perhaps some cancers will be treated with laser in a way that makes surgery not
only safer but also more effective. Altogether, tomorrow may see more and more
information coming to light on the diseases which can be treated
medically.
单选题
Which of the following would be appropriate to describe the instruments
for surgical operations up until 1960s?
单选题
What do we find after the development of the laser in the 1960s?
A. Industrial revolution brought surgery changed greatly.
B. Medical help became available for industrial workers.
C. The study of art went through a complete revolution.
D. Human being's methods in surgery changed greatly.
【正确答案】
D
【答案解析】细节题。答案对应于第一段最后一句: ...revolutionize the art and science of surgery，其中的revolutionize与[D]中的changed greatly同义，而the art and science of surgery与methods in surgery同义。此外，由后文中使用的一些词如a true surgical wonder等及常识也可推知正确答案。
单选题
The reason why the laser beam is very strong is that ______.
A. it is artificially illuminated
B. it is made up of a concentrated beam of light
C. it sends out heat in all directions
D. its heat is increased by the heat of the sun
【正确答案】
B
【答案解析】细节题。答案信息对应于第二段最后一句: ...as it is concentrated to a pinpoint-sized beam，即是由于集中而变得强大，选[B]。
单选题
After the use of the laser beam, surgeons can perform operation which
______.
A. leave their patients with negative effects
B. can treat only human eye diseases
C. do little damage to their patients
D. make their patients need a long time to recover
【正确答案】
C
【答案解析】细节题。答案信息对应于第三段倒数第二、三句：No knives，no stiches，no unwanted damage...relaxed and comfortable，即用激光手术给患者带来的伤害少，不需很长的恢复时间，故选[C]。
单选题
The rapid development of laser techniques has meant that ______.
A. surgery is likely to improve considerably
B. in another ten years we shall be able to cure cancer
C. in future all the diseases can certainly be cured
D. operations will be performed more complicatedly in the future
【正确答案】
A
【答案解析】分析推理题。最后一段对激光技术的发展给医疗手术带来的前景进行了展望。由第一句中的the future is likely to be very exciting及其余两句的意思综合可知[A]对。其余三项都不合文意。