2017年下半年公共英语PETS二级阅读理解练习题（二十一）
阅读下列短文,回答题目.
Thousands of years ago man used handy rocks for his surgical operations. Later he used sharp bones or horns, metal knives and more recently, rubber and plastic. 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 indus- try, but which was also 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. As we all know, light is hot, and any source of light 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 pro- duce beams that have a particular effect on certain living cells. It is now possible for eye surgeons to operate on the back of human eye without harming the front of the eye, simply by passing a laser beam right through the eye-ball. Operations which once left patients exhausted and in need of long period of recovery time now leave them feeling relaxed and comfortable.
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.
1.Which of the following would be appropriate to describe the instruments of surgical opera- tions up until 1960s?
A.Traditional.
B.Complicated.
C.Remarkable.
D.Revolutionary.
参考答案：A
参考解析：
答案及解析
A【解析】事实细节题。题干的意思是“以下哪个单词能够确切描述20世纪60年代以前的手术工具?”A选项的意为“传统的”;B选项意为“复杂的”;C选项意为“非凡的”;D选项意为“革命的”。原文第一段提到几千年前人们用石头、牛角等做手术，由此可以推断出选项A是正确的。
2.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.
参考答案：D
参考解析：D【解析】事实细节题。题干的意思是“20世纪60年代激光取得发展后我们可以发现什么?”根据原文第一段最后一句可知“激光为外科手术带来革命性的变化”，故选D。
3.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
参考答案：B
参考解析：B【解析】事实细节题。题干的意思’是“为什么激光束的能量比较强?”根据原文第二段最后一句可知“能量被集中到一起而变得强大”。故答案为B。
4.After the use of the laser beam, surgeons can perform operations 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
参考答案：C
参考解析：C【解析】事实细节题。题干的意思是“使用激光束做手术时医生可以。文中第三段提到“曾经一度让患者疲惫不堪，并且术后恢复时间漫长的手术现在让患者变得很轻松很舒服”，可以排除A和D。由文中最后一句“也许一些癌症也能够用激光来治疗”可知B选项不正确。C选项意思为“使患者受到很小的伤害”。所以正确答案为C。
