单选题
公共英语二级
2011-08-19
The reason why the laser beam is very strong is that______.
A．[ A ] it is artificially illuminated
B．[ B ] it is made up of a concentrated beam of light
C．[ C ] it sends out heat in all directions *^考试大^o^在线^*^考试中心ω
D．[ D ] its heat is increased by the heat of the sun
参考答案
B
答案解析
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。
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According to the author, living in a city causes stress because there are so many people who are______.
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