What do we find after the development of the laser in the 1960s? The reason why the laser beam is very strong is that

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问题 What do we find after the development of the laser in the 1960s?
The reason why the laser beam is very strong is that

选项 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

答案B

解析细节题。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。

转载请注明原文地址:https://kaotiyun.com/show/Xx5d777K

本试题收录于：公共英语二级笔试题库公共英语（PETS）分类

公共英语二级笔试

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What do we find after the development of the laser in the 1960s? The reason why the laser beam is very strong is that

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