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

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。
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