单选题：The reason why the laser beam is very strong is that______.

题目内容：
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
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答案解析：

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