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The laser is a very useful means for long-distance communications, the great accuracy in the direction of its beams______effecti
The laser is a very useful means for long-distance communications, the great accuracy in the direction of its beams______effecti
admin
2014-03-22
30
问题
The laser is a very useful means for long-distance communications, the great accuracy in the direction of its beams______effective use of small amount of power.
选项
A、makes
B、making
C、made
D、to make
答案
B
解析
句子的后半部分是全句的一个成分,即原因状语,在此处应由分词担当,根据句意“准确的光束定向有效地利用了少量的能源”,应选现在分词making。全句意为:激光是非常有用的远距离通讯工具,它的光束定向异常准确,能有效地利用少量的能源。
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