2. 外语
  3. 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

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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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