2. 外语
  3. The ratio of the work done by the machine ______the work done on it is called the efficiency of the machine.

The ratio of the work done by the machine ______the work done on it is called the efficiency of the machine.

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问题 The ratio of the work done by the machine ______the work done on it is called the efficiency of the machine.
选项 A、against
B、with
C、to
D、for
答案C
解析 ratio表示两者之间的“比率或比例”时，常与to搭配。其他三个介词不能与之构成搭配。
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