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 题中ratio与介词to是固定搭配，the ratio of A to B的意思为“A与B之比(率)”，故选C。
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