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

The ratio of the work done by 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 machine______the work done on it is called the efficiency of the machine.
选项 A、against
B、to
C、for
D、with
答案B
解析 ratio表示两者之间的“比率或比例”，常与to搭配。根据句意，本题选B。
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