2. 外语
  3. The doctor tried to do an experiment to find out the______of the medicine on the mice.

The doctor tried to do an experiment to find out the______of the medicine on the mice.

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问题 The doctor tried to do an experiment to find out the______of the medicine on the mice.
选项 A、cause
B、result
C、reason
D、effect
答案D
解析 句意是：医生试图做试验来发现这种药物在老鼠身上的效果，所以选择D。其他三项cause意思是原因，result意思是结果，reason意思是理由，不符题意。
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