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【题目】An _________ is a scientific test that is done in order to discover what happens and to get new knowledge.
A.experiment
B.exchange
C.example

【答案】A
【解析】句意:一个……是一个科学测试,为了发现发生了什么还有获得知识。A.实验; B.交换; C.例子。结合句意选A。

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