What the American scientist did was to test . Persons who took part in the test were .

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问题 What the American scientist did was to test ________.
Persons who took part in the test were ________.

选项 A、college students
B、twelve men
C、H.M. Clarke and his assistants
D、performers

答案C

解析从全文看，参与测试的显然有H．M．Clarke和实验对象。故本题答案为C。

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公共英语二级笔试

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