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

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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