单项选择题

What the American scientist did was to test ________.

A．recognition
B．remembering
C．the ability of people to learn the names
D．the ability of people to recognize faces
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单项选择题
Persons who took part in the test were ________.
A．college students
B．twelve men
C．H.M. Clarke and his assistants
D．performers
单项选择题
The manager wondered why ________.
A．the workman sent a bill to the company
B．the mice bought for the job were a male and a female
C．the workman had paid for the mice
D．mice were needed in repairing a house
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