单项选择题

A．To find out how clever monkeys were.
B．To test intelligence of different animals.
C．To tell the difference between man and the monkeys.
D．To find out how monkeys search food.
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单项选择题
A．Susan Evans rings a bell.B．The name sounds familiar to the man.C．The man never heard of the name.D．The man is not sure about the bell.
A．Susan Evans rings a bell.
B．The name sounds familiar to the man.
C．The man never heard of the name.
D．The man is not sure about the bell.
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