单项选择题

In the control group, chimpanzees ______.

A．learned to use poking
B．learned to use lifting
C．learned to use neither poking nor lifting
D．stuck to poking or lilting
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单项选择题
Chimps and humans' motivation to conform to a group norm is ______.
A．material
B．social
C．trained
D．learned
单项选择题
How did Andrew Whiten and his colleagues study the chimpanzees' behaviour
A．Through training chimps.
B．Through comparing three groups of chimps.
C．Through trapping.
D．Through controlling three groups of chimps.
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