单项选择题

From the third paragraph, we can infer that ______.

A．chimps keep in mind permanently what they learned
B．chimps stick to what they learned in discovery
C．chimps immediately give up what they learned
D．chimps pick up what they discovered

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单项选择题

The phrase fit in (Line l, Para. I) most likely means ______.

A．suit
B．adopt
C．adjust
D．conform

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