单选题：Why did the chimpanzees walk on two limbs during Kyoto Unive

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题目内容：

Why did the chimpanzees walk on two limbs during Kyoto University's experiment____? A．Because they imitated the humnan way of walking just for fun.
B．Because they wanted to please the researchers to get more coula nuts fromthem.
C．Because they wanted to get to the nut-rich forest faster-by walking that way.
D．Because they wanted to carry more nuts with two free limbs.

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