单项选择题

It is significant that chimpanzees make tools, but it is more important that ______.

A．they never make tools before they need them
B．they can make up simple equations
C．they stack items to make platforms
D．the tools are crude
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单项选择题
From the sentence Like Proust, the French author whose experiences became his literary capital, man can recapture the past. , you can tell that Proust ______.
A．wrote primarily to improve his future life
B．discovered thing about his future life
C．described man's development of time sense
D．wrote about past experiences
单项选择题
This article is about ______.
A．time sense in animals
B．how man's time sense separates him from animals
C．man's preoccupation with past and future events
D．how apes understand time relationships
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