单项选择题

The word "contingencies" in the 5th paragraph means ______.

A．uncertainties
B．dependent conditions
C．incidental thoughts
D．events that may occur
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单项选择题
According to the article, which of the following statements is TRUE
A．Chimpanzees' sense of time is as good as man's.
B．Man developed from apes.
C．Memory and foresight contribute to intelligence.
D．Monkeys and apes are almost as intelligent as man.
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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