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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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

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