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 underlined here means

A．uncertainties.
B．dependent conditions.
C．incidental thought.
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.