单项选择题

What does the passage mainly discuss

A．The difference between psychology and physiology.
B．The difference between human and animal behavior.
C．How fear would be explained by an psychologist .
D．How scientists differ in their approaches to explain things.

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单项选择题

It can be inferred from the passage that the Sun's light travels ______.

A．through solid objects in space
B．in many different directions
C．further in summer than in winter
D．more slowly than scientists previously believed

单项选择题

In the third sentence of the first paragraph the word deal could best be replaced by ______.

A．barter.
B．bargain.
C．are involved.
D．are concerned.