填空题

This passage mainly discusses different theories about why we have dreams at night.

【参考答案】

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单项选择题
The difference between mountain climbing and shipwreck diving lies in ______.
A．the amount of oxygen
B．the atmospheric pressure
C．the breathing rate
D．the damaging degree of the human nervous system
单项选择题
The so-called whiskey factor refers to ______.
A．shipwrecks presenting a deadly maze to divers
B．shipwrecks holding potential accidents for divers
C．divers taking a shot of whiskey underwater
D．divers losing their senses in the course of diving
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