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
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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
单项选择题
Nitrogen affects underwater divers in that ______.
A．divers who come to the surface too quickly suffer severe pains
B．the bloodstream of divers is compressed by excess nitrogen
C．divers' spinal column is extremely painful for lack of nitrogen
D．divers experience a condition known as the bends during diving
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