单项选择题

This passage is written mostly probably for those ______.

A．taking wreck diving as a sport
B．specializing in wreck research
C．focusing on shipwreck archaeology
D．interested in marine medical science
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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
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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