单项选择题

By saying "The Andrea Doria is known as the 'Mt. Everest of diving'", the author means that ______.

A．the Andrea Doria is as intimidating as Mt. Everest
B．shipwreck diving is both appealing and dangerous
C．it is extremely challenging to dive to the Andrea Doria
D．the depth of the Andrea Doria equals the height of Mt. Everest
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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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