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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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

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