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
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 word obesity (Line 2, Para. 1 ) most probably means ______.
A．lack of nutrition
B．becoming too fat
C．abundance in calories
D．shortening of life span
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