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 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
单项选择题
The reason why corn can be processed into other food additives is that ______.
A．it can serve as sweeteners during cooking
B．it contains an unparalleled amount of starch
C．its basic organic molecules can be broken down
D．its chemical composition can be changed and reorganized
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