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
Which of the following is true according to the passage
A．Americans' standard of living is relatively low in the 1970s.
B．Americans are on average consuming 200 calories every day.
C．Farms are responsible for American overconsumption of calories.
D．Diabetes is the unavoidable result of Americans' consuming corn.
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