单项选择题

The phrase "coming back out of the cave" in the fifth paragraph means ______.

A．coming back home
B．going back home
C．living a luxurious life
D．restoring direct human contract
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单项选择题
Cigar and pipe smokers consume ______.
A．slightly less nicotine than cigarette smokers
B．less nicotine than cigarette smokers
C．no less nicotine than cigarette smokers
D．much less nicotine than cigarette smokers
单项选择题
One of the major difficulties of research into human health problems is the difficulty of ______.
A．knowing how many factors there are
B．isolating particular, individual factors from the complex human environment
C．knowing the complex human environment
D．increasing the number of the competent physicians
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