单项选择题

"Amputation of limbs" (Para. 6 ) means ______.

A．cutting off legs or arms
B．disease of legs or arms
C．curing of legs or arms
D．discomfort of legs or arms
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单项选择题
According to 1970 figures in the U.S. men smokers are ______.
A．twice as many as women smokers
B．two times as many as women smokers
C．1.5 times as many as women smokers
D．seventeen percent less than women 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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