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
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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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