单项选择题

"Amputation of limbs" (Par

A．6 ) means ______.A. cutting off legs or armsB. disease of legs or armsC. curing of legs or armsD. discomfort of legs or arms
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单项选择题
Since 1939, numerous scientific studies ______.
A．proved smoking causes fatal diseases
B．proved smoking causes life-shorting diseases
C．proved smoking is a health risk
D．had been made to prove whether smoking causes life shorting
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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