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

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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

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