单项选择题
The United States Food and Drug Administration has shown itself to be particularly
wary
with regard to alleged "miracle" drugs in recent times.
A．bellicose
B．exhausted
C．cautious
D．strange
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单项选择题
General acceptance of 3-D films may prove hard to come by as the experience of three decades ago indicated.
A．obtain
B．explain
C．understand
D．discerm
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单项选择题
Differences in positions adopted by oxygen and hydrogen atoms account for variations in the crystalline structure of different forms of ice.
A．are caused by
B．explain
C．derive from
D．constitute
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