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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A．obtain
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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
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Many politicians find that they can no longer afford the luxury of a personal chauffeur.
A．valet
B．driver
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