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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One word describes what makes Singapore work: discipline.
A．punishment
B．regulation
C．unemployment
D．salary
单项选择题
The United States Food and Drag 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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