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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单项选择题
Perhaps more than anything else, it was onerous taxes that led to the Peasants' Revolt in England in 1381.
A．multiple
B．unjust
C．burdensome
D．infamous
单项选择题
No other newspaper columnist has managed as yet to rival Ann Landers' popularity in terms of readership.
A．though
B．in spite of this
C．even
D．so far
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