单项选择题

Differences in positions adopted by oxygen and hydrogen atoms account for variations in the 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
The mother is told that her child is desperately ill—the chances of survival are slim, and treatment is as dreadful as the disease.
A．incurable
B．fearful
C．impossible
D．troublesome
单项选择题
Mr. Dane went through his daughter's essay carefully, to eliminate slang words from it.
A．reduce
B．exchange
C．remove
D．exhibit
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