单项选择题

The weather is not as cold as you think. So I don't think the ice is thick enough to walk on it.

A．as you think
B．think
C．enough
D．walk on it
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单项选择题
Running slowly for some three miles every day is proved a good form of exercise.
A．some
B．is proved
C．form
D．exercise
单项选择题
Many unexpected problems have been arisen in the course of the reconstruction of the city.
A．Many
B．have been
C．course
D．of the city
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