单项选择题

When snow accumulates on top of a building during the winter, the weight sometimes weakens the construction and occasionally causes the roof to collapse.

A. melts
B. collects
C. selects
D. scatters
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单项选择题
From the incident; they have learned that prompt decisions often lead to bitter regrets.
A. urgent
B. hasty
C. immediate
D. wise
单项选择题
Students have to obey the rules in the school.
A. reply to
B. apply for
C. abide with
D. comply with
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