单项选择题

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

A. selects
B. scatters
C. melts
D. accumulates
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单项选择题
The child's abnormal behavior puzzled the doctor.
A. funny
B. frightening
C. repeated
D. unusual
单项选择题
I enjoyed the play-it had a clever plot and very funny dialogues．
A．long
B．boring
C．original
D．humorous
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