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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Even the best-build machine will not run forever without proper maintenance.
A. eternally
B. smoothly
C. dependably
D. accurately
单项选择题
It is said the houses along this street will soon be demolished.
A. pulled down
B. pulled up
C. pulled off
D. pulled in
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