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
<上一题 目录 下一题>
热门 试题

单项选择题
In the first decades of this century, the individual gene could be worked with fruitfully.
A. blindly
B. completely
C. productively
D. carefully
单项选择题
Cement was seldom used in building the Middle Ages.
A. crudely
B. rarely
C. originally
D. occasionally
相关试题