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
After the whole day's march; they are too fatigued to walk any more.（）

A. hungry
B. sleepy
C. thirsty
D. tired
单项选择题
Each leader had a solemn look as he signed the peace treaty.（）

A. sincere
B. grave
C. honest
D. suspicious
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