单项选择题

All the people were asked to give up their holidays on account of the national （）.

A. crisis
B. emergency
C. urgency
D. emergence

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单项选择题
5（）

A.scattered
B.separated
C.spread
D.dispelled
单项选择题
The clouds, which are formed after the eruption of the volcano, have （） the sun and now it is as dark as night.

A. blocked out
B. blocked in
C. blocked off
D. blocked up
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