单项选择题

Please（） from smoking until the airplane is airborne.

A. prevent
B. resist
C. refrain
D. restrain

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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
单项选择题
5（）

A.scattered
B.separated
C.spread
D.dispelled
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