单项选择题

案例分析题 A strong wind is usually caused by a difference in()

A. heat
B. pressure
C. atmosphere
D. air

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单项选择题
22()

A.could 
B.can 
C.would 
D.will
单项选择题
My sister has () friends at school. But she has ()good friends.

A. few, a few
B. a few, few
C. little, a little
D. a little, little
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