单项选择题

Altocumulus clouds are defined as（）.

A.high clouds
B.middle clouds
C.low clouds
D.vertical development clouds

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单项选择题
Above-normal tides near the center of a hurricane maybe caused by the（）.

A.high barometric pressure
B.jet stream
C.storm surge
D.torrential rains
单项选择题
A very light breeze that causes ripples on a small area of still water is a（）.

A.cat's paw
B.hog's breath
C.williwaw
D.chinook
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