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單項選擇題

All of the following are associated with cumulonimbus clouds EXCEPT（）.

A.steady rainfall
B.hail storms
C.thunderstorms
D.tornadoes or waterspouts

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單項選擇題

After a cold front passes，the barometric pressure（）.

A.drops，and the temperature drops
B.drops，and the temperature rises
C.rises，and the temperature drops
D.rises，and the temperature rises

單項選擇題

After a cold front passes the barometric pressure usually（）.

A.fluctuates
B.remains the same
C.remains the same，with clouds forming rapidly
D.rises，often quite rapidly，with clearing skies

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