单项选择题

An air mass is termed warm if（）.

A.it is above 70°F
B.the ground over which it moves is cooler than the air
C.it originated in a high pressure area
D.it originated in a low pressure area

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单项选择题

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

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

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