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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相关考题
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单项选择题
All of the following are associated with cumulonimbus clouds EXCEPT（）.
A.steady rainfall
B.hail storms
C.thunderstorms
D.tornadoes or waterspouts -
单项选择题
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 -
单项选择题
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
