单项选择题
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
All of the following are associated with cumulonimbus c...
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
After a cold front passes，the barometric pressure（）.A.d...
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
After a cold front passes the barometric pressure usual...
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
