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（）.
单项选择题 After a cold front passes the barometric pressure usually（）.
单项选择题 A WIND BLOWS ROUND ANTICLOCKWISE defines（）.
