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

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

单项选择题A WIND BLOWS ROUND ANTICLOCKWISE defines（）.

A.Backing (of wind)
B.Beach (to)
C.Veering (of wind)
D.Maintaining direction of the wind

单项选择题A weather map is a synoptic data because it（）.

A.summarizes a great deal of information
B.can be interpreted accurately
C.appears daily
D.is prepared by the Weather Bureau

单项选择题A weather forecast states that the wind will commence backing. In the Northern Hemisphere，this would indicate that it will（）.

A.shift in a clockwise manner
B.shift in a counterclockwise manner
C.continue blowing from the same direction
D.decrease in velocity