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
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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
