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