单项选择题
According to Buys Ballot’s law，when an observer in the Northern Hemisphere experiences a northwest wind，the center of low pressure is located to the（）.
A.northeast B.west-southwest C.northwest D.south-southeast
单项选择题 A warm air mass is characterized by（）.
单项选择题 A series of brief showers accompanied by strong，shifting winds may occur along or some distance ahead of a(n)（）.
单项选择题 A sea breeze is a wind（）.
