单项选择题
A tropical storm is building strength some distance from your ship. Waves are coming from the east，with periods increasing from 5 seconds to 15 seconds. The swell is from the east. Where was the storm when these new swells were generated? （）
A.To the north of you B.To the south of you C.To the east of you D.To the west of you
单项选择题 A tropical cyclone has recurved and entered temperate latitudes. In the Northern Hemisphere when a large high pressure system lies north of the storm，what situation may occur?（）
单项选择题 A sylphon cell is a part of a（）.
单项选择题 A sea breeze is a wind（）.
