单项选择题
The area of strong westerly winds occurring between 40°S and 60°S latitude is called the（）.
A.polar easterlies
B.prevailing westerlies
C.roaring forties
D.jet streams
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The AMVER system requires（）.
A.Sailing plans to be sent before departure
B.More frequent reports in heavy weather
C.Arrival reports to be sent within 8 hours of arrival
D.A position report within 24 hours of departure -
单项选择题
Of the following，（）is not a wind.
A.Bora
B.Gust
C.Gregale
D.Floe -
单项选择题
If the center of low pressure is due west of you in the Northern Hemisphere，which wind direction should you expect（）.
A.South to west
B.South to east
C.West to north
D.North to east
