单项选择题

Weather forecast messages are usually（）.

A.Given only to TV stations
B.Transmitted only by commercial broadcast stations
C.Broadcast in plain language
D.Broadcast immediately on VHF Channel 16 and 2182 kHz

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单项选择题

Weather conditions in the middle latitudes generally move（）．

A.Eastward
B.Westward
C.Northward
D.Southward

单项选择题

The winds you would expect to encounter in the North Atlantic between latitudes 5° and 30° are known as the（）.

A.Doldrums
B.Westerlies
C.Trades
D.Easterlies