单项选择题
Plain language is usually used on marine weather（）.
A.forecasts
B.observations
C.analyses
D.reports
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On the pole side of the high pressure belt in each hemisphere，the pressure diminishes. The winds along these gradients are diverted by the Earth’s rotation toward the east and are known as the（）.
A.geostrophic winds
B.doldrums
C.horse latitudes
D.prevailing westerlies -
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On a working copy of a weather map，a cold front is represented by what color line? （）
A.Red
B.Blue
C.Alternating red and blue
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Navigational warnings and weather bulletins for shipping（）from Singapore Radio.
A.broadcast
B.broadcasted
C.are broadcast
D.are broadcasted
