单项选择题Navigational warnings and weather bulletins for shipping()from Singapore Radio.

A.broadcast
B.broadcasted
C.are broadcast
D.are broadcasted


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2.单项选择题Most high pressure areas are accompanied by().

A.precipitation
B.clear,cool weather
C.humid,sticky weather
D.cool fogs

5.单项选择题Little or no change in the barometric reading over a twelve hour period indicates().

A.stormy weather is imminent
B.that present weather conditions will continue
C.a defect in the barometer
D.increasing wind strength

6.单项选择题In the relatively calm area near the hurricane center,the seas are().

A.moderate but easily navigated
B.calm
C.mountainous and confused
D.mountainous but fairly regular as far as direction is concerned

7.单项选择题In the doldrums you will NOT have().

A.high relative humidity
B.frequent showers and thunderstorms
C.steep pressure gradients
D.frequent calms

8.单项选择题In the doldrums you can expect().

A.steady,constant winds
B.frequent rain showers and thunderstorms
C.steep pressure gradients
D.low relative humidity

9.单项选择题In reading a weather map,closely spaced pressure gradient lines would indicate().

A.high winds
B.high overcast clouds
C.calm or light winds
D.fog or steady rain

10.单项选择题In North America the majority of the weather systems move from().

A.north to south
B.south to north
C.east to west
D.west to east