单项选择题Snow has obliterated surface features and the sky is covered with uniform,altostratus clouds. There are no shadows and the horizon has disappeared. What is this condition called? ()

A.Ice blink
B.Whiteout
C.Water sky
D.Aurora reflection


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1.单项选择题Relative humidity is the percentage of water vapor that is in the air as compared to the maximum amount it can hold at().

A.a specific barometric pressure
B.a specific temperature
C.a specific wind speed
D.any time

2.单项选择题Recurvature of a hurricane’s track usually results in the forward speed().

A.increasing
B.decreasing
C.remaining the same
D.varying during the day

3.单项选择题Prevailing winds between 30°N and 60°N latitude are from the().

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

4.单项选择题Plain language is usually used on marine weather().

A.forecasts
B.observations
C.analyses
D.reports

6.单项选择题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
D.Purple

7.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

9.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