單項(xiàng)選擇題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.單項(xiàng)選擇題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.單項(xiàng)選擇題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.單項(xiàng)選擇題Prevailing winds between 30°N and 60°N latitude are from the（）.

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

4.單項(xiàng)選擇題Plain language is usually used on marine weather（）.

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