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

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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
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
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