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單項選擇題

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

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單項選擇題

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

單項選擇題

Prevailing winds between 30°N and 60°N latitude are from the（）.

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

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