單項選擇題（） blow more or less constantly（except when monsoons prevail）throughout all seasons at a mean speed of around 14 knots and are generally strongest in the late winter.

A.Trade Winds
B.Winds of the temperate zones
C.Monsoons
D.Land and Sea Breezes


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2.單項選擇題Steady precipitation is typical of（）.

A.coming cold weather conditions
B.a warm front weather condition
C.high pressure conditions
D.scattered cumulus clouds

4.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

5.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