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單項(xiàng)選擇題

As the temperature of the air reaches the dew point，（）.

A.rain must develop
B.fog may form
C.it begins to snow
D.water freezes

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單項(xiàng)選擇題

As the temperature of an air mass decreases，the（）.

A.absolute humidity decreases
B.relative humidity increases
C.specific humidity decreases
D.dew point rises

單項(xiàng)選擇題

As the South Equatorial Current approaches the east coast of Africa，it divides with the main part flowing south to form the warm（）.

A.Agulhas Current
B.Canary Current
C.Benguela Current
D.Madagascar Current

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