单项选择题
As the temperature for a given mass of air increases，the（）.
A.dew point increases B.dew point decreases C.relative humidity increases D.relative humidity decreases
单项选择题 Anticyclones are usually characterized by（）.
单项选择题 An occluded front on a weather map is colored（）.
单项选择题 An aneroid barometer is an instrument（）.
