單項(xiàng)選擇題

An air mass is termed warm if（）.

A.it is above 70°F
B.the ground over which it moves is cooler than the air
C.it originated in a high pressure area
D.it originated in a low pressure area

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單項(xiàng)選擇題

All of the following are associated with cumulonimbus clouds EXCEPT（）.

A.steady rainfall
B.hail storms
C.thunderstorms
D.tornadoes or waterspouts

單項(xiàng)選擇題

After a cold front passes，the barometric pressure（）.

A.drops，and the temperature drops
B.drops，and the temperature rises
C.rises，and the temperature drops
D.rises，and the temperature rises

An air mass is termed warm if（）.

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All of the following are associated with cumulonimbus clouds EXCEPT（）.

After a cold front passes，the barometric pressure（）.

After a cold front passes，the barometric pressure（）.