单项选择题

A.used to measure the speed of windB.in which the press……

An aneroid barometer is an instrument（）.

A.used to measure the speed of wind
B.in which the pressure of the air is measured
C.that tells which direction a storm is coming from
D.used to measure the height of waves

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单项选择题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

单项选择题All of the following are associated with cumulonimbus clouds EXCEPT（）.

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

单项选择题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

单项选择题After a cold front passes the barometric pressure usually（）.

A.fluctuates
B.remains the same
C.remains the same，with clouds forming rapidly
D.rises，often quite rapidly，with clearing skies

单项选择题A WIND BLOWS ROUND ANTICLOCKWISE defines（）.

A.Backing (of wind)
B.Beach (to)
C.Veering (of wind)
D.Maintaining direction of the wind