单项选择题

Anticyclones are usually characterized by（）.

A.dry，fair weather
B.high winds and cloudiness
C.gustiness and continuous precipitation
D.overcast skies

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单项选择题

An occluded front on a weather map is colored（）.

A.blue line
B.purple line
C.dashed blue line
D.alternate red and blue line

单项选择题

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

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