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

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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

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