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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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 -
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All of the following are associated with cumulonimbus clouds EXCEPT（）.
A.steady rainfall
B.hail storms
C.thunderstorms
D.tornadoes or waterspouts
