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（）.
单项选择题 All of the following are associated with cumulonimbus clouds EXCEPT（）.
单项选择题 After a cold front passes，the barometric pressure（）.
