单项选择题
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
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
A.steady rainfall B.hail storms C.thunderstorms D.tornadoes or waterspouts