单项选择题
A.Expect to see cirrus clouds followed by altostratus and nimbostratus clouds
B.Alter course to remain in the navigable semicircle
C.Prepare for gusty winds，thunderstorms，and a sudden wind shift
D.Expect clear weather，with steady winds and pressure，until the front passes
单项选择题 You have determined that you are in the right semicircle of a tropical cyclone in the Northern Hemisphere.What action should you take to avoid the storm（）.
单项选择题 Which type of precipitation is a product of the violent convection found in thunderstorms（）.
单项选择题 Which of the following is not a wind（）.