单项选择题
Which type of precipitation is a product of the violent convection found in thunderstorms（）.
A.Snow B.Freezing Rain C.Hail D.Sleet
单项选择题 Which of the following is not a wind（）.
单项选择题 Which condition suggests that your present position lies in the navigable semicircle of a tropical storm（）.
单项选择题 Which condition indicates that you are in a hurricane’s dangerous semicircle in the Northern hemisphere（）.
