单项选择题
Which condition indicates that you are in a hurricane’s dangerous semicircle in the Northern hemisphere（）.
A.A backing wind B.A veering wind C.A norther D.A strong，gusty wind
单项选择题 When your vessel is on or near the path of an approaching tropical storm the（）.
单项选择题 When experiencing heavy winds，you should reef sails to（）.
单项选择题 When a tornado moves over the water from land it is called a（）.
