单项选择题
When your vessel is on or near the path of an approaching tropical storm the（）.
A.wind direction remains steady B.wind speed increases C.barometer falls D.All of the above
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（）.
单项选择题 Wen a hurricane passes over colder water or land and loses its tropical characteristics，the storm becomes a（n）（）.
