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

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单项选择题

When experiencing heavy winds，you should reef sails to（）.

A.bring the sails parallel to the wind
B.reduce sail area exposed to the wind
C.allow the sails to catch more wind
D.remove all tension on the main and jib sheets

单项选择题

When a tornado moves over the water from land it is called a（）.

A.Tornado
B.Waterspout
C.Hurricane
D.Cyclone