A.Change direction in a clockwise manner in the Norther……

单项选择题What benefit is a weather bulletin to a mariner（）.

A.It provides a legal reason to cancel a projected voyage
B.It allows the mariner to make long term weather forecasts
C.It is of little benefit since the weather changes frequently and rapidly
D.It gives the mariner time to prepare for weather changes

单项选择题West backing south-west gale 8 locally storm 10（）then rain or sleet mainly good.

A.windy showers
B.showers with winds
C.wintry showers
D.showery winds

单项选择题Weather observations provided by each weather station include all of the following except（）.

A.temperature
B.visibility
C.predicted weather for the next twelve hours
D.barometric pressure and change in the last three hours

单项选择题Weather information is available from（）.

A.Commercial radio broadcasts
B.The Coast Guard on scheduled marine information broadcasts
C.VHF-FM continuous marine weather broadcasts provided by the National Weather Service
D.All of the above

单项选择题Weather forecast messages are usually（）.

A.Given only to TV stations
B.Transmitted only by commercial broadcast stations
C.Broadcast in plain language
D.Broadcast immediately on VHF Channel 16 and 2182 kHz