单项选择题
RYUKYU S TO SE 6 BEC 4－5.ISOL SHWRS.SEA 3 M BEC 2 M.SWELL SE 3－4M.This description is likely to be under the heading of（）.
A.FORECAST
B.GALE WARNING
C.SYNOPSIS
D.STORM WARNING
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Periodic publications notifying changes in，or additions to，previously published navigational data are（）.
A.Supplements
B.Annual Summary
C.Navigational Warnings
D.Notices to Mariners -
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On the high seas，a fog signal consisting of one prolonged blast followed by four short blasts would indicate the presence of a（）.
A.vessel being towed
B.fishing vessel engaged in trawling
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On the approach of a warm front the barometric pressure usually（）.
A.falls
B.rises
C.is steady
D.is unreliable
