单项选择题
（）get your engine ready before six tomorrow morning.
A.You’d better
B.You would better
C.You at least
D.You at most
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By plotting the analysis messages on weather charts，we are able to（）.
A.prevent any possible accident at sea
B.prepare a reasonable forecast of the wind and weather
C.help the mariner to fix a accurate ship's position
D.aid the salvage of a ship in peril
