Your facsimile prognostic chart indicates that you will cross the cold front of a low pressure system in about 24 hours.You should().
A、Expect to see cirrus clouds followed by altostratus and nimbostratus clouds
B、Alter course to remain in the navigable semicircle
C、Prepare for gusty winds,thunderstorms,and a sudden wind shift
D、Expect clear weather,with steady winds and pressure,until the front passe
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