What indicates that a tropical cyclone may be within 500 to 1，000 miles of your position?（）<br>A:A pumping of the barometer up and down a few millibars<br>B:A sudden wind shift from southwest to northwest followed by steadily increasing winds<br>C:The normal swell pattern becoming confused，with the length of the swell increasing<br>D:An overcast sky with steadily increasing rain from nimbostratus clouds

What indicates that a tropical cyclone may be within 500 to 1，000 miles of your position?（）
A:A pumping of the barometer up and down a few millibars
B:A sudden wind shift from southwest to northwest followed by steadily increasing winds
C:The normal swell pattern becoming confused，with the length of the swell increasing
D:An overcast sky with steadily increasing rain from nimbostratus clouds

出自：海船船员证

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