单选题What indicates that a tropical cyclone may be within 500 to 1，000 miles of your position?（）AA pumping of the barometer up and down a few millibarsBA sudden wind shift from southwest to northwest followed by steadily increasing windsCThe normal swell pattern becoming confused，with the length of the swell increasingDAn overcast sky with steadily increasing rain from nimbostratus clouds
单选题
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
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