单项选择题
On a working copy of a weather map，a cold front is represented by what color line? （）
A.Red
B.Blue
C.Alternating red and blue
D.Purple
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NASHA VERELLA ST JACQUES ZENMU ANSHA REEF CLOUDY TO OVERCAST WITH SHOWERS WIND SW 17 TO 21 SEA MOD VIS GOOD TO MOD.The abovementioned forecast is probably from（）.
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