单选题A slow，gradual fall of the barometer indicates approaching（）.Agale force winds within 12 hoursBblizzard conditionsCdeteriorating or unsettled weatherDheavy，wind driven rain
单选题
A slow，gradual fall of the barometer indicates approaching（）.
A
gale force winds within 12 hours
B
blizzard conditions
C
deteriorating or unsettled weather
D
heavy，wind driven rain
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