单选题A rapid rise or fall of the barometer indicates（）.Aheavy rain within six hoursBa decrease in wind velocityCa change in the present weather conditionsDthat fog will soon set in
单选题
A rapid rise or fall of the barometer indicates（）.
A
heavy rain within six hours
B
a decrease in wind velocity
C
a change in the present weather conditions
D
that fog will soon set in
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