The first paragraph mainly tells us______. According to the passage, we can conclude that in some areas if farmers who grow gra

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问题 The first paragraph mainly tells us______.
According to the passage, we can conclude that in some areas if farmers who grow grapes light fires in the early morning, that is because the farmers want to______.

选项 A、drive away warm air
B、prevent cold air from coming to harm their plants
C、cause more wind
D、stop warm air running away