单选题 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______.

【正确答案】 B
【答案解析】[考点] 推断题
[解析] 从文章提到的空气运动推断：有些地方的葡萄农为了给葡萄保温而点火。目的是想让地面上的冷空气经火加温而升高，故选B。