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    【题目】我国西部牧区和东部农耕区的大致分界线是：

    A.800mm等降水量线B.400mm等降水量线

    C.200mm等降水量线D.50mm等降水量线

    【答案】B

    【解析】

    季风区的气候受季风影响。大范围盛行而风向随季节有显著变化的风，称季风，主要是由于海洋与陆面温度对比的季节变化所致。中国东邻太平洋，夏季因大陆上气温高于海洋，洋面上的低层气压高于大陆上的气压，所以风从海洋吹向大陆，形成湿热的东南季风(夏季风)。而在冬季，大陆上气温低于海洋上气温，因而大陆上气压高于海洋上气压，便形成了干冷的西北季风(冬季风)。

    400毫米年等降水量线基本与我国季风区域非季风区的分界线吻合，该线把我国大致划分为东南与西北两大半壁。东南半壁受季风影响，雨热同期，以种植业为主。西北半壁地处内陆，降水稀少，气候干旱，是我国重要的牧业地区。故选：B。

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