【題目】我國西部牧區(qū)和東部農(nóng)耕區(qū)的大致分界線是:

A.800mm等降水量線B.400mm等降水量線

C.200mm等降水量線D.50mm等降水量線

【答案】B

【解析】

季風(fēng)區(qū)的氣候受季風(fēng)影響。大范圍盛行而風(fēng)向隨季節(jié)有顯著變化的風(fēng),稱季風(fēng),主要是由于海洋與陸面溫度對比的季節(jié)變化所致。中國東鄰太平洋,夏季因大陸上氣溫高于海洋,洋面上的低層氣壓高于大陸上的氣壓,所以風(fēng)從海洋吹向大陸,形成濕熱的東南季風(fēng)(夏季風(fēng))。而在冬季,大陸上氣溫低于海洋上氣溫,因而大陸上氣壓高于海洋上氣壓,便形成了干冷的西北季風(fēng)(冬季風(fēng))。

400毫米年等降水量線基本與我國季風(fēng)區(qū)域非季風(fēng)區(qū)的分界線吻合,該線把我國大致劃分為東南與西北兩大半壁。東南半壁受季風(fēng)影響,雨熱同期,以種植業(yè)為主。西北半壁地處內(nèi)陸,降水稀少,氣候干旱,是我國重要的牧業(yè)地區(qū)。故選:B。

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