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    【题目】我国冬季南北温差大的根本原因是（）

    A.地表形态不同B.纬度高低不同C.地势高低不同D.海陆位置不同

    【答案】B

    【解析】

    根据我国地域辽阔，地跨众多的温度带和干湿地区，加上我国地形复杂，地势高低悬殊，更增加了我国气候的复杂多样性；我国冬季南北气温差异大，南方温暖，而越往北气温就越低．夏季南北普遍高温，进行分析解答。

    我国位于北半球，南北跨将近50个纬度。在冬季，太阳直射在南半球，对北半球来说，纬度越高，正午太阳高度角越低。我国北方地区正午太阳高度角比南方低，白昼短，得到太阳的光热少。所以，我国黑龙江省北部冬季低温可达30～40℃，滴水成冰，大地白雪皑皑；而海南省冬季平均气温在20℃左右，气候暖热，到处绿树成阴。故选：B。

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