【題目】我國(guó)冬季南北溫差大的根本原因是（）

A.地表形態(tài)不同B.緯度高低不同C.地勢(shì)高低不同D.海陸位置不同

【答案】B

【解析】

根據(jù)我國(guó)地域遼闊，地跨眾多的溫度帶和干濕地區(qū)，加上我國(guó)地形復(fù)雜，地勢(shì)高低懸殊，更增加了我國(guó)氣候的復(fù)雜多樣性；我國(guó)冬季南北氣溫差異大，南方溫暖，而越往北氣溫就越低．夏季南北普遍高溫，進(jìn)行分析解答。

我國(guó)位于北半球，南北跨將近50個(gè)緯度。在冬季，太陽直射在南半球，對(duì)北半球來說，緯度越高，正午太陽高度角越低。我國(guó)北方地區(qū)正午太陽高度角比南方低，白晝短，得到太陽的光熱少。所以，我國(guó)黑龍江省北部冬季低溫可達(dá)30～40℃，滴水成冰，大地白雪皚皚；而海南省冬季平均氣溫在20℃左右，氣候暖熱，到處綠樹成陰。故選：B。

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