单选题：Some parts of the Earth are warm and some are cold because_

题目分类：英语
题目类型：单选题
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题目内容：

Some parts of the Earth are warm and some are cold because__________. A．a lot of the heat is reflected
B．there are clouds and dust in the air
C．different parts of the Earth receive and reflect different amounts of heat
D．different parts of the Earth have different sources of heat

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