The sun heats the earth,（）is very important to living things.
- Athat
- Bwhat
- Cwhich
- Dwhere
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1、Perihelion is the point where the Sun（
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2、The process that occurs when heat is g
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3、__________the sun is the central body
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4、As a heat engine,（） energy is the sour
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5、Aphelion is the point where the Sun（）.
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6、The sensible heat of air is dependent
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