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【题目】CO2 is __________ one carbon atom(碳原子)and two oxygen(氧)atoms.

A.made fromB.made ofC.made up of

【答案】C

【解析】

句意:CO2有一个碳原子和两个氧原子组成。

考查动词短语。A. made from表示由……制成,看不出原材料;B. made of表示由……制成,可以看出原材料;C. made up of表示由……组成。根据句意可知,故选C

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