2016～2017英语周报高三课标答案

21.ACD【解析】脂质中的脂肪不构成膜结枃,A错误;核糖、脱氧核糖屬于糖类,但并不作为生物体的能源物质,故糖类不都是生物体的能源物质,B正确;胆固醇是构成动物细胞膜的重要成分,C错误;由于脂肪与糖类相比的含量多,氧的含量少,所以质量相同的糖类和脂肪被彻底氧化分解时,脂肪的耗氧量应多于糖类,D错误。

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