【多选题】【消耗次数：1】
8.下列哪些是关于脂类的真实叙述（多选）？
①
A．它们是细胞内能源物质；
②
B．它们很难溶于水
③
C．是细胞膜的结构成分；
④
D．它们仅由碳、氢、氧三种元素组成。
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