【单选题】【消耗次数：1】
I don’t think you’ll be able to understand this formula（公式）___ you finish school.
①
as if
②
only when
③
even
④
even when
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有关纤维素的说法，错误的是（ ）。
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人体内含有能够促使纤维素水解的酶，纤维素在人体内能够被消化吸收
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纤维素是白色、没有气味和味道的纤维状结构的物质
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纤维素是一种天然高分子化合物
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