木质纤维素是植物细胞壁的主要组成部分，它是一种丰富、廉价的可再生资源，大量存在于秸秆、木屑等农业废弃物中，是制备生物燃料的重要原料。木质纤维素由纤维素、半纤维素和木质素构成，自身结构特点导致其难以被木质纤维素酶降解，造成现有技术水平下生物燃料制取成本高昂。
根据文段，下列说法正确的是（ ）。

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