2018 英语周报 八年级 FJM 57答案

1.C纤维素的化学本质为糖类,其组成元素是C、H、O,纤维素酶的化学本质为蛋白质,其组成元素主要是C、H、O、N,二者不同,A错误;小麦的遗传物质是DNA,B错误;所有生物膜的基本骨架都是磷脂双分子层,C正确;蛋白质变性后仍有肽键,能与双缩脲试剂发生紫色反应,D错误。
Possible version:Tom thought for a moment and was about to agree, but he changed his mind. " I can't, BenYou know Aunt Polly wants the fence to be perfect. It has to be done very carefully.I don'tthink you can do it well enough. "He said to Ben, who looked a little discouraged. "Oh, Tom, I'llbe careful. Please let me have a try I would like to give you my apple if you agree, "requestedBen In the end, Tom gave up the brush with unwillingness on his face, but joy in his heartWhile ben worked at the fence in the hot sun Tom sat under a tree, eating the apple, andlanning how to get more help. many of his other friends walked past him. Each one came topllaugh, but remained to whitewash the fence because they all got interested in it. One by one, theywhitewashed the fence, each giving Tom a reward, big or small. If he hadn't run out ofwhitewash, Tom would have owned everything belonging to his friends. He had a most wonderful andidle Saturday, sitting in the shade and enjoying the rewards that his friends gave him
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