2021-2022 英语周报高二上学期期中综合复习二答案

8.B【解析】DNA双螺旋结构以及碱基间的氢键使DNA分子具有较强的稳定性,A错误;复制后产生的两个子代DNA分子共含有4个游离的磷酸基团,B正确;DNA分子两条链中相邻碱基通过氢键连接,C错误;DNA聚合酶只能将单个脱氧核苷酸加到已有的核苷酸片段上,形成磷酸二酯键,D错误。

二、读后续写范文(满分25分)Possible version 1Paragraph 1:It was time to put an end to the Magic Marty show. I walked over. "It was fishing line. " I sneeredfolding my arms. Marty subconsciously fingered the fishing line and nervously whispered, "So, are yougoing to tell people? Seeing the panic in his eyes, somehow, I hesitated. Should I_reveal the secret, Martymight lose his new_ friends. Finally, after struggling for a moment, I replied, "Nah, I won't say anythingMarty let out a relieved sigh, and I turned to walk awayParagraph 2Waitr"Marty jumped in front of me. Unexpectedly, he patted my arm, grinning. "You' ve got a prettygood eye for magic. Want to join me? "I nodded joy fully. That's how the Magic Marty and MysteriousMatt Lunch Show began. Now we've been a magic team for three months. And since I became a fellowmagician, Marty has let me in on some of his other tricks. It turns out that instead of a fake magician, Martyis a real friend.(150 words

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