英语周报2018-202331期答案

英语周报2018-202331期答案已经整理完毕，供同学们学习参考，更多英语周报答案，请关注本站。

四、短文改错Yesterday our club held an English speech contest, whicwhose eme is"Challenge Myself". A largenumber of students attended te. the contest and showed their wonderful performances.On the stagehoughfacing great pressure, the speakers bravely overcame it and challengedthemachieve greatfidencessuccess. What's more, they impressed us deeplyith their nustconfidenceButThrough such A activity, we know a lot more about our students.we have gainedsuch asAndanwasgrowing strongself-confidence and honour.Besides, our clubIS

4.D【关键能力】本题结合基因表达和表观遗传考查考生的理解能力获取信息能力和应用能力。【解题思路】出题干信息可知,胞嘧啶在发生甲基化后转变成5-甲基胞嘧啶,但仍能与鸟嘌呤互补配对,不会改变基因中碱基互补配对的方式,A错误。基因启动子序列中的胞嘧啶甲其化会抑制基因的转录,推测胞嘧啶甲基化不会促进RNA聚合酶与DNA分子特定位点的结合,B错误。胞嘧啶发生甲基化后仍可以与鸟嘌呤互补配对,推测其不影响DNA复制过程中氢键的形成,C错误。由题干信息可知,DNA甲基化能抑制某些基因的转录,即能关闭某些基因的表达,其与表观遗传有关,D正确

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