2022-2022英语周报高一课标11期答案

2.D【解析】由图可以看出限制酶a和限制酶b切割后产生的黏性末端相同,它们之间能相互连接,A项正确;限制酶a可以把原有DNA切成4段,说明该DNA分子上限制酶a的识别序列有3个,B项正确;限制酶b把2100bp的DNA切成1900bp和20Qbp两个片段,把1400bp的DNA切成80bp和600bp两个片段,说明限制酶b的识别序列至少有2个,仅用限制酶b切割该DNA分子至少可得到三种DNA片段,C项正确;限制酶作用的化学键都是磷酸二酯键,D项错误。

【语篇导读】本文是夹叙夹议文,告诉我们“远亲不如近邻”的道理。8.A【解析】细节理解题。根据第一段 Muckprobably it is a close female friend calling to tell you thatshe has split up with her boyfriend again or perhaps simply that a good movie has just started on TV.可知最有可能来自一个朋友,故选A。9.C【解析】细节理解题。根据第三段 TV shows liktell us that our romantic relationships may not lastwe need to keep in touch with our close friends ifwant to survive.可知 rV shows like friends告诉我们亲密的朋友帮助我们面对生活中的困难。故选C。10.D【解析】推理判断题。根据最后一段 This is trueof Erika and Janes friendship. With Erika's family200 miles away, it is Jane who keeps a spare set of keysto Erikas apartment and waters her plants wheneverhe is away.可知Erka和Jane在日常生活中互相信任和支持。故选D1].A【解析】推理判断题。纵观全文,特别是最后have more to do with my life than ray paents and, therefore, I dont have to spend a lot of timeexplaining things to them. Friends are more up to datwith what is happening.可知远亲不如近邻。故选A

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