2022 英语周报 七年级 HZ 50答案

9.Ⅰ【解析】DNA分子中两条脱氧核苷酸链之间相邻的碱基是通过氢键连接的,一条脱氧核苷酸链上相邻两碱基之间是通过脱氧核糖磷酸脱氧核糖连接的。故选D。

写作Dear TonyYou say you have dimeulty adap ting to the new study and life herelow exactly how you feel.(表示关心) You must be very anxious,butqui te normal since this is your first time to study in a foreig【高分句型-】 Just relax. First, break bearning goaIs into small stepsen get involved in school activities, wherou can make more friends.【高分句型二】(帮他分析原因Hopefully my sugsestions would be helpfum always the person youcan count on提供建议)s t

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