英语周报八上人教版新目标答案

第三节书面表达One possible version:Dear PeterHow about your life? I am writing to convey my grati-de for your kind help and care during my stay in yourcountry, without which I wouldnt have enjoyed itmuchGuided by you, I had a chance to visit some places ofinterest in England and experience such unique culture aswell as beautiful scenery. Thanks to your generous help, Ido believe that I have a better understanding of your countryand culture. What's more, during the week, the comfortable room, delicious meals and especially your friendlyfamily made me feel at homeI will be more than pleased if I have the opportunity to"repay your kindness. I will show you around in China. I amlooking forward to your coming.YoursLi H

30.B【解析】S型的DNA不会被蛋白酶水解,可以进人R型菌使其转化为S型菌;S型的DNA会被DNA酶水解,不能进入R型菌使其转化为S型菌;65℃条件下DNA酶失活,S型菌的DNA不会被水解,可以进人R型菌使其转化为S型菌:65℃条件下蛋白酶失活,S型菌的DNA也不会被蛋白酶水解,可以进入R型菌使其转化为S型菌。故选B

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