2022英语周报 ab答案

应用文写作@One possihle version:Dear EricI'm writing to express my sincere gratitude to you for helping me create a personal website last saturday.After learning about my difficulty in creating a personal website, you offered guidance to me. First of allyou taught me the steps of creating a personal website in detail. Then you told me what I should pay attention toin this process. Whenever I had a problem, you explained it to me carefully and patiently. Finally, with yourhelp, I succeeded in creating my own website. In addition, you gave me some tips on Internet safety.Many thanks again for your help. I hope that I'll learn more relevant knowledge from you.Yours

32.(7分,每空1分)(1)色氨酸非极性(2)直立没有尖端不能感受单侧光,不影响IAA的分布,IAA运输到下部,促进细胞伸长生长(3)无(外源)乙烯IAA浓度低当IAA浓度增高到一定值就会促进乙烯的合成,乙烯含量增加,从而增大了细胞膜的透性【解析】(1)略(2)由于幼苗没有尖端不能感受单侧光,不影响IAA的分布,琼脂块中的IAA运输到下部促进细胞伸长生长,因此幼苗将直立生长,(3)根据A曲线可知,在无外源乙烯和IAA浓度低时,IAA对细胞膜透性的影响不显著。B组加乙烯处理后,随IAA浓度的提高,叶片细胞膜透性显著增加,与A组高浓度处理变化趋势具有平行关系,对这一实验现象提出的合理假说是:当IAA浓度增高到一定值后,就会促进乙烯的合成,乙烯含量增加,从而增大了细胞膜的透性。

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