第二节One possible version:Dear Mr. JohnI'm really sorry about my using the mobile phone inyour lecture last week. Please accept my heart-felt apologyfor being so rudeI know any word might sound a made-up excuse. But Ididn't use the mobile phone for no reason. I was trying toapply to some American universities last week and that dayi got an offer and they needed my further information imme-diately. Therefore, I had no other choice but to try sendingthem a text message in class and that was exactly what Iwas doing when you discovered. I promise it will never hap-pen again. But I do need my phone back to get in touchwith others. Will you be kind enough to give it back to meI sincerely hope you can accept my apology and under-stand my situationYour studentLi hu

26.C【解析】据图可知,与蒸馏水处理的对照组相比,用一定浓度的细胞分裂素溶液处理,一段时间内叶片中叶绿素含量较高,故CTK能延缓叶片衰老,而定浓度的脱落酸溶液处理,叶绿素含量较低,两者同时使用则介于两者之间,说明本实验中CTK对该植物离体叶片的作用可被ABA削弱,A、B项正确;由于叶绿素吸收光,将水光解成 NADPH和氧气,根据CTK组比ABA组的叶绿素含量高可知,ABA组叶绿体中 NADPH合成速率小于CTK组,C项错误;据图可推测,施用ABA能加速秋天银杏树的叶由绿变黄的过程;D项正确

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