9D【解析】本题考查植物激素与植物生长调节剂的作用特点和实验设计。该实验的自变量为溶液种类,需要一个空白对照即甲组,故表中“?”处理方式为清水处理,A正确:若实验用的NAA浓度为m,则改用低于m浓度的NAA时,有可能更接近最适浓度,故胚芽鞘长度可能增加,B正确;由乙、丙、丁三组实验结果可知,NAA与GA3混合处理要比分别用它们单独处理对胚芽蔚长度的促进作用更强,说明二者具有协同作用,C正确;NA是植物生长调节剂,是由人工合成的,D错误。

第三部分写作第一节【写作提示】1.审题:(1)人称以第三人称为主;(2)时态:以一般现在时和一般将来时为主;(3)体裁:书信类应用文。2.写作要点:(1)保持均衡饮食;(2}保证充足睡眠;(3)保持适量运动。【参考范文】Dear editor,On: Hearing that you will start a health column, I'm writing to share myinions about how to keep healthyIt is important to have a balanced diet, which will make us strongand energetic. Enough sleep is of equal importance, because it will allowour body to readjust and gain energy for the next day. Only when we haveenough sleep can we get fully refreshed. In addition, proper exercise mustbe done. Taking exercise will build up our strength, and get us relaxed.Rome was not built in a day. I sincerely hope you will find theseproposals helpfulYoursLi Hua【点评】本文要点齐全,条理清晰。首段开门见山,陈述写信的目的第二段详细介绍为该健康专栏提供的保持健康的建议,并给出理由在遣词造句方面,范文使用了多处高级词汇和句式,为文章增色不少,如 balanced, build up, proposal以及 which引导的定语从句( whichwill make us strong and energetic)、 because引导的原因状语从句( because it will allow…)、倒装句( Only when we have enough sleep canwe get.)、“疑问词+不定式"作宾语( how to keep healthy)、"make+宾语+宾补”结构( make us strong and energetic)等。

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