题目

句型转换【1】He has to do some homework in the classroom before leaving school.(一般疑问句）_______ he ________ to do any homework in the classroom before leaving school?【2】She's already back to China.(改否定句）She ________back to China ________.【3】I think Politics is more difficult than History.(同义句转换）I don't think Politics is ________ ________ as History.【4】I can finish the report on food safety in two days.(对划线部分提问）_______ ________ can you finish the report on food safety?【5】Don't be late for school next time, ________ ________?(根据下图回答问题：（6）（1）促进根、茎生长的生长素溶液最适浓度依次是    、      。（2）分析10-4mol／L的生长素溶液对根、芽、茎的影响，得出结论是                                              ；分析10-10mol／L—10-6mol／L的生长素溶液对根的影响，得出结论是                                              。（3）从三条曲线可以看出，对生长素最敏感的器官是           。（4）若想培养出无根豆芽，配制的生长素溶液的最适浓度是             。