实体经济与电商领域历来被视为水火不容的竞争关系，但在近年的“双十二”促销活动中，格力电器董事长董明珠率领格力官方商城与京东创始人刘强东携手推出“董东联合”却获得了良好的市场效益。实体经济为电商提供质量保证和实物体验，电商为实体经济拓展市场空间和广告效应，“互联网＋”与供给侧首例跨界合作成功体现的哲理是（    ）

①矛盾斗争性是推动事物发展的动力

②整体的功能大于部分的功能之和

③事物的价值变化是具体的和有条件的

④矛盾双方的同一以差别和对立为前提

把下列句子改成陈述句。

C

     There are many festivals at our school. This month is October. In October there is a sports festival. We have the volleyball game and the basketball game during(在……期间) the festival. On October 15th，there is an English festival. On that day we have an English speech contest(演讲比赛)．On October 19th，we have a school trip. We go to Beijing with the teachers. On the last day of this month，there is a music festival. On that day we can enjoy beautiful music. It's really wonderful. Next month，there is an art festival. Students often display(展示) their pictures on that day.