影响酶催化反应速率的因素有温度、反应物浓度、酶的浓度等。下图表示在最适温度下，某种酶的催化反应速率与反应物浓度之间的关系。有关说法正确的是

下列年代尺上展示了***领导中国革命和建设的奋斗历程．

请根据图示回答下列问题：

小张的姐姐在淘宝网上开了一家网店，她坚持认为：信用度应该由货真价实的商品和优质的服务来获取。她的店铺获得了广大买家的一致好评，卖出的商品每月都在增加。这告诉我们（　　）

①信任的基础永远是诚实                                                                           ②只要讲诚实，就一定能获得成功　

③“做老实人，办老实事”是个人得以立足、事业得以成功的保证　    ④诚信原则要求我们放弃个人利益

A

    Hi! I'm Alan Miller．I'm an English boy．I'm 12．I'm in Grade Seven．My parents work in Tianjin now．My father is a teacher and my mother is a doctor．I have a brother, John．We are students in a middle school in Tianjin．He is 14 and he is in Grade Nine．We are in the same (相同的) bedroom．He puts his things in their right places，but my things are everywhere．

    Hello! My name is Zhou Wen．I am a Chinese girl．I'm 13．I'm a student of Grade Seven．Now I live in Beijing with my parents．My father is a doctor．My mother is a teacher．She teaches English in a school．My sister Zhou Xue is 3．She is with my grandparents．They are in Tianjin．My grandparents look after my sister．

根据材料内容选择最佳答案。