题目

下列关于生命系统和细胞学说的叙述，错误的是：A. 病毒是一种生物，但病毒不属于生命系统B. 细胞学说揭示了生物界和非生物界的统一性C. 蓝藻和酵母菌在结构上都有细胞壁、核糖体等D. 培养皿中的大肠杆菌菌落属于生命系统的种群层次 答案：【答案】B【解析】生命系统结构层次从小到大为：细胞、组织、器官、系统、个体、种群、群落、生态系统，细胞是最基本的生命系统，生物圈是最大的生命系统，由于病毒没有细胞结构，因此不属于生命系统层次。细胞学说的主要内容之一是“动植物都是由细胞构成的”，揭示了细胞统一性和生物体 从方框中选出适当的句子补全对话A: Good morning! Can I help you?B: Yes, please. I'm looking for a mobile phone, but I have no idea.A: We've got all kinds of mobile phones here. Which do you prefer, Siemens or Motorola?B: I really know little about them. Which one sells better these days?A: Um… __1__B: How much is a Motorola?A: __2__ The newer, the more expensive.B: __3__ A: What about this one? It looks nice and works well.B: __4__ A: 1, 000 yuan.B: __5__ That’s the best we can do. OK?A: OK.B: Thank you. A. Motorola is more popular, I think.B. I want one, newer but not too expensive.C. I have to ask for 900 yuan.D. What’s the matter with you?   E. What type would you like?  F. My mobile phone is Motorola.