题目

如图是电解水实验装置． （1） 正极产生的气体是，检验该气体的方法是，电解水的化学方程式为． （2） 净化水的常用方法有：静置沉淀、吸附沉淀、过滤、蒸馏等，单一进行以上操作，净化水的程度最高的是． 答案：【1】氧气（O2）【2】用带火星的木条【3】2H2O {#mathml#}电解__{#/mathml#} 2H2↑+O2↑ 【1】蒸馏 A TV Talk Show—What do you think of TV? Host：Hi，Judy．What do you think of TV? Judy：I think it's a bad and dangerous “idol（偶像）”． Host：How can you say such a thing，Judy? How can TV be dangerous? What do you mean by saying it's an idol? Judy：I mean that it sits in the center of the living room，like a great idol．Think of all the time we waste watching it．And there's no time to collect family news or talk together because we always want to see what's on the box! Host：OK．Let's see what David thinks of TV． David：I don't agree with Judy．Think of all the educational programs．We can learn English，Japanese and lessons in other subjects．Think how helpful these could be．TV also keeps the family together! We stay at home and watch TV and don't go out drinking or dancing．And that saves money，too! 根据短文内容，选择最佳答案。 1．What is the TV talk show about? A．travel．                                                  B．Idols． C．TV．                                                        D．Judy and David． 2．How many people join the show except（除了）the host? A．Second．            B．Two．                C．Three．                  D．Four． 3．Which of the following are Judy’s ideas about TV? ①It always takes a long time for people to watch it． ②There's no time for the family to talk with each other because of it． ③TV is helpful to people． ④We always want to know what's on TV． A．①②③④              B．①②③                C．②③④                D．①②④ 4．What does the underlined word “educational” mean? A．教育的                B．宣传的                C．传统的                D．娱乐的 5．What can we infer（推断）from the passage? A．Judy and David can't mind TV．               B．David doesn't like TV． C．The host loves TV．                                   D．Judy can't stand TV．