题目

西红柿汁和柠檬汁能使紫色石蕊试液变红的本质原因是（    ）    A．都属于果汁   B．都是液体     C．都含有碱类物质     D．都含有H+ 答案：答案：D 解析：西红柿汁和柠檬汁都显酸性，紫色的石蕊试液遇到酸性物质变红色，酸性溶液中含有氢离子，属于果汁、液体不是本质原因，属于碱类物质是错误，故选D。第二节 根据对话内容，从对话后的选项中选出能填入空白处的最佳选项，并在答题卡上将该项涂黑。选项中有两项多余选项。（共5小题；每小题2分，满分10分）—(Knocks on the door)Good morning, Madam!—Good morning.—I would like to change your life.—Good!   61 —Are you married? Do you have children?—Unfortunately, I mean fortunately, yes.—  62 Wouldn't you rather spend more time with your family and less doing housework?—That sounds great. But how can I do that?—With the revolutionary new electric knife.—Electric knife?   63 —No, Madam, I'm not. May I show you?—Thank you, but I'm really very busy. You see, my grammar teacher always gives me a lot of homework, and we have a test on Chapter 3 very soon.—  64 You can't find this knife in any store. Today and only today I can give you a special price.—  65 —But Madam, you will regret this! (The door closes loudly in his face.)A．Goodbye.B．You must be kidding!C．That's much too expensive.D．You are making a big mistake.E．My life must use a few changes.F．I can believe what you are saying.G．Then, you must be extremely busy.