问题 填空题

世界卫生组织全面禁止用氯气对饮用水消毒,建议推广使用安全、高效的杀菌消毒剂ClO2.我国最近成功研究出用Cl2

NaClO2反应制取ClO2,同时生成另外一种常见的钠盐,该反应的化学方程式是______.

答案

由化学反应前后元素的种类不变,反应前氯气由氯元素组成,NaClO2由钠元素、氯元素和氧元素组成,可以判断生成物中也含有三种元素:氯元素、氧元素和钠元素,所以另一种物质是氯化钠,方程式是Cl2+2NaClO2═2NaCl+2ClO2

故答案为:

Cl2+2NaClO2═2NaCl+2ClO2

单项选择题
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How the iron of tomorrow (the first Self Clean Iron)can change your lifestyle today?

General Electric introduces the iron of tomorrow. The iron can clean itself. Inside where irons get dirty. Because it cleans itself each and every time you empty it.How? With a push of a magic blue button.

The magic blue button.The first thing you’ll notice that’s different about this iron is the blue button on the side. It’s marked “Self Clean”. Push this blue button, and you can wash out loose mineral deposits  that remain and block up inside. Push this button, and you’ve made life a lot easier.

Less chance of brown spotsSure, Self Cleaning Iron is going to cut down on brown spots. (Those ugly spots that happen on nice, cleanly pressed clothes.) Because a Self Cleaning Iron becomes clean each time you press that magic blue button.Steams much longerCommon sense tells you that if you’ve an iron that blocks less often it has to stay younger for a long period of time. In other words, it steams much longer. That’s another joy of owning General Electric’s Self Cleaning Iron.What does it mean to youToday you are doing so much more than just running a house and running after the kids. You’re working. You’re going to school. It’s all part of your lifestyle. The iron can change that lifestyle. By giving you less trouble before you iron. If we can make it easier for you to be a better wife, a better mother, a better housemaker, we want to. The new Self Cleaning Iron is another one of Home-Makers from General Electric.

Lifestlye.We’re with yours. GENERAL ELECTRIC

9.This passage is ______.

A.an introduction to General Electric     B.an operating instruction of Self Cleaning Iron

C.an advertisement of Self Cleaning Iron  D.a description of the change of lifestyle

10.This iron can clean itself by ______.

A.empting itself                       B.washing out mineral deposits 

C.blocking up mineral deposits          D.giving off more steam

11.According to the passage, what is most likely to attract the customers?

A.It is made by General Electric.            

B.The iron will not produce mineral deposits.

C.There will be fewer brown spots on pressed clothes.

D.Their clothes will be cleaned at the same time.

12.Self Cleaning Iron can help change your lifestyle because ______.

A.you can run your house better         B.you don’t have to run after the kids

C.you can use it while you are working    D.we want you to be a better housemaker