问题 选择题

水是纯净物是因为(  )

A.水具有固定的组成、性质

B.能溶解许多物质

C.电解水能生成氢气和氧气

D.自来水可以饮用

答案

A、水具有固定的组成、性质,说明水只有一种构成微粒,说法正确,故A正确.

B、液体的混合物也能溶液多种物资,则不能利用溶解其它物质来判断纯净物,故B错误.

C、只能说明水中有氢和氧两种元素,不能说明水是纯净物,故C错误.

D、自来水可以饮用,但自来水是经过消毒处理的,含有其它微粒,属于混合物,故D错误.

故选A.

阅读理解

阅读理解。根据上文内容判断正(T)误(F)。

     Mrs Jones' telephone number is 2562781 and the number of the city cinema (电影院) is 2562718.

 because the two numbers look the same (一样), some people often make a mistake (弄错)and telephone

  her when they want the cinema.

     One evening, the Jones are having supper at the table. Just then, the telephone bell rings. Mrs Jones

 goes to answer the telephone. A tired (累的) man says, "Excuse me, at what time does your last movie

  begin?"

     "I'm sorry." says Mrs Jones, "But you have the wrong (错误的) number. This is not the cinema."

     "Oh, sorry, it began twenty minutes ago(以前)? Thank you all the same. Goodbye." Says the man.

     Mrs Jones is very surprised (惊讶), so she tells her husband (丈夫) the whole thing. Her husband, Mr

  Jones laughs (笑) and says: "I see. The man's wife wants to go to a movie, but he is tired. He doesn't

 want to go to a movie. So he telephones the cinema. His wife hears (听见) him, but she can't hear you.

 Now they stay at home this evening, and the husband is very happy and he can have a good rest (休息) at

  home."

(      ) 1. Mrs Jones' telephone number is the same as the number of the city cinema.

(      ) 2. People often telephone Mrs Jones when they want the cinema.

(      ) 3. One evening when the telephone bell rings, they are having supper.

(      ) 4. The tired man wants to know when the last film begins.

(      ) 5. The husband is happy to stay at home.

多项选择题