问题 选择题

下列关于铜电极的叙述,正确的是

A.铜锌原电池中铜为负极,发生氧化反应

B.用电解法精炼粗铜时,粗铜作阴极

C.在镀件上电镀铜时,可用精铜作阳极

D.电解稀H2SO4制H2、O2时,可用铜作阳极

答案

答案:C

A中应是Zn为负极,B中粗铜为阳极,D中Cu作阳极易失电子能不断溶解,因而没有氧气生成。

阅读理解

阅读理解。

      An artist went to a beautiful part of the country for a vacation, and stayed with a farmer.

      Every day he painted from morning to evening, and then when it got dark, he went back to the farm

and had a good dinner before he went to bed.

      At the end of his vacation he wanted to pay the farmer, but the farmer said,"No, I don't want money-

but give me one of your pictures.  What is money? -In a week it will be all over, but your painting will still

be here with me. "

      The artist was very happy and thanked the famer for saying such kind things about his painting.

      The farmer smiled and answered, "It's not like that. I have a son in London.  He wants to

be an artist. When he comes here next month, I will show him your picture, and then he won't want to be

an artist any more, I think. "

1. The artist went to the beautiful part of the country______.

A. to see a friend

B. to visit the farmer

C. to go on vacation

D. for nothing

2. What did the artist do there every day?

A. He had a talk with the farmer.

B. He took a walk in the country.

C. He did nothing but ate a good dinner______.

D. He painted.

3. The farmer wanted .

A. to get more money from the artist______.

B. the artist to teach his son

C. to get a picture from the artist

D. the artist to stay longer with him

4. The farmer______.

A. enjoyed the artist's pictures very much

B. didn't think the artist's pictures were good

C. had too much money

D. liked his own farm

5. The best title of this passage is______.

A. A Happy Vacation

B. A Terrible Painting

C. A Great Painting

D. How to Be a Farmer

填空题