问题 填空题

现有A、B、C、D四种物质,已知:A和B为黑色固体,C和D为无色气体;A和B在高温下能反应产生D;A和C在加热条件下反应能产生D;B和D在高温条件下能产生C;B和C都具有可燃性,它们燃烧的产物均为D.

(1)写出各物质的名称:A______、B______、C______、D______;

(2)试写出下面反应的化学方程式:①A和B______.②C燃烧______.

答案

(1)B是黑色固体,具有可燃性,可知B就是碳,燃烧产物是D为二氧化碳,C是无色的气体,具有可燃性,产物是二氧化碳,所以C就是一氧化碳,黑色固体A和碳反应会生成二氧化碳,所以A就是一种氧化物,氧化物是黑色的只能是氧化铜,所以A就是氧化铜,故答案为:氧化铜、碳、一氧化碳、二氧化碳,

(2)①碳和氧化铜在高温的条件下生成铜和二氧化碳,故答案为:C+2CuO

 高温 
.
 
2Cu+CO2

②一氧化碳和氧气在点燃的条件下生成二氧化碳,故答案为:2CO+O2

 点燃 
.
 
2CO2

阅读理解

阅读理解。

     " Cool " is a word with many meanings. Its old meaning is used to express a temperature that is a little  bit cold. As the world has changed, the word has had many different meanings.

     " Cool " can be used to express feelings of interest in almost anything.

     When you see a famous car in the street, maybe you will say, "It's cool . " You may think, "He's so       cool,"when you see your favourite footballer.

     We all maximize(扩大)the meaning of "cool". You can use it instead of many words such as     

" new "or " surprising ". Here's an interesting story we can use to show the way the word is used.

A teacher asked her students to write about the waterfall (瀑布)they had visited. On one student's

paper was just the one sentence, "It's so cool. " Maybe he thought it was the best way to show what he

saw and felt.

     But the story also shows a scarcity(缺乏)of words. Without "cool", some people have no words to

show the same meaning. So it is quite important to keep some credibility (可信性). Can you think of many other words that make your life as colourful as the word "cool"? I can . And I think they are also very

cool .

1. We know that the word " cool " has had _____

A. only one meaning       

B. no meanings

C. many different meanings       

D. the same meaning

2. In the passage, the word " express " means "_____"

A. see   

B. show   

C. know    

D. feel

3. If you are _____ something, you may say, "It's cool."

A. interested in                 

B. angry about   

C. afraid of                     

D. unhappy with

4. The writer takes an example to show he is ____ the way the word is used.

A. pleased with                         

B. strange to

C. worried about                   

D. careful with

5. In the passage, the writer suggests(暗示)that the word " cool " _____

A. can be used instead of many words   

B. usually means something interesting

C. can make your life colorful

D. may not be as cool as it seems

单项选择题