问题 填空题

下表是部分物质的溶解性表(20℃),利用表中提供的信息回答下列问题:

(1)NaOH和Ba(NO3)2两种溶液混合后能否发生反应?理由是什么?________________。

(2)写出一个有BaSO4生成的复分解反应的化学方程式。___________________。

答案

(1)不能,没有沉淀、气体或水生成(或不符合复分解反应发生的条件)

(2)Na2SO4+Ba(OH)2==BaSO4↓+2NaOH等答案合理均可

阅读理解

阅读理解

     Once there was a piano player in a bar(酒吧). People came just to hear him play. But one night, a

lady asked him to sing a song. "I don't sing,"said the man.

     But the lady told the waiter, "I'm tired of listening to the piano. I want the player to sing !"

     The waiter shouted across the room, "Hey, friend! If you want to get paid, sing a song!"

     So he did. He had never sung in public before. Now he was singing for the very first time! Nobody

had ever heard the song Mona Lisa sung so beautifully!

     He had talent(天赋) he was sitting on! He may have lived the rest of his life as a no-name piano

player in a no-name bar. But once he found, by accident, that he could sing well, he went on working

hard and became one of the best-known singers in the US. His name was Nat King Cole.

    You, too, have skills and abilities. You may not feel that your talent is great, but it may be better than

you think. With hard work, most skills can be improved.  Besides, you may have no success at all if you

just sit on your talent.

1. The lady asked the player to sing a song because _       .

A. she had paid him for this                    

B. she knew him very well

C. she wanted to have a change                  

D. she enjoyed his singing

2. Nat King Cole succeeded because _       .

A. the lady helped him a lot                    

B. he caught the chance

C. he continued to play in the bar                

D. he stopped playing the piano

3. The words "sit on"  in the passage probably mean "_       "

A. fail to realize                                

B. forget to use

C. try to develop                            

D. manage to show

4. From the story we know if you have some talent, you should _      

A. hide it and wait                        

B. ask others for help

C. pay no attention to it                    

D. work hard to improve yourself

5. Which could be the best title(标题) for the passage?

A. Sing in the Bar                            

B. Achieve Success in Life

C. Never Lose Heart                          

D. Find Your Hidden Talent

单项选择题