厅门锁钩头应留有（）mm活动间隙，但锁钩啮合深度应大于等于（）mm。

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 for the passage?

A. Sing in the Bar            

B. Achieve Success in Life

C. Never Lose Heart          

D. Find Your Hidden Talent

下列属于原发性心肌病的是（）

A.先天性心肌病

B.瓣膜病

C.高血压

D.冠心病

E.扩张型心肌病

呼吸深度的维持取决于哪脏的功能（）

A.心

B.肾

C.脾

D.肝

E.肺

德育的基本途径是( )

A．政治课和各科教学

B．班主任工作

C．社会实践活动

D．共青团和少先队活动

对于企业的股东来说，有形资产净值务率应该是越来越有力。