要求填料必须是（）好

阅读理解。

     John lived with her mother when he was young.  He didn't know who his father was. The woman did

some washing for the 'rich and could buy onl'y some bread for her son. So the boy was short and thin.

     One cold morning there was much snow in the streets. A car knocked the woman down and the

policemen took her to the hospital.  She didn't tell John that his father deserted (遗弃) her before he was

born until she died.  She left her son the name and address of his father.

     John found his father, Mr.  Brown, in another city.  He was one of the richest shopkeers and he had

to receive his son.  From then on the boy lived a rich life.  He ate all kinds of delicious food and wore

beautiful clothes.  But he didn't go to school and could not read or write.

     Once his father took him to a party.  He saw a newspaper lying on the floor and picked it up while

others were talking about a film.  He had a look at it and found a car's wheels (轮子) were upward

(向上). He called out,  "Oh, dear! An accident.

     All the people were surprised and began to read the newspaper.  But soon they all began to laugh.  

Do you know why?

1. John didn't know his father because___________.

A.  the man was rich            

B.  the man deserted his mother

C.  his mother left the man      

D.  the man didn't like him

2.  John was short and thin because___________.

A.  he didn't like sports

B. his parents were short, too

C.  he was often hungry when he was young

D. his mother never gave him food

3.   The woman told John who his father was___________.

A.  after she was knocked down by a car    

B.  before her son left

C.  before she was in hospital                

D.  before she died

4.  After John found his father, ___________.

A.  he was angry with the man  

B.  he started a rich life

C.  he wouldn't live with him    

D.  the man was bad to him

5.  The people at the party laughed at him because                        .

A. he held the newspaper upside down  

B. he wasn't polite

C. the newspaper was yesterday's        

D. he wasn't clever

利用生物（如动物）做“生产车间”，生产人们所需要的某些物质，这就是生物反应器，目前人们认为动物中最理想的一种生物反应器是“______”．

简述焊条药皮在焊接中所起的作用。

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单根皮下埋植剂孕激素的含量是（）。

A.28mg

B.48mg

C.68mg

D.88mg