睡眠时相中睡得最浅的一期是()A．慢波睡眠第1时相 B．慢波睡眠第2时相 C．慢波睡

     Let me tell you my penfriend Ivan. He is 12 years old. He likes playing football. He usually plays

football with his friends at weekends.    

     Ivan lives with his father and mother in a city in France. They have a home with five rooms, a

swimming pool and a garden. They often have a party in the garden at weekends. They like to help

their neighbours. His home is not near his school, so Ivan takes a bus for an hour and then walks for

10 minutes to school. There is a Basketball Club near his school. He likes playing basketball in the club.    

     Ivan's father is a worker. He is busy. Ivan's mother is a doctor. She is nice to the patients. Ivan

to be a teacher when he grows up.1 want to be a teacher, too. Every month Ivan writes two letters

to me. He'll come to China next year. We'll meet then.

1. How old is Ivan now? 

A. He is 11.      

B. He is 12.        

C. He is 13.          

D. He is 14.

2. What are Ivan's hobbies? 

A. Basketball and swimming.            

B. Football and basketball.  

C. Football and swimming.              

D. Reading and swimming.

3. How often does Ivan write to me?  

A. Twice a month.  

B. Twice a week.    

C. Every day.    

D. Every week.

4. Ivan studies in ________ now.  

A. America        

B. China            

C. France        

D. Japan

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

A. How To Make Penfriends              

B. Something About Ivan

C. What Is Ivan's Home Like              

D. Ivan's School Life

16岁女孩，左小腿上段肿胀疼痛半年，近1个月来肿胀明显，夜间痛明显。查体：左胫骨上端肿胀严重，压痛明显，浅静脉怒张，扪及一6cm×7cm硬性肿块，固定，边界不清。X线片示左胫骨上段呈虫蚀状溶骨性破坏，骨膜反应明显，可见Codman三角。最可能的诊断是（）

A.左胫骨慢性骨髓炎

B.左胫骨软骨肉瘤

C.左胫骨骨巨细胞瘤恶变

D.左胫骨骨肉瘤

E.左胫骨骨软骨瘤恶变

简述撤销邀约的限制？

适用于不锈钢管道法兰连接的形式有( )。

A．焊接法兰

B．焊环活套法兰

C．翻边活套法兰

D．承插式法兰

我国现行税法规定，对于某些用外购已缴纳消费税的应税消费品连续生产出来的应税消费品，在计算征收消费税时，允许扣除外购应税消费品已纳的消费税税款。其计算依据是( )。

A．购进数量

B．生产领用数量

C．生产出来的应税消费品的耗用数量

D．已出售的应税消费品的耗用数量