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问题 选择题

解剖发现，脊椎动物的心脏有四类：①一心房一心室；②二心房二心室；③二心房一心室；④二心房一心室，但心室中有不完全间隔。根据生物进化的基本规律推断，脊椎动物心脏进化的顺序应该是[ ]

A．①→②→③→④

B．②→③→④→①

C．①→③→④→②        

D．②→④→③→①

答案

答案：C

完形填空
完形填空。

    When I was three years old just before my sister was born, my mom asked me what we should name the
new baby. I said, "Let's call   1   Gravy!"
    Having a sister   2   my life. When my sister and I played together, we   3   got into fights and got angry
with each other. It sometimes drove our parents crazy.   4   at the same time, we learned to share our things
and forgive (原谅) each other when we got angry.
    In North America,   5   families have a boy and a girl. Of course, some have three or more. However, in
China,most children don't have brothers or sisters, and they have to learn those things in other ways, which
is more   6  .
    When I moved away to university, my sister   7   me she wished I still lived with her. She wasn't used to
getting all the attention   8   my parents. But Chinese children get attention for all their life!
    Some middle school   9   in China wish they had a brother or sister.  10  you are one of them, I have a
good idea for you. Treat your friends and classmates as your brothers and sisters!

( )1.A.her       
( )2.A.began     
( )3.A.never     
( )4.A.But       
( )5.A.few       
( )6.A.beautiful 
( )7.A.asked     
( )8.A.from      
( )9.A.students  
( )10.A.When       		B.him      
B.saw      
B.hardly   
B.So       
B.several  
B.difficult
B.answered     
B.in       
B.teachers 
B.If        		C.me         
C.changed    
C.seldom     
C.Or         
C.no         
C.careful        
C.told     
C.to    
C.workers 
C.Unless    		D.them      
D.enjoyed   
D.often     
D.And       
D.most                        
D.friendly  
D.warned    
D.for       
D.lovers    
D.Though  
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多项选择题

可以抵押的财产主要有（）。

A.房屋

B.机器

C.土地

D.商业票据

E.专利权
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