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问题 选择题
如图所示，AB是一质量为m的均匀细直杆，A端靠在光滑的竖直墙壁上，B端置于水平地面上，杆身与竖直方向夹角为θ，杆与地面的摩擦系数为μ，保持平衡，则此时杆与地面的摩擦力为（　　）

A．mgtgθ

B．mgsinθ

C．μmg

D．μmg

答案

答案：A

完形填空
完形填空。
     Look at this girl in the picture, she is  1  good friend.  2  name is Lily. She is  3 . She is thirteen. This
is me. My  4  is Li Ling. I'm a Chinese girl. I am one year younger than Lily. We are  5  the same class.
     Lily likes collecting sports things. She  6  a great sports collection. Look, these are her things. She has
10 tennis rackets, 8 baseballs, 6 basketballs, 12 soccers  7  18 volleyballs. But she  8  sports. He  9  likes
collecting sports things. Her brother, David, likes soccer. He plays  10  every day with his friends.
( )1. A. I     
( )2. A. She    
( )3. A. an English 
( )4. A. friend   
( )5. A. in       
( )6. A. is     
( )7. A. and            
( )8. A. don't  like   
( )9. A. no      
( )10. A. football  		B. me       
B. Her     
B. English girl 
B. father    
B. at       
B. are     
B. or            
B. isn't  like     
B. not     
B. basketball   		C. my    
C. My    
C. English  
C. mother  
C. on    
C. has    
C. but    
C. doesn't  like
C. many   
C. baseball  		D. a        
D. His      
D. England  
D. name     
D. for      
D. have     
D. /            
D. am not like  
D. only                        
D. ping pong
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单项选择题 A1/A2型题

可使血糖浓度下降的激素是 （）

A.肾上腺素

B.胰高血糖素

C.生长素

D.糖皮质激素

E.胰岛素
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