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问题 单项选择题

NOAH软件上的AC代表（）。

A.气导测听

B.骨导测听

C.掩蔽

D.不舒适阈

E.言语测听

答案

参考答案：A

完形填空
完形填空。
A: Tomorrow is   1  . We don't have to go to school and let's have a picnic.
B:   2  !   3   can we go?
A: To the   4 .
B:   5 , there are too many people at the beach. Let's go to the park.
A: How do we   6  there?
B: By bus.   7  is one at nine o'clock.
A:   8   do we meet?
B: Eight thirty at the bus stop. And I want to bring some   9  .
A: Then let  10  bring something to drink.
( )1. A. Monday    
( )2. A. Great    
( )3. A. How      
( )4. A. park     
( )5. A. No       
( )6. A. walk     
( )7. A. The bus  
( )8. A. How       
( )9. A. chicken and dumplings   
( )10. A. you                     		B. Saturday    
B. Oh dear     
B. When        
B. zoo         
B. Ok          
B. get          
B. He          
B. When         
B. desks and chairs   
B. him               		C. Wednesday    
C. Well        
C. Why            
C. shop         
C. That's right  
C. come           
C. It           
C. Where  
C. books and pens     
C. me                 		D. Thursday             
D.Thank goodness       
D. Where               
D. beach                
D. Yes                
D. run                  
D. There                
D. When and where
D. water and porridge   
D. her                  
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问答题

自由市场经济往往会出现市场失灵问题。
(1)说明市场失灵的含义。
(2)用两个实例说明产生市场失灵的原因。
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