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问题 单项选择题

函数y=-3x+4（x∈R）的反函数是（）．

A.选项A

B.选项B

C.选项C

D.选项D

答案

参考答案：B

解析：

因为y=-3x+4，所以，即原函数的反函数为故选B．

完形填空
完形填空。
     The students in Shanghai No.3 Girls High School have a flower-arrangement (插花) lesson every week.
The course is the    1    of its kind among middle schools in Shanghai. It's a new start. It helps the students
to enjoy the    2    of flowers better. That's    3    the course has become very popular among the students.
     The teachers of the course are all    4    trained. They are good at this art and work hard at passing on
the skill    5    students. So far, many stuendts in the school    6    a lot of prizes in this field. In order to
further    7    the stuents' skill, the teachers usually play    8    while stuents are arraging flowers. Stuendts
   9     the music, then they    10    more good ideas for flower-arrangement.
     Besids, the teachers teach the stuents other skills at the same time, for example, they ask the students 
   11    compositions about flower. In the way, students not only get art education but also improve    12    
writing skills.
     Several months ago, some foreigners    13    visited the school. When they saw common flowers become
more    14    and meaningful, they got amazed and intereted. They made    15    and would play them for their
own studentd after they returned home.

(     ) 1. A. first          
(     ) 2. A. color          
(     ) 3. A. how              
(     ) 4. A. clearly        
(     ) 5. A. with           
(     ) 6. A. win            
(     ) 7. A. drop           
(     ) 8. A. music          
(     ) 9. A. are  angry  with
(     )10. A. come up with  
(     )11. A. always        
(     )12. A. write         
(     )13. A. their         
(     )14. A. ugly        
(     )15. A. plans         

B. second            
B. beauty           
B. when               
B. specially       
B. for               
B. won              
B. decide            
B. games               
B. are pleased  with 
B. run  out of       
B. never              
B. writing          
B. your              
B. lively             
B. notes           

C. last             
C. smell               
C. why                  
C. politely        
C. to                 
C. have  won         
C. develop              
C. jokes                  
C. are  afraid of    
C. hold  on  to      
C. hardly               
C. to write          
C. our               
C. lonely            
C. videos          

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单项选择题 A3/A4型题

患儿，8岁。上前牙自发痛，冷热刺激加重。深龋，探痛，叩（+），未见穿髓孔，温度测敏感，不松动，牙龈未见异常。

治疗方法宜选择（）

A.安抚

B.根管充填

C.开放引流

D.活髓切断术

E.根尖诱导成形术
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