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问题 单项选择题 A1/A2型题

常用作保护剂的是（）

A.溴化钾

B.碘化钠

C.碳酸钠

D.氢氧化钾

E.亚硫酸钠

答案

参考答案：E

解析：防止显影剂氧化，稳定显影性能。

完形填空
完形填空

     When Wang Hai went to Yucai Middle School two years ago, he worked hard and did very well in
his lessons. He was also    1    in sports. He ran to school every day to build up his    2   . His parents
were very    3    him and bought him a computer as a birthday present. However, something began to
change. He stopped    4    early and never ran to school any more. He    5    his interest in studying.
     One day in the middle of the night, Wang Hai's mother discovered the cause of the    6   . He played
computer games till midnight. It had a    7    effect(影响) on him and must be stopped. The next day
Mother had a serious talk with Wang Hai.    8    taking the computer away, she told him he was    9   
enough to control himself. Wang Hai was happy he had a wonderful mother and    10    not to do that
again.

( )1. A. worried      
( )2. A. body        
( )3. A. surprised at
( )4. A. getting up  
( )5. A. forgot      
( )6. A. choice      
( )7. A. good        
( )8. A. Instead of  
( )9. A. strong      
( )10.A. printed		B. unusual    
B. legs      
B. strict with
B. putting up
B. lost      
B. change    
B. bad        
B. Instead    
B. weak      
B. protected		C. active    
C. arms      
C. angry with
C. getting on
C. found      
C. chant      
C. useful    
C. Because of
C. old        
C. provided		D. nervous      
D. head          
D. satisfied with
D. putting on    
D. took          
D. chance        
D. useless      
D. Because      
D. young        
D. promised
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选择题

双受精是绿色开花植物特有的受精方式，进行的部位是（　　）

A．子房内

B．花粉管内

C．柱头上

D．胚珠内
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