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问题 选择题

在制作凉菜时，加入食盐，会发现盘中的汁液增多了，这些汁液主要来自细胞中的（　　）

A．细胞壁

B．细胞膜

C．细胞核

D．液泡

答案

A、细胞壁位于细胞的最外面，起到保护和支持作用，不符合题意．

B、细胞膜能控制物质的进出，也有保护作用，不符合题意．

C、细胞核内含遗传物质，对生物的遗传具有重要的意义，不符合题意．

D、液泡中含有细胞液，有各种味道的物质以及营养物质，如各种蔬果汁中含各种有味道的物质以及丰富的营养物质，就是来自于细胞中液泡的细胞液，符合题意．

故选：D

单项选择题

X线平片上，肾结石可以表现为()

A．圆形

B．卵圆形

C．桑椹形

D．鹿角形

E．以上都可
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     On the first day of my school life in the USA, I showed a great interest in my marketing class. My
teacher, Mrs. Tolman, suggested I  __1__  a national marketing club called DECA attracting many
students with talent and interest in  __2__. So I did.    
     The first  __3__  was to raise money for the marketing competition later in the year by selling
candles. Mrs. Tolman said the competition was due in a week and that 40 percent of the  __4__ would
go into my personal account.    
     At the beginning, I tried to sell some candles to my host mom. She said that if I could   __5__  
confidence and do a wonderful sales presentation, she would certainly buy some. I started my  __6__    
with a firm handshake. Then I introduced all the different kinds of candles and the special sales I could
offer and  __7__  her that our candles were the best choices for gifts and home decorations. Finally
she bought three candles.    
     Greatly  __8__  I decided to sell my candles around the neighborhood. On Saturday morning, with
great courage, I knocked at the door of my first potential  __9__.    
     "I'm a student at Skyline High School and we are __10__  money for DECA. I'm trying to sell..."  
      "Not today, sorry, "  the man interrupted me and __11__  the door.    
     Embarrassed, I walked away and said to myself the __12__ thing that might happen was being
refused like that again. I couldn't even count how many times I was __13__  with reasons like "Not
today" , "I don't have any __14__ money right now" or "I just bought some". __15__, I had to continue
with the day. __16__, a woman kindly bought nearly  $ 60 worth of candles. I couldn't even hide my 
__17__  and said "Thank you very much" to her with a bow.    
     After a  __18__  hard work, I turned in my $408 worth of sales of candles, which gave me $163 in
my own account. I was __19__  to find out I was the second highest seller in all classes.    
     It was the first time that I had worked as a sales person. This experience let me know that __20__ 
difficulties was only wasting time and a barrier in my way to success.

( )1. A. hold          
( )2. A. business      
( )3. A. chance        
( )4. A. income        
( )5. A. express      
( )6. A. presentation  
( )7. A. told          
( )8. A. puzzled      
( )9. A. buyer        
( )10. A. lending      
( )11. A. opened      
( )12. A. worst        
( )13. A. allowed      
( )14. A. more        
( )15. A. However      
( )16. A. So          
( )17. A. anger        
( )18. A. week's      
( )19. A. puzzled      
( )20.A. overcoming  		B. join          
B. English        
B. way            
B. candles        
B. show          
B. business      
B. convinced      
B. surprised      
B. seller        
B. raising        
B. knocked        
B. uneasy        
B. permitted      
B. extra          
B. So            
B. Secondly      
B. embarrassment  
B. hour's        
B. surprised      
B. dealing with   		C. build        
C. math        
C. challenge  
C. business    
C. make        
C. club        
C. explained    
C. shocked      
C. business man
C. returning    
C. burst into  
C. best        
C. refused      
C. little      
C. Therefore    
C. Firstly      
C. happiness    
C. year's      
C. calm        
C. accepting    		D. set          
D. sports        
D. choice        
D. expense      
D. expect        
D. interest      
D. requested    
D. encouraged    
D. shop keeper  
D. borrowing    
D. shut          
D. unhappiest    
D. demanded      
D. left          
D. For          
D. Finally      
D. sad          
D. month's      
D. lucky        
D. worrying about
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