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养殖对虾的饲料为什么要添加虾壳粉？

答案

参考答案：

对虾不能合成类胡萝卜素，只能通过食物摄取，虾壳粉含有丰富的类胡萝卜素。

完形填空
完形填空。

     What should we do to keep healthy? One important rule is to exercise    1   . The Fang family try to exercise
every day. Mr Fang    2    exercise in the morning because he must get to work at exactly seven o'clock. But he
runs every evening. He walks a lot,    3   . He walks to school every day, and after school he    4    different
sports with his friends. Mr Fang goes to a yoga (瑜加功) class    5   .
     But it wasn't    6    this way. Last year Mr and Mrs Fang used to (过去常常)    7    everywhere in their car,
even to the drugstore (药店) two blocks (街区) away. They thought they had to use the car all the time. They
wouldn't walk. 
    The Fangs all    8    better now. They believe they shouldn't be lazy. We    9    exercise every day, but we
should try our   10   to exercise as often as possible.

( )1. A. often         
( )2. A. may not       
( )3. A. either        
( )4. A. watches       
( )5. A. in two weeks  
( )6. A. always        
( )7. A. riding        
( )8. A. had           
( )9. A. needn't       
( )10. A. best       

B. sometimes     
B. can not       
B. also          
B. plays         
B. for two weeks 
B. even          
B. drive         
B. make          
B. don't         
B. good          

C. late             
C. would not        
C. too              
C. loves            
C. after two weeks  
C. sometimes        
C. fly              
C. feel             
C. won't have       
C. well           

D. later        
D. should not   
D. again        
D. likes        
D. twice a week 
D. no           
D. walk         
D. feel like                           
D. mustn't      
D. better       
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填空题

内分泌腺没有 ，其分泌物称为 。
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