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简述洋生物有效化学成份的概念和主要的化学成分种类。

答案

参考答案：

概念：指从海洋生物中分离纯化出具有生物活性的天然有机化合物。

种类：

①大环内酯类；

②聚醚类化合物；

③肽类化合物；

④C15乙酸原化合物；

⑤前列腺类似物

完形填空
完形填空。
     There is a park near my home. But I don't go there very often. One afternoon I went into   1    and
found it was really small. In the park, there were  two different ways. One  was wide and clean. There
were   2   flowers on   3   sides.   4 was narrow (狭窄的) and dirty. Wild grass grew everywhere. But
finally I decided to follow the dirty way.
      Ah! There was a small     5    there. It was the most beautiful garden I  had  ever seen. There were
trees,   6   and chairs. I thought  it was    7    part in the park.
      Many people    8     me that there is    9    to see in the park. Now I tell them   10    they follow the
right way, they can feel the difference. When I'm telling them,   11    just smile at me without answering.
I know they don't    12    me. My trip    13    the park that day made  me  understand  something about
    14   . Don't be   15   to choose a different way. Be brave (勇敢). You may get a big surprise!
( )1. A. the school
( )2. A. lots of  
( )3. A. every    
( )4. A. Another  
( )5. A. chair    
( )6. A.bikes      
( )7. A. the best  
( )8. A. tell      
( )9. A. something
( )10.A. if        
( )11.A. we        
( )12.A. know      
( )13.A. to        
( )14.A. study    
( )15.A. happy     		B. the park  
B. a lot      
B. each    
B. Other    
B. lake      
B. flowers  
B. better    
B. told      
B. anything  
B. when    
B. they      
B. believe    
B. of        
B. school    
B. lucky     		C. the zoo    
C. much      
C. all        
C. The other  
C. river      
C. buses      
C. good      
C. tells      
C. nothing    
C. after      
C. I          
C. understand
C. on        
C. family    
C. afraid     		D. the house        
D. any              
D. both              
D. Others            
D. garden            
D.cars              
D. nice              
D. telling          
D. everything        
D. before            
D. you              
D. agree            
D. in                
D. life              
D. worried          
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请问：从对环境有益而言，为什么说乘坐火车、轻轨和公共汽车等公共交通是一种绿色的交通方式？
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