人教版九年级下册英语分层训练Unit13SectionA答案

【知识单一性训练】
Ⅰ.1. litter  
2.bottom  
3.advantage  
4.cost  
5.plastics
6. methods  
7.cruel  
8.industry  
9.law  
10. afford
Ⅱ. 11. fishermen    
12. ugly    
13. wooden    
14. methods
15. harmful    
16. transport    
17. cruel    
18. law
19. related  
20. pollution
Ⅲ.

Ⅳ. 31. solve the problem    
32. make much difference to
33. lead to 
34. be able to  
35. Is,in danger