题目内容

9.16.The students visited        a few days ago.
A.a farm               
B.a paper factory
C.a lake
17.The lake provides the people nearby with       .
A.drinking water    
B.dirty water      
C.water only for washing
18.Now the water becomes dirty because      poured dirty water into it.
A.the workers in the factory 
B.the farmers              
C.the students
19.The dirty water makes the sheep and cows       .
A.terrible                            
B.strong
C.ill
20.The factory director said that they will move away the factory       .
A.in three weeks          
B.in two months            
C.in three months.

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