As the industry developing in these years,most of the rivers have been contaminated by sewage (污水).
A.polluted
B.downgraded
C.mixed
D.blackened
正确答案是A
As the industry developing in these years,most of the rivers have been contaminated by sewage (污水).
A.polluted
B.downgraded
C.mixed
D.blackened
正确答案是A