As the industry developing in these years,most of the rivers have been contaminated by sewage （污水）.A:polluted B:downgradedC:mixed D:blackened
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
B:downgraded
C:mixed
D:blackened
参考解析
解析： contaminate：污染，弄脏。题干意思为：近年来随着工业的发展，多数河流被污水污染了。pollute：污染，腐蚀; downgrade：使降低，降级；mix:混合，结合；blacken：使变黑，弄黑。经过比较，pollute与contaminate意思相近，所以选择A。
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