As many as 100 species of fish some to these waters may have been affected by the pollu

问题补充：

As many as 100 species of fish, some to these waters, may have been affected by the pollution．

A. relevant

B. immune

C. unique

D. convenient

答案：

A. relevant

B. immune

(答案→)C. unique

D. convenient

解析：考查单词意思, relevant意思“有关的”， immune意思“免疫的”， unique意思“唯一的”，convenient意思“方便的”，句子意思“多达100种鱼，一些与对于这些水来说是唯一的，可能被污染影响了”，所以选C