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