单选题 As many as 100 species of fish, some ______ to these waters, may have been affected by the pollution.
A. unusual B. particular C. typical D. unique

【正确答案】 D
【答案解析】[解析] 各选项的意思为：unusual“不寻常的”；particular“特别的，挑剔的”；typical“典型的”；unique“特有的，独有的”。根据句意可知，答案是D。