单选题

The substance ______ easily through groundwater, and some communities have experienced acute episodes of water pollution after underground storage tanks ruptured.
[A] perfuses [B] perscusses
[C] percolates [D] perforates
【正确答案】 C
【答案解析】[解析] [C]选项是个超纲词汇，有时需要语感的判断。