【正确答案】 C

【答案解析】[解析] 本句话的意思是：那个大湖泊被附近工厂的废水污染了。pollute：污染、弄脏。例如：The violent films pollute the minds of the young men. 暴力电影毒害着青年人的思想。widen：加宽、变宽。例如：The gap between income and expenditure has widened to 11%. 收入和支出之间的差额已扩大到11%。blacken：使变黑。例如：The soldier blackened his face with charcoal. 那名士兵用木炭把他的脸涂黑。mix：混合、使混合。例如：The painter was busy mixing his colours. 画家在忙着调颜色。