第12题: [单项选择]The bags used to hold water are likely to be damaged by ______. A. mosquito insects B. a fitted cover C. a first-flush device D. sunlight 参考答案:D 答案解析:第五段最后一句However,if the bags are not damaged by sunlight,they could last even longer。然而,如果袋子没有受到阳光破坏的话