单选题 The bags used to hold water are likely to be damaged by ______.

【正确答案】 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,使用寿命可以更长。据此可知,袋子有可能被太阳光破坏,所以选D。