单选题
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
【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。
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