考博考试

【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

网考网参考答案：D
网考网解析：
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。 查看试题解析出处>>