Paragraph Three Consumers of electricity usually accept the fact that power cuts frequently occur during thunderstorms. If outages occur on a sunny day, consumers will blame the power company. However, most outages occur due to circumstances beyond the power company’s control. Animals with the ability to reach the top of power poles can knock out power of many houses. 38. Various c___________of power failure.
【正确答案】：causes
【题目解析】：原文讲的是断电的各种原因，有时是因为雷雨，有时是电厂，有时是动物损毁电线。所以我们总结为断电的各种原因，因此填causes。
