※ 질문하기질문내용Most fire have a cause that can be clearly seen. A number of forest fires are caused by people. They may not put out camfires, or they may smoke in a careless way.
Some fires are caysed by lightning. Others start from electricity. One kind of fire seems to start without a clear cause. Farmers have always known that the hay in barns must be completely dry before it is stored. Otherwise it may catch on fire by itself.