题目

下列做法存在安全隐患的是（ ） A . 炒菜时油锅着火，立即盖上锅盖 B . 厨房内闻到较浓的燃气味，立即关闭阀门并开窗通风 C . 电器着火赶紧用水扑灭 D . 手持燃着的蜡烛进入溶洞游览，发现烛光变弱或熄灭立即退出 答案：C---Could you tell me__________?---I'm not sure. Maybe next week.A. when he came here B. when he will come backC. how long he will live here D. how long he has been here