关于家庭电路和安全用电，下列选项中正确的是（ ）
A：家庭电路中必须安装保险丝或空气开关
B：在未断开电源开关的情况下更换灯泡
C：我国家庭电路的电压值为380V
D：用湿布擦拭正在工作的台灯
东南亚有丰富的旅游资源，下列旅游景点属于越南的是（ ）
—No, you _____. You come a little later.
Our government has tried many ways to the smog(雾霾)problem. Maybe we'll have a clear sky in the near future.
