题目

Mrs Black is sixty-nine years old. She has only a daughter named Sandra. Mr Black died twelve years ago. She was very sad and lived in her house alone. Two years later her daughter had a baby. The woman was busy all the time and no time to look after her son James. She asked her mother to live with with them.The old woman had to sell her house and moved there. She was strong and could do all the housework. And the family liked her.Last autumn Mrs Black went to do some shopping. A car hit her and her leg was hurt. She had to be in hospital for three months. She couldn’t do anything after she （2013?岱岳区模拟）下列做法中符合安全用电的是（　　）A．开关可以接在电灯和零线之间B．当电路中增添大功率用电器时，只有更换额定电流更大的保险丝C．带有金属外壳的用电器使用时必须接地D．使用试电笔时，手千万不要接触笔尾金属体