请写出一个以x=2y=-1为解的二元一次方程：______． 发布时间：2017-04-19 22:09 │ 来源：www.tikuol.com 题型：填空题 问题： 请写出一个以x=2y=-1为解的二元一次方程：______．
题型：填空题 阅读理解。 We walked in so quietly that the nurse at the desk didn't even lift her eyes from the book. Mum pointed at a big chair by the door and I knew she wanted me to sit down. While I watched, mouth open in surprise,Mum took off her hat and coat and gave them to me to hold. She walked quietly to the small room by the lift and took out a wet mop (拖把). She pushed the mop past the desk and as the nurse looked up, Mum nodded and said," Very dirty floors." "Yes, I'm glad they've finally decided to clean them." The nurse answered, she looked at Mum Strangelyand said, "But aren't you working late?" Mum just pushed harder, each swipe of the mop taking her farther and farther down the hall. I watcheduntil she was out of sight and the nurse hand turned to writing in the big book. After a long time Mum came back. Her eyes were shinning. She quickly put the mop back and took myhand. As we turned to go out of the door, Mum bowed politely to the nurse and said, "Thank you." Outside, Mum told me, "Dagmar is fine. No fever." "You saw her, Mum?" "Of course. I told her about the hospital rules, and she will not expect us until tomorrow. Dad will stop worrying as well. It's a fine hospital. But such floors! A mop is no good. You need a brush." 1. When she took a mop from the small room what Mum really wanted to do was _____. [ ]A. to clean the floor B. to please the nurse C. to see a patient D. to surprise the story-teller 2. After reading the story what can we infer about the hospital? [ ]A. It is a children's hospital. B. It has strict rules about visiting hours. C. The conditions there aren't very good. D. The nurses and doctors there don't work hard. 3. The underlined word "swipe" means _____. [ ]A. wave B. sweep C. pull D. find 查看答案
题型：填空题 小王投保了意外伤害保险，某一天被车撞到成残，后被送往医院治疗，在治疗期间因感染死亡。保险公司只对意外伤残支付了保险金。保险人对被保险人死亡不负保险责任的依据是( )。A．公正原则B．近因原则C．等价有偿原则D．最大诚信原则 查看答案