当k______时，关于x的方程x-2k=-4的解大于5．

B）翻译（共5小题，计10分）阅读下面的短文，将划线句子翻译成中文。51.Today life is much better than before. Vision phone(可视电话) is used in some provinces. Maybe it will be used in every family. People can have an examination about their health without a doctor or a nurse in the room. 52.Now some people do some shopping at home.53.And how about our education？ There have been more educational(教育的) programs on the radio， on TV or on the Internet. Some children live very far away from their schools， more and more of them don’t need to go to school every day now. They can study at home. 54.Teachers teach them on the Internet.In the future， each family will have a robot. 55.Robots will help people with their housework. In some years people can have a trip on the moon and some people can live under the sea in hot summer.51.Today life is much better than before

——The police have caught themurderer.——Yes, and he admitted ____hisboss on a rainy night seven years ago.
A. to killB tohave killedC having killingD have been killed

学校组织春游，需租用汽车若干辆，如果每辆汽车坐40人，则有20人没有上车；如果每辆汽车坐45人，则可空出一辆汽车，并且有一辆车还可坐10人。问有多少辆汽车？共有多少名学生？

写出一个含m的代数式，要求：无论m取何值，代数式的值都小于0．

在一个单项式中，所有字母（），叫做这个单项式的（）。