题目

某工厂生产甲、乙两种产品,每生产一吨产品所消耗的电能和煤、所需工人人数以及所得产值如下表所示:品种电能(千度)煤(吨)工人人数(人)产值(万元)甲2357乙85210已知该工厂的工人人数最多是200人,根据限额,该工厂每天消耗电能不得超过160千度,消耗煤不得超过150吨,问怎样安排甲、乙两种产品的生产数量,才能使每天所得的产值最大?阅读下面短文，把四个句子填入文中空缺处（1—4），使短文内容完整正确，然后完成第5题 I think life will be very different in one hundred years' time．Some things will be better and some things will be worse． Firstly, people won't live on the surface of the earth,   1    Special machines will provide oxygen and light but the environment won't be the same．Trees and plants won't grow because there won't be any soil．  2    Food will mainly be in the form of pills．If the sea isn't too polluted, people will also eat fish．What is more, I think people's everyday life will be different． 3 No one will have to do housework either．So, people will have more free time and they will be able to enjoy the things they like--sports, for example．Finally, I believe that everyone will be able to travel to the moon, to other planets and perhaps even to other galaxies for a holiday． In conclusion,   4   Whatever happens, though, I'm sure the future will be an interesting place to live in． A．They won't have to work long hours because computers and robots will help them． B．Our cities will be under the sea, in large domes． C．I think that life in the future won't be anything like it is now． D．As a result, people won't be able to grow crops． 5．What is the best title of the passage? A．Life under the sea                                     B．The future world C．Future life in my mind                               D．An interesting place to live in