题目内容
建设单位通过招标投标的方式将某公路工程施工任务发包给华山路桥公司，并与该施工单位签订了施工合同。施工之前，施工单位与某水泥厂签订了水泥材料的供应合同，合同中约定由水泥厂负责将施工所需的水泥材料运抵施工现场，但未明确水泥材料的供应时间。施工开始后，工程施工急需水泥材料，施工单位要求水泥厂立即将施工所需的水泥材料运抵施工现场，但遭到该水泥厂的拒绝。两天后水泥厂才将施工所需的水泥材料运到施工现场。根据上述背景材料，解答下列问题： 上述背景材料中，水泥厂的做法是否正确说明理由。
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根据我国法律规定，无效合同的确认权属于______。
Cloning (克隆): Future Perfect 1. A clone is an exact copy of a plant or animal produced from any one cell. Since Scottish scientists reported that they had managed to clone a sheep named Dolly in 1997 research into cloning has grown rapidly. In May 1998, scientists in Massachusetts managed to create WTO identical calves (牛犊) using cloning technology. A mouse has also been cloned successfully, but the debate over cloning humans really started when Chicago physicist Richard Seed made a surprising announcement: "We will have managed to clone a human being within the next two years," he told the world. 2. Seed’s announcement provoked a lot of media attention, most of it negative. In Europe, nineteen nations have already signed an agreement banning human cloning and in the U.S. the President announced: "We will be introducing a law to ban any human cloning and many states in the U.S. will have passed anti--cloning laws by the end of the year." 3. Many researchers are not so negative about cloning. They are worried that laws banning human cloning will threaten important research. In March, The New England Journal of Medicine called any plan to ban research on cloning humans seriously mistaken. Many researchers also believe that in spite of attempts to ban it, human cloning will have become routine by 2010 because it is impossible to stop the progress of science. 4. Is there reason to fear that cloning will lead to a nightmare world The public has been bombarded (轰炸) with newspaper articles, television shows and films, as well as cartoons. Such information is often misleading, and makes people wonder what on earth the scientists will be doing next. 5. Within the next five to ten years scientists will probably have found a way of cloning humans. It could be that pretty soon we will be able to choose the person that we want our child to look like. But how would it feel to be a clone among hundreds, the anti-cloners ask. Pretty cool, answer the pro-cloners (赞成克隆的人). A. Strong Reactions B. Anxiety about the Future of Cloning C. The Right to Choose D. What is Cloning E. Arguments in Favor of Cloning F. A Common Sight Within ten years scientists will probably have ______.
What should be done if one wants to gain or lose weight The process of gaining or losing weight can be explained by comparing your body to your car. Both run 1 fuel, food for your body and gasoline for your car. Both 2 that fuel, first into heat, then energy, some of 3 is used to do work, and some emitted as waste. And 4 your car uses more energy when the engine is racing than when it is idling, 5 does your body use more energy when you are working hard than 6 you are resting. For the purpose of this comparison, 7 , there is one significant difference between them. Your car cannot store fuel by turning it into 8 else; all gasoline not 9 remains as gasoline. But your body stores 10 energy as fat. When the gas tank is 11 empty, the car won’t run; but your body can burn fat to provide more energy. Therefore, if you want to gain weight, you must do 12 of two things: eat more calories (units of heat, therefore energy), or use less through 13 . If you want to lose weight, you do the 14 , decrease your intake of calories or increase the amount of energy you spend. There is 15 way. Gaining or losing weight is always a relation between intake and output of potential energy.
按照《合同法》规定，合同的订立必须经过______两个阶段。
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