纯原创新视野大学英语4Unit 8 Is biotechnology our friend or enemy？.pptx

Unit 8 Is biotechnology our friend or enemy？;;;Q1.1;Some people do not like GM crops and food for various reasons. If transgenic crops are planted in a field, they may overrun it and eliminate other crops, for they are especially powerful. Some genetically altered plants and animals can be abnormally large, and people cannot be sure that they will not be harmed from eating such foods. Moreover, we do not know whether abnormal genes will be passed on to the next generation. No wonder some people demand that GM food be labeled. But on the whole people are increasingly accepting GM food. Since we have not solved the problem of hunger in the world, GM food should be introduced to us. As the world population continues to expand, perhaps we have to depend more on GM crops in the future. So far, people eating GM food look just as healthy as those who do not, but scientists should monitor any possible dangers to health. ;Many people are against human cloning, and some countries have passed laws to ban it. It is often said that mankind should not interfere with nature, for we do not know what may happen if nature strikes back. Also, human cloning may bring many religious, social and ethical problems, and the present religious and social systems may collapse. Anyway, humanity has not yet mastered the technology to create a human. However, history shows that mankind is always curious to explore what is unknown and eager to accomplish what seems to be impossible. With further technological development, scientists will be able to create human clones, who are likely to be stronger, cleverer and better-looking than people today. Even if there are social and moral problems with human cloning, perhaps politicians and sociologists can figure out ways to resolve them. At least, the cloning of human cells and organs has great potential in the medical field. ;Scientists have completed a genetic map of rice and made great headway into mapping human genes. With a complete map of rice gene