A. Do we really want to know what people think of us?

　　B. What advantages does Facebook have?

　　C. What disadvantages does Facebook have?

　　D. What can we learn from the comments from others?

　　E

　　With the development of science and technology, the research of human genes is playing more and more important part in our daily life. Sometimes it is a hot topic drawing more and more attention.

　　Gene technology can cure serious diseases that doctors at present can almost do nothing with, such as cancer and heart disease. Every year, millions of people are murdered by these two killers. But if the gene technology is used, not only these two diseases can be cured completely, bringing happiness and more living days to the patients, but also the great amount of money people spend curing their diseases can be saved, therefore it benefits the economy as well. In addition, people can live longer.

　　Gene technology can help people to give birth to more healthy and clever children. Some families have hereditary diseases and their children will for sure have the family disease, which is a great trouble for these families. In the past, doctors could do nothing about them. But gene technology can solve this problem perfectly. The scientists just need to find the wrong gene and correct it, and a healthy child will be born.

　　Some people are worrying that the gene research can be used to clone human beings in large quantities. In the past few years, scientists have succeeded in cloning a sheep; therefore these people predict that human babies would be cloned. But I believe cloned babies will not come out in large amounts, for most couples in the world can have babies in a very normal way. Of course, the governments must take care to control gene technology.

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