根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中的两多余选项。 Nobody has ever succeeded in their attempt to stay young and live a very long life. 1_____ But is this really true? Dr Aubrey de Grey thinks that we can stop people getting old and that in about 20 years, people will be able to live to be 1,000 years old! 2_____ In Dr Grey's opinion, getting old is a problem that can be solved. 3_____ If we can cure this disease, we can stop the aging process. We can also make people have young bodies again. Dr Grey believes that science will soon be able to stop the causes of aging so that a person's body won't get weak and won't suffer from the typical diseases of old age. Dr Grey compares the human body to a house. As the house gets older, some things must be repaired. Broken hearts must be replaced. The same thing can happen with the human body, he thinks. We can use stem cell technology to grow new, healthy tissue to replace the old, damaged one. We can also try to remove disease-causing molecules in our bodies. 4_____. 5_____ However, they admit that Dr Grey's ideas have not yet been proved wrong. Dr Grey is convinced that his opinions are realistic and that his research is very important. If aging is a disease, he says, we must try to cure it. A. At the same time, people's bodies will stay young and healthy. B. Scientists succeed in solving the problem of aging long ago. C. A lot of scientists think his ideas not realistic. D. When our bodies change as we get older, this is like a disease. E. New deadly diseases may also be cured, if we can stop the aging process. F. It seems that everybody must get old and die. G. In this way, a person could easily live to be 1,000 years old.