填空题

Longer Lives Are Happier Lives
1 In recent years, scientists have been studying ways to change the body’s chemistry to reduce the signs and effects of aging.
2 One group of researchers in Britain has performed experiments on a kind of worm. They have managed to increase the worm’s normal life span of 20 days by up to 400%. They hope that they will be able to use this research to help humans live longer. However, this is a long way in the future. Another disadvantage is that when (or if) the new technology is successfully developed, it will probably be very expensive. The chance to live longer will only be available to a very few, very rich people.
3 Another group of scientists is studying people who have reached a very old age. They believe that this may show what has kept these people healthy and alive for so long. So, if we look at people who have lived into very old age, what do they have in common Usually they have led a physically active life. This does not mean going to a gym or running ten miles every day. Simple, enjoyable activities like walking seem to be more likely to keep you healthy. Very old people also eat a good, varied diet. Simple foods like vegetable, rice, pasta and fish are the best.
4 However, there may be one thing even more important than physical factors like diet and exercise. Research shows that personality, and the way a person thinks, play an important part in how long they will live. People who live into very old age always seem to enjoy life. They have a sense of humor and get satisfaction from simple things. They do not constantly think about the past, but are interested in the present and the future. They do not let life get boring, but have interests and hobbies which keep their minds active and they are open to new ideas. One Japanese man who lived to be 120 commented that the secret of his long life was "not worrying". To express it simply, people who are happy and positive about life are more likely to live longer.
5 So, eat well, exercise well, and enjoy life, and you will have a good chance of living to a healthy, happy old age.
A How to live happy old age
B Disadvantages of the project
C The study of old people
D Personality and other mental factors are more important
E Worms live longer than humans
F Live simple lives
Paragraph 3 ______