(1) In some areas of the world, you can find many people live to celebrate their 100th birthday, and it is not unusual to see people aged 110 to 140 work in the fields with their great-great- grandchildren. (2) What accounts for this ability to survive to such an old age, and to survive so well? (3) First of all, hard physical work is a way of life for all of these long lived people. (4) They begin their long days of physical labor as children and never seem to stop. (5) Second, they get healthful rewards from the environment in which they work. (6) They all come from mountainous regions at elevations of 1,660 to 4,000 meters above sea level. (7) The air is pollution-free and has less oxygen, which makes the heart and blood vessel system stronger. (8) Another factor that may contribute to the good health is their isolation. (9) To a great extent, they are separated from the pressures and worries of industrial society. (10) Inherited factors also play some role. (11) Most of the longest-lived people had parents and grandparents who also lived to be very old. (12) Finally, although these people don’t eat exactly the same foods, their diets are similar. (13) They eat little animal meat, but a lot of fresh fruits, vegetables, nuts, grains, cheese, and milk. Fill out the blanks according to the structure of the paragraph . 1.Effect: No. 1_______ sentence. 2.Causes: A. They have done 2__________ since their childhood. B. They get 3_________ in which they work. C. 4 __________ separated them from the pressures and worries of industrial society.. D. 5_________ also play some role. E. They don’t eat exactly6_________ , their diets 7_________.