任务型阅读: Recently some American scientists have given a useful piece of advice to people in industrialized nations . They say people should eat more of the same kind of food eaten by humans living more than 10,000 years ago . ___1___ The scientists say that the human life has changed greatly . Our bodies have not been able to deal with these changes in lifestyle and this had led to new kinds of sicknesses . ___2___ So they are called "diseases of civilization" . Many cancers and diseases of the blood system are examples of such diseases. Scientists noted that people in both the Old Stone Age and the New Stone Age enjoyed very little alcohol or tobacco, probably none . ___3___ However, a change in food is one of the main differences between life in ancient times and that of today. Stone Age people hunted wild animals for their meat, which had much less fat than domestic ones . They ate a lot of fresh wild vegetables and fruits . They did not have milk or any other dairy products, and they made very little use of grains . ___4___ We eat six times more salt, sugar and fat than our ancestors without using our bodies more . ___5___ But scientists say that we would be much healthier if we eat much the same way the ancient people d id, cutting the amount of fatty, salty and sweet food. A . Stone Age people lived a simple life. B . But today, we enjoy having a lot of these. C . In that case, they would live much healthier. D . Ancient people also got lots of physical exercise. E . These new sicknesses were not known in ancient times. F . People today probably don't want to live like our ancestors. G . Modern people used to suffer from "diseases of civilization".