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。选项中有两项为多余选项。
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 "disease of
civilization". Many cancers and disease of 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 than our ancestors (祖先). We eat more sugar. We
eat twice as much fat but only one third as much protein and much less vitamin C.
5_____ But scientists say that we would be much healthier if we eat much the same way as our ancestors
did, cutting the amount of fatty, salty and sweet food.
A. These new sicknesses were not known in ancient times.
B. People today probably do not want to live the way people thousands of years ago did.
C. Ancient people also lived in large groups.
D. But today, we eat a lot of these.
E. Ancient people also got a great deal of physical exercise.
F. In that case, they would live much healthier.
G. People today probably live the same life as people thousands of years ago did.