In the United States, 30%of the grown-up population has a “weight problem”. To many people, the cause is clear: we eat too much. But scientific experiments do little to support this idea. Going back to the America of 1910, we find that people were thinner than today, yet they ate more food. In those days people worked harder physically, walked more, used machines much less, and didn’t watch TV.
Several modern studies, besides, have shown that fatter people do not eat more on average than thinner people. In fact, some research work, such as the 1979 study of 3,545 London office workers, reports that fat people eat less than thinner people on average. Studies show that thin people are more active than fat people. A study by the research group at Standford University School of Medicine found the following fact: the more the man ran, the greater body fat he lost. The more he ran, the greater was his need for food. Thus, those who ran the most ate the most, yet lost the greatest amount of body fat.
1. What kind of physical problem do many grown-up Americans have?
A. They are too thin.               B. They work too hard.
C. They are too fat.                D. They lose too much body fat.
2. Based on the information given this article, suppose there are 500 grown-up Americans, about how many of them have a weight problem?
A. 30     B. 50       C. 100       D. 150
3. Are there scientific facts to support that eating too much is the cause of the “weight problem”?
A. Yes, there are plenty of them.
B. Of course, there are facts to show this is true.
C. There are hardly any scientific facts to support this.
D. We don’t know because the information is not given.
4. Compared with the grown-up Americans today, the Americans of 1910______.
A. ate more food and had more physical activities
B. ate less food but had more activities
C. ate less food and had less physical activities
D. had more weight problems

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