In the United States, 30 percent of the adult population has a "weight problem". To many people, the cause is obvious: we eat too much. But scientific evidence does little to support this idea. Going back to the America of 1910, we find that people were leaner 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, moreover, have shown that fatter people do not eat more on average than thinner people. In fact, some investigations, such as a 1979 study of 3, 545 London office workers, report that, on balance, fat people eat less than slimmer people.
Studies show that slim people are more active than fat people. A study by a research group at Stanford University found the following interesting fact:
The more the man ran, the greater loss of body fat.
The more they ran, the greater their increase in food intake.
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 adult Americans have?____
 A、They are too slim.
 B、They work too hard.
 C、They are too fat.
 D、 They lost too much body fat.
参考答案：C
2、Based upon the statistics given in the article, suppose there are 500 adult Americans, about how many of them will have a "weight problem"?____
 A、 30.
 B、 50.
 C、100.
 D、150.
参考答案：D
3、Is there scientific evidence to support that eating too much is the cause of a "weight problem"?____
 A、Yes, there is plenty of evidence.
 B、Of course, there is some evidence to show this is true.
 C、There is hardly any scientific evidence to support this.
 D、We don't know because the information is not given
参考答案：C
4、In comparison with the adult American population today, the Americans of ____.
 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 exercise
 D、had more weight problems
参考答案：A
5、What have modern medical and scientific researches reported to us?____
 A、Fat people eat less food and are less active.
 B、 Fat people eat more food than slim people and are more active.
 C、 Fat people eat more food than slim people but are less active.
 D、 Thin people run less, but have greater increase in food intake.
参考答案：A
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