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12.In the United States,30 percent of the people have a"weight problem".To many people the cause is obvious(明显的):They eat too much.But scientific evidence does little to support this idea.Going back to 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 television.
Several modern studies,moreover,have shown that fatter people don't eat more on average than thinner people.A 1979 study of 3,545 London office workers shows that fat people eat less than slim(苗条的)people.
Studies also show that slim people are more active than fat people.A study by a research group at Stanford University found the following interesting facts:The more the man ran,the greater loss of the body fat.The more they ran,the greater increase in food intake.
Thus,those who ran the most ate the most,yet lost the greatest amount of body fat.

32.Nowadays many Americans have the problem thatC.
A.they are too slim
B.they work too hard
C.they are too fat
D.they lose too much body fat
33.According to the passage,how many people in 900 Americans have a"weight problem"?D
A.150.B.300.C.600.D.270.
34.Is there any scientific evidence to support the idea that eating too much is the cause of a"weight problem"?C
A.Yes,there is plenty of evidence.
B.Of course,there is some evidence to support this.
C.There is hardly any scientific evidence to support this.
D.We are not sure.
35.The Americans in 1910A.
A.ate more food and had more physical activities
B.ate less food but had more physical activities
C.ate less food and had less physical activities
D.had more problems.

分析 本文讲述了当代的美国人许多人出现了肥胖问题,和过去的人相比,专家发现苗条的人更爱运动.

解答 32.C.细节理解题.由第一段In the United States,30 percent of the people have a"weight problem".可知许多美国人如今都有肥胖问题,故选C.
33.D.理解推断题.由第一段In the United States,30 percent of the people have a"weight problem".可知百分之30的人会有肥胖问题,因此九百个人中会有270人,故选D.
34.C.细节理解题.由第一段But scientific evidence does little to support this idea可知很少有证据能证明这点,故选C.
35.A.理解推断题.由第一段Going back to 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,可知1910年的美国人吃的更多但是做更难的工作,走的更多,故选A.

点评 本篇文章难点在推理判断题上.推理判断题要以表面文字为前提,以具体事实为依据进行推理,做出判断.这种推理方式比较直接,考生只要弄清事实,即可结合上下文推断出合理的结论.

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