12．In the United States，30 percent of the people have a"weight problem"．To many people the cause is obvious（明顯的）：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（苗條的）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．a(chǎn)te more food and had more physical activities
B．a(chǎn)te less food but had more physical activities
C．a(chǎn)te less food and had less physical activities
D．had more problems．

分析 本文講述了當(dāng)代的美國(guó)人許多人出現(xiàn)了肥胖問題，和過去的人相比，專家發(fā)現(xiàn)苗條的人更愛運(yùn)動(dòng)．

解答 32．C．細(xì)節(jié)理解題．由第一段In the United States，30 percent of the people have a"weight problem"．可知許多美國(guó)人如今都有肥胖問題，故選C．
33．D．理解推斷題．由第一段In the United States，30 percent of the people have a"weight problem"．可知百分之30的人會(huì)有肥胖問題，因此九百個(gè)人中會(huì)有270人，故選D．
34．C．細(xì)節(jié)理解題．由第一段But scientific evidence does little to support this idea可知很少有證據(jù)能證明這點(diǎn)，故選C．
35．A．理解推斷題．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年的美國(guó)人吃的更多但是做更難的工作，走的更多，故選A．

點(diǎn)評(píng) 本篇文章難點(diǎn)在推理判斷題上．推理判斷題要以表面文字為前提，以具體事實(shí)為依據(jù)進(jìn)行推理，做出判斷．這種推理方式比較直接，考生只要弄清事實(shí)，即可結(jié)合上下文推斷出合理的結(jié)論．

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