About how many adult Americans have the "weight problem"? ______ percent.

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问题 About how many adult Americans have the "weight problem"? ______ percent.
  
[16]In the U.S.A, 30% of the adult population has a weight problem. To many people, the cause is obvious: [17]they eat too much. But scientific evidence doesn’t 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, [18]people worked harder physically, walked more, used machines much less and didn’t watch television. Several modern studies have shown that fatter people don’t eat more than thinner people. In fact some investigations report that fat people eat less than thinner people. Recently a study of a research group found the following interesting fact: [19]thinner people are more active than fatter people. Therefore, [20]those who exercise regularly can eat more and still lose a large amount of body fat.

选项

答案harder / hard

解析 题目询问为什么1910年的美国人比现在的美国人瘦。抓住关键词thinner去听原文,可以听到“追溯到1910年时的美国,我们会发现当时的人要比现在更瘦,可他们吃得更多。那时的人们做更多的体力活(people worked harder physically)……”可以得出答案为harder或hard。
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