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　　【听力原文-Passage 2】

　　原文：

　　(12) Public interest was aroused by the latest discovery of a changed gene in obese mice. The news was made known by Rockefeller university geneticist Jeffrey Friedman. The researchers believe this gene influences development of a hormone that tells organism how fat or full it is. (13) Those with the changed gene may not sense when they have eaten enough or if they have sufficient fatty tissue, and thus can’t tell when to stop eating.

　　The researchers also reported finding a gene nearly identical to the mouse obesity gene in humans. The operation of this gene in humans has not yet been demonstrated, however. (14) Still, professionals like university of Vermont psychologist Eyster Ross Bloom reacted enthusiastically. This research indicates that people really are born with a tendency to have a certain weight, just as they are to have a particular skin color or height. Actually, behavioral geneticists believe that less than half of the total weight variation is programmed in the genes, while height is almost entirely genetically determined. Whatever role genes play Americans are getting fatter.

　　A survey by the center for disease control found that obesity has increased greatly over the last 10 years. (15)Such rapid change underlines the role of environmental factors like the abundance of rich foods in Americans overeating. The center for disease control has also found that teens are far less physically active than they were, even a decade ago. Excepting that weight is predetermined, can relieve guilt for overweight people. But people’s belief that they cannot control their weight can itself contribute to obesity.

　　Questions 12 to 15 are based on the passage you have just heard.

　　Question 12. What does the speaker say has aroused public interest?

　　Question 13. What do we learn about the changed gene?

　　Question 14. What does university of Vermont psychologist Eyster Ross Bloom say?

　　Question 15. What accounts for Americans obesity according to a survey by the center for disease control?

　　【题目解析】

　　Q12. Passage部分的听力出题顺序基本上跟原文顺序一致。当第一句话出现关键词“public interest was aroused the latest discovery of a changed gene in obese mice”所以by…部分即为答案。该题比较容易作答，关键词和提示词都很明显。

　　Q13. 该题难度比较大，因为问题当中的关键词“the changed gene”是在原文中出现好多次，所以考生可以按照出题顺序判断对应原文的大概位置并且提到“the changed gene”, 详见(13)的原文语句。

　　Q14. 这道题关键词很明确，很好定位，根据“university of Vermont psychologist Eyster Ross Bloom”的明确信号接着往下听“This research indicates that people really are…”

　　Q15 该题的关键词为“Americans obesity”“a survey by the center for disease control”很明确的出现在“A survey by the center for disease control found that…”考生只需要认真听接下来的部分“Such rapid change underlines the role of environmental factors…”就不难得出正确答案

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