Like a needle climbing up a bathroom scale, the number keeps rising. In 1991, 15% of Americans were obese (肥胖的); by 1999, that p

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问题 Like a needle climbing up a bathroom scale, the number keeps rising. In 1991, 15% of Americans were obese (肥胖的); by 1999, that proportion had grown to 27%. Youngsters, who should have age and activity on their side, are growing larger as well: 19% of Americans under 17 are obese. Waistbands have been popping in other western countries too, as physical activity has declined and diets have expanded. By and large, people in the rich world seem to have lost the fight against flab (松弛).
Meanwhile, poorer nations have enjoyed some success in their battles against malnutrition and famine. But, according to research presented at the annual meeting of the American Association for the Advancement of Science, it is more a case of being out of the frying pan and into the fire. The most striking example actually in the poor world comes from the Pacific islands, home of the world’s most obese communities. In 1966, 14% of the men on this island were obese while 100% of men under the age of 30 in 1996 were obese.
This increase in weight has been uneven as well as fast. As a result, undernourished and over-nourished people frequently live cheek by jowl (面颊). The mix can even occur within a single household. A study of families in Indonesia found that nearly 10% contained both the hungry and the fat. This is a mysterious phenomenon, but might have something to do with people of different ages being given different amounts of food to eat.
The prospect of heading off these problems is bleak. In many affected countries there are cultural factors to contend with, such as an emphasis on eating large meals together, or on food as a form of hospitality. Moreover, there is a good measure of disbelief on the part of policymakers that such a problem could exist in their countries. Add to that reluctance on the part of governments to spend resources on promoting diet and exercise while starvation is still a real threat, and the result is a recipe for inaction. Unless something is done soon, it might not be possible to turn the clock back.
As physical exercise declines and diet expands, _____.

选项 A、other western countries has been defeated by fat
B、obesity has become an epidemic (流行病) of the rich world
C、waistbands begin to be popular in other western countries
D、western countries can no longer fight against obesity

答案B

解析推理判断题。本题需要正确理解借代修饰手法。Waistbands have been popping形象刻画出其他西方社会急剧肥胖化的过程，故答案为B。本题很明显是考查因果关系的，第1段倒数第2句明确指出这个因果关系，只要根据该句做出选择就可以了。如果看得过远，反而有可能误选A或D。

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