47.What can we know from the third paragraph?
A.The measurement of height and weight has nothing to do with the cause of obesity.
B.Results in the past years can be inaccurate as they haven’t adopted actual measurements.
C.It is the first time in thirty years to conduct research into the cause of obesity.
D.Researchers didn’t know the relations between obesity and height in the past years.
答案:B
解析:推理判断题。第三段末句提及自我报告的数据(self-report data)时,用了非限制性定语从句which can be unreliable,由此判断,过去的研究数据不是很准确。故选B项。
48.How many rural Americans have the problems of obesity?
A.304,347,826. B.23,380,000.
C.27,720,000. D.16,553,040.
答案:C
解析:数字计算题。美国乡下居民为70,000,000,39.6%的人有肥胖症,因此,乡下肥胖人数为27,720,000。故选C项。
49.What contributes to the rural residents’ obesity problem?
A.Rich diet. B.More physical labor.
C.Good medical service. D.Separation from the city.
答案:A
解析:细节理解题。文章中讨论了导致乡下居民肥胖的几个因素,包括饮食、机械化和较差的医疗服务。故选A项。
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