For the past 50 years, due to changes in lifestyle and recreational activities, the population of the United States has become increasingly kyphotic, displaying poor posture and spine curvature, and it will probably have what is estimated as100 million people with back problems next year, more than any other nation in the world will.
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Ait will probably have what is estimated as
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Bthey are likely to have
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Cthe country will probably have
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Dthere will probably be
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Ethere will be an estimated
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正确答案: C