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听力原文：A man is in his best shape in the decade before age 25 when his muscles are firmest, his resistance to colds and infections is highest and his body is most efficient in utilizing nutrients. For reasons that scientists do not understand, women get a five-year bonus.
Scientists do not understand why women should outlive men by five years.
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听力原文：No state epitomizes the American South better than Mississippi: First-time visitors are often struck by how friendly residents are -- the "southern hospitality" for which this part of the country is famous. They're also likely to be amazed (and far less pleased) at the year-round heat and humidity.
Mississippi is a typical American southern state.
听力原文：In September, a poll conducted by The Pioneer Press and Minnesota Public Radio found that Minnesotans, by 42 percent to 37 percent, believed that the cost of helping immigrants start their new lives outweighed their economic, social and other contributions.
About 40% of the Minnesotans believed that it was not worthwhile to help immigrants with their lives.
Which of the following statements is not tree？
According to the passage, the obesity rate of students will continue to grow unless ______.
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