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1 . The average life expectancy for the United States population as a whole is 9 years, but children born in Hawaii will live an
1 . The average life expectancy for the United States population as a whole is 9 years, but children born in Hawaii will live an
admin
2014-10-21
53
问题
1 . The average life expectancy for the United States population as a whole is 9 years, but children born in Hawaii will live an average of 77 years, and those born in Louisiana, 71.7 years. If a newlywed couple from Louisiana were to begin their family in Hawaii, therefore, their children would be expected to live longer than would be the case if the family remained in Louisiana. Which of the following statements, if true, would most significantly strengthen the conclusion drawn in the passage?
选项
A、As population density increases in Hawaii, life expectancy figures for that state are likely to be revised downward.
B、Environmental factors tending to favor longevity are abundant in Hawaii and less numerous in Louisiana.
C、Twenty-five percent of all Louisianians who move to Hawaii live longer than 77 years.
D、Over the last decade, average life expectancy has risen at a higher rate for Louisianians than for Hawaiians.
E、Studies show that the average life expectancy for Hawaiians who move permanently to Louisiana is roughly equal to that of Hawaiians who remain in Hawaii.
答案
B
解析
支持重点支持结论,即支持“孩子的寿命变长”。若(B)是对的,它提到的具有更丰富的促进长寿的环境因素可能至少部分地解释在夏威夷寿命预期更高,在夏威夷出生的孩子从出生就从这些因素中获益。因而,那些在夏威夷生下小孩的路易斯安那人提高了他们的孩子活得更长的可能性。因此,(B)是正确答案;如果夏威夷的寿命预期将要下降,如选项(A)所言,将会削弱而不是加强该结论;选项(C)和(E),在缺乏其他相关信息的情况下,同该结论没有关系;因而,(C)和(E)不合适。选项(D)是无关选项,因为它提到的关于增长速度的信息可能已经融入了短文中引用的统计数据中。
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