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3.
The average life expectancy for the United States population as a whole is 73.9 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?
(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.（B）
(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.
OG解释C是说in the absence of other relevant information， have no bearing on the conclusion。是指Twenty-five percent 不够充分呢，还是指Louisianians who move to Hawaii 跟结论是说出生在H的婴儿的集合无关呢？我知道这个问题很菜，但还是急切的盼望大虾的回复。谢--- | 
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发表于 2005-9-18 22:37:00
