2. 外语
  3. Since 1955, life expectancy rates in the U. S. have The expression "adding vital life to years" in the last paragraph means

Since 1955, life expectancy rates in the U. S. have The expression "adding vital life to years" in the last paragraph means

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问题 Since 1955, life expectancy rates in the U. S. have
The expression "adding vital life to years" in the last paragraph means
选项 A、living longer.
B、living well.
C、living longer and well.
D、living at any cost.
答案B
解析 这个短语指的是生活质量的提高。
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