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  3. Lifespan About a century ago, the average lifespan of Americans was about 50 years.

Lifespan About a century ago, the average lifespan of Americans was about 50 years.

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问题                                 Lifespan
    About a century ago, the average lifespan of Americans was about 50 years.
Lifespan
    About a century ago, the average lifespan of Americans was about 50 years. Today, the typical American lives for around 78 years. / What accounts for such increased longevity? / Between 1900 and 1950, inventions such as refrigeration and sewage treatment / meant that young people were able to survive longer. / Moreover, medical breakthroughs helped contain diseases that killed many children. / This means that future medical breakthroughs will result in even longer average lifespan.
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答案 Lifespan About a century ago, the average lifespan of Americans was about 50 years. Today, the typical American lives for around 78 years. / What accounts for such increased longevity? / Between 1900 and 1950, inventions such as refrigeration and sewage treatment / meant that young people were able to survive longer. / Moreover, medical breakthroughs helped contain diseases that killed many children. / This means that future medical breakthroughs will result in even longer average lifespan.
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