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  3. Life Span [audioFiles]2016m3x/audio_ezfj_173_20162[/audioFiles] Life Span

Life Span [audioFiles]2016m3x/audio_ezfj_173_20162[/audioFiles] Life Span

游客2024-09-20  59
问题 Life Span
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答案     Life Span
    About a century ago, the average life span for Americans was about 50 years. /Today, the typical American lives for around seventy-eight years. /According to a German aging study, /the maximum life span in industrialized countries has increased by two years every decade /since the mid-19th century. /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 /such as some fatal ones that killed many children. /These advances helped increase the average life span. /Medical discoveries after World War II tended to benefit older people. /Treatments for heart disease, for example, /have allowed the elderly to live longer on average. /This means that future medical breakthroughs will result in even longer average life span.
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