2. 职称英语
  3. [audioFiles]2016m6x/audio_ezfj_005_201605[/audioFiles]

[audioFiles]2016m6x/audio_ezfj_005_201605[/audioFiles]

游客2024-09-18  24
问题  
选项
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. / 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. /This means that future medical breakthroughs will result in even longer average life span.
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3764147.html
相关试题推荐
随机试题
最新回复(0)