Life Span About a century ago, the average life span for Americans was about 50 years. /Today, the typical American lives fo

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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. /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.

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专业英语四级

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Life Span About a century ago, the average life span for Americans was about 50 years. /Today, the typical American lives fo

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A、Mentaldiseases.B、Sleepproblems.C、Highbloodpressure.D、Heartproblems.A本题考查细节。由句(2—1)和(2—2)可知，不活动的人可能会有睡眠问题或者容易得感冒，并且缺乏锻

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