【正确答案】 A

【答案解析】[试题分析] 本题考查学生查找与主旨有关的具体事实的能力。
[详细解答] 文章第三段第二、三两句话就很好地解答了这道题。“There has never been a time in history when human beings in general have been statistically as healthy as the people now living in the industrial societies of the Western world．Our average life expectancy has stretched from 45 years a century ago to today’s figure of around 75．”根据以上内容，我们可得知我们现代人比以往任何时代的人们都要健康，平均寿命从一个世纪以前的45岁延长到75岁。因此，本题选A。