填空题 The average life expectancy in 21 st century will be 1.

  • 1、
【正确答案】 1、more than/above 73 years    
【答案解析】参见第二段倒数第二句“Average life expectancy is expected to hit 73 years by 2025—and that's only an average.”2025年平均年龄就能达到75岁,以后当然更高。