问题描述：
第四题选C,请问为什么?
At the ___(3) of this century,as medcal knoeledge advanced,the span ___(4) to 45.In 1950,70-year-olds were ___(5) old.Today,a healyhy 70-year-old is looking forward to many more ___(6).
3.A)edge B)age C)time D)turn
4.A)enlarged B)enlarges C)increased D)incresaes
5.A)really B)scarcely C)barely D)horrible
6.A)active B)passive C)awaitin D)
At the ___(3) of this century,as medcal knoeledge advanced,the span ___(4) to 45.In 1950,70-year-olds were ___(5) old.Today,a healyhy 70-year-old is looking forward to many more ___(6).
3.A)edge B)age C)time D)turn
4.A)enlarged B)enlarges C)increased D)incresaes
5.A)really B)scarcely C)barely D)horrible
6.A)active B)passive C)awaitin D)
问题解答：
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