The reason for a rapid growth of population lies in the fact that

A．people are permitted to have more children

B．people can live better than before

C．newborn babies die less than before

D．we have found the secret of longevity

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参考答案

答案解析

定位：根据题干信息词a rapid growth of population定位到第三段最后一句。
解析：题干问人口快速增长的原因。根据第三段最后一句可知，“……近年来人口剧增的原因不是由于人们突然热衰于生更多的孩子，而是因为长期以来导致高死亡率的条件得到了改善”。由此可知，人口快速增长源于人类生活条件的改善，故正确答案为8。

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