2013年浙江省高考英语二轮专项复习之阅读理解49
阅读下列短文，从每题所给的A.B.C和D项中，选出最佳选项，并在答题卡上将该项涂黑。
A
Prolonging human life has increased the size of the human population. Many people alive today would have died of childhood diseases if they had been born 100 years ago. Because more people live longer, there are more people around at any given time. In fact, it is a decrease in death rates, not an increase in birthrates, that has led to the population explosion.
Prolonging human life has also increased the dependency load. In all societies, people who are disabled or
