【语篇解读】 本文分析了人口增长的真正原因及美国的老年人问题。
1．The author believes that the population explosion results from______.
A．an increase in birthrates
B．the industrial development
C．a decrease in death rates
D．human beings' cultural advances
【解析】 细节理解题。根据文章第一段最后一句“...it is a decrease in death rates，not an increase in birthrates，that has led to the population explosion.”可知答案为C。
