本文分析了人口增长的真正原因及美国的老年人问题。
1. C。细节题。根据文章第 1 段最后一句 …it is a decrease in death rates, not an increase in birthrates, that has led to the population explosion 可推知此题答案为 C。
2. B。推断题。根据文章第 2 段第 4 句 …infants might be allowed to die because they could not survive if their parents starved, where as if the parents survived they could have another child可推知此题答案为 B。
3. A。细节题。根据文章第 2 段倒数第 2 句In the United States many retired people live on social security checks which are so little that they must live in near poverty 可推知此题答案为 A。
