问题详情

根据材料回答{TSE}题： 第二篇Prolonging Human Litre Prolonging human life has increased the size of the human population. Many people alive todaywould have died of childhood diseases if they had been bdrn 100 years ago. Because more people livelonger, there are more people around at any given time. In fact, it is a decrease in death rates, not anincrease in birthrates, that has led to the population explosion. Prolonging human life has also increased the dependency people; unless they have wealth or private or gov-ernment insurance, they must often "go on welfare (福利 )" if they have a serious illness. When older people become senile or too weak and ill to care for themselves, they create graveproblems for their families. In the past and in some traditional cultures, they would be cared for athome until they died. Today, with most members of a household working or in school, there is oftenno one at home who can care for a sick or weak person. To meet this need, a great many nursing homesand convalescent hospitals have been built. These are often profit-making organizations, althoughsome are sponsored by religious and other nonprofit groups. While a few of these institutions are good,most of them are simply "dumping grounds" for the dying in which "care" is given by poorly paid, o-verworked, and under skilled personnel. {TS} The writer believes that the population explosion results from __________
A. an increase in birthrates
B. the industrial development
C. a decrease in death rates
D. cultural advances请帮忙给出正确答案和分析，谢谢！