68. There are several reasons for the marked increase in China's crime rate—the dramatic influx of itinerant workers in urban areas ; declining social values ; and widening disparities between the haves and have-nots .

　　中国的犯罪率显著升高有很多原因——城区大量流动工人的涌入;社会价值的贬低以及贫富之间日益扩大的差距。

　　69. Why are an increasing number of elderly Chinese parents living apart from their children ? One reason is the increasing upward mobility of the younger generation . Another is expanding social opportunities for the elderly . Perhaps the main reason , however , centers on dramatic changes in traditional concepts .

　　为什么越来越多的中国老人不和他们的孩子住在一起?原因之一是年轻一代的上进心增强了。另一个原因是社会上老人的机会增加了。然而，主要的原因可能是传统观念发生了巨大变化。

　　70. What has sparked the increasing interest in exercise ? For one thing , people have gained a greater awareness of the need for physical fitness . For another , the constantly improving standard of living enables Chinese people to patronize the increasing number of recreational venues . The main thing perhaps centers on the healthcare and psychological benefits exercise provides .

　　什么引发了人们对锻炼越来越浓的兴趣?一方面，人们更加清楚地意识到保持身体健康的必要性。另一方面，不断提高的生活水平使中国人能够支付增加的娱乐支出。最主要的可能在于锻炼带来的保健和心理上的好处。

　　71. Identifying the reasons for an emerging phenomenon which involves several complicated factors is far from an easy task . For example , some scientists attribute environmental deterioration to a series of natural factors , while others place the blame solely on inappropriate human behavior .