65. Some people assert that nothing is impossible . Such people should get a grip on reality and understand it's impossible to create another Universe . In more down-to-earth terms , it's impossible to know with any certainty whether you will live or die tomorrow .

　　一些人断言没有什么事是不可能的。这些人应该把握现实，知道再造一个宇宙是不可能的。更现实的说法是不可能明确知道明天你会活着还是会死。

　　66. Two major factors contributed to devastating summer flooding along the Yangtze River and its tributaries . First , erosion resulting from excessive deforestation in the upper reaches of the river and , second ,heavy silting which raised the riverbed in the main channel .

　　两个主要因素导致了夏季长江及其支流的特大洪水。第一，过度砍伐引起的河流上游的侵蚀，第二，严重的泥沙淤积抬高了主干道的河床。

　　67. Greed and a total lack of social consciousness have been cited as major reasons for the dramatic rise corruption . 人们认为贪婪和社会意识的彻底缺乏是造成腐败急剧增加的主要原因。

　　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。