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19. Perhaps no issues are more controversial than euthanasia and abortion , both of which involve taking the life of a human being . 也许没有问题比安乐死和人工流产更有争议性，它们都涉及结束一个人的生命。 20. Never before in history has the issue of overpopulation been more evident than now . 历史上，人口过剩的问题从来没有比现在更加突出。 21. Perhaps it is time to reexamine the idea that college degrees are a guarantee of intelligence . 也许现在是应该重新考虑大学为是智力的保证这种想法的时候了。 22. A growing number of people are beginning to realize that wealth is not the sole prerequisite for happiness . 越来越多的人开始意识到财富不是幸福的惟一先决条件。 23. In spite of the extraordinary progress made in science and technology , problems remain in terms of guaranteeing that achievements benefit the greatest number of people . 尽管科学技术取得了非凡的进步，但是在保证进步成果使尽可能多的人受益这方面还存在一些问题。 24. A famous thinker once wrote thatthe greatest threat to mankind is mankind itself !If this is indeed the case , then the current situation should make us ponder our futuer existence . | 
