范文4
Population Control
Progress in science and the improvement of living conditions have led to the rapid growth of the world population. Modern medicine, for example, has made it possible for babies to grow up healthily and for people to live longer. With improved living conditions, particularly in the countryside, people tend to have larger families. As a result, the world population has increased so rapidly that it has now exceeded 6 billion.
But the overgrowth of population presents a threat to the existence of human society. A large population demands a great deal of food supply and shelter space. However, limited productivity and scarce world resources can hardly meet the needs of the ever-increasing population. Thus, in the long run, the overgrowth of the world population will only harm mankind.
To guarantee the steady development of human society, mankind must realize the consequences resulting from fast population growth and carry out a family planning programme. Only by adopting effective measures, can human society develop steadily and have a bright future.
<评析> 本文把各个段落巧妙连接的方法是利用转折关系：文章第一段说：科学的发展和生活条件的改善使世界人口出现了迅速增长。第二段却一转，说道：人口的过分增长威胁了人类社会生存，第二段段首句引出的问题，是第一段讨论内容的又一方面。最后一段提出解决办法，即人们必须采取行之有效的人口政策限制人口的增长。
转折过渡句往往用在这样类型的文章，即所有事物都有正有负，正、反两方面均提出后，再寻找解决办法。
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