It has been estimated that a thousand years ago there were less than 400 million people on earth. Today, however, the world＇s population has amounted to 5,000 million. What is worse, it keeps growing at a surprising speed. If this trend continues, the world＇s population will shoot up to 7,000 million by the year 2000. This is what we call population explosion. 　　The rapid developm...[繼續(xù)閱讀]

    As is known to us,China has the biggest population in the world,which is more than 1,300,000,000.Such a large population causes some problems in cities,that‘s the unemployment.Too many people gather in cities and the jobs are not enough.Some graduates can‘t find a job though they have left school for years.In addition,traffic jam is another problem resulting from the big population.The...[繼續(xù)閱讀]

    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 t...[繼續(xù)閱讀]