Cloze test

There are many problems in the world, but the population problem may be the1 one of the world today. The world's population is growing 2 .Two thousand years ago, there were only 250 million people on the 3 Four hundred years ago, the number was 4 500 million. But at the beginning of the 5 century, the world's population was about 1,700 million. In 1970, this number was 3,600 million. In 1990, the number was five billion. A UN 6 said that the world's population had 7 six billion by the end of the 21th century. This is just ten 8 after it 9 five billion. People say that by the year 2010, 10 may be seven billion.

　　The population problem may be the ___6___ one of the world today. People say that by the year 2010, the world's population may pass seven billion. This means we must ___7___ more food, and have smaller families with fewer ___8___ healthier children. If we don't do these, the result（结果）will be very ___9___. There will be standing room only on the earth. There won't be enough ___10___ for anybody else.

　　During just one minute, 174 babies are born in world. That means people 1 find food for over 250, 000 mouths 2 in one day. The population problem 3 the greatest one of the world today.

　　The world's population is growing faster and faster. In 1990, the population 4 over five billion. An UN re port 5 that the world population will pass six billion 6 the end of the twentieth century. People say that by the year 2010, it will be seven billion. That means 7 in about 600 years, there will be standing 8 only on the earth. There 9 enough space for anybody 10 .

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