阅读短文,从方框中选择适当的词并用其正确形式填空,使短文通顺、意思完整。
twenty,reach,great,say,over,get,on, faster and faster,year,it, pass,about |
The population problem may be one of the 1 problems in the world today. The world’s population is growing 2 Two thousand years ago,there were only 250 million people 3 the earth. Four hundred years ago,the number was 4 500 million. But at the beginning of the 5 century,the world population was about 1,700 million. In 1970,this number was 3, 600 million. In 1990,the number was five billion. A : UN report 6 that the world population will 7 six . billion by the end of the 20th century. This is just ten . 8 after it 9 five billion. People say that by the . year 2015,10 may be eight billion.
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