标题: 中考英语完形填空训练（001） [打印本页] 作者: 网站工作室 时间: 2008-1-27 14:54 标题: 中考英语完形填空训练（001） The population problem may be the 1 one of 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's population was about 1,700 million．In 1970, this number was 3,600 million． In 1990, the number was five billion． A 6 report says 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 2010, 10 may be seven billion．