Question

 The population problem may be the greatest one of the world today. The world's population is growing faster and faster. Two thousand years ago,there were only 250 million people on the earth. Four hundred years ago, the number was over 500 million. But at the beginning of the 20th century, the world's population was about 1,700 million. In 1970, the number was 3,600 million. In 1990, the number was five billion. A UN report said that the world's population had passed six billion by the end of the 20th century. This was just ten years after it reached five billion. By October 31 ， 2011 ，with a new baby's birth, the world's population had reached 7 billion. But another billion is coming by 2025 ，and the total will reach 10 billion before the end of the century.

根据短文内容，完成下面表格。

Time	World's  Population
Two thousand  years ago	§ ■c。o
Four hundred years ago	The number was 2 .
3	The world's population was about 1 ，700 million.
By the end of the 20th  century	The world's population had 4 .
By the year of 2025	The world's population will be 5   .

1.___________  2.___________  3.________

4.___________  5._____________

Answer 1

1.250

2. over 500 million

3. At the beginning of the 20 th century

4. passed six billion

5. 8 billion