| 完形填空。 | |||
| 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 l, 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. | |||
| ( ) 1. A. great ( ) 2. A. faster and faster ( ) 3. A. in ( ) 4. A. hardly ( ) 5. A. twenty ( ) 6. A. USA ( ) 7. A. past ( ) 8. A. weeks ( ) 9. A. get ( ) 10. A. this |
B. greater B. fast and falt B. on B. more B. twelve B. UN B. pass B. months B. gets B. its |
C. greatest C. fastest and fastest C. at C. almost C. twentieth C. PRC C. passed C. seasons C. reached C. one |
D. greating D. faster and fast D. for D. over D. twelfth D. PLA D. passes D. years D. reach D. it |