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,      1 0      may be seven billion．

　　(    )1．A．great     B．greater   C．greatest     D．greating

　　(    )2．A．faster and faster         B．fast and fast

　　C．fastest and fastest        D．faster and fast

　　(    )3.A．in         B．on       C．at          D．for

　　(    )4．A．nearly    B．more     C．almost      D．over

　　(    )5．A．twenty    B．twelve    C．twentieth   D．twelfth

　　(    )6．A．USA     B．UN       C．PRC       D．PLA

　　(    )7．A．past      B．pass      C．passed      D．passes

　　(    )8．A．weeks    B．months    C．seasons     D．years

　　(    )9．A．get       B．gets      C．reached     D．reach

　　(    )10．A．this      B．its       C．one        D．it