1. 阅读理解

    There are about 7 billion people on the Earth now. The world's population is a big problem because it will cause lots of problems in the future. More people will need more food and more room.

    The world population growth rate rose from about 1.5 percent per year during 1950-1951 to over 2 percent in the early 1960s.Although the growth rate thereafter started to fall due to(由于) people's getting married later as well as the development of technology, the rate is on the rise again now.

    The important thing is not how large the population of the world is, but how fast the rate increases. The world population increased from 3 billion in 1959 to 6 billion by 1999.The world population will grow from 6 billion in 1999 to 9 billion by 2050.This great growth of the population will create a big problem by the year 2100-there will be over 10 billion people in the world then.

1. （1） The population of the world is about         now and may be over          by 2100.

   A . 7 billion; 10 billion B . 7 million; 10 million C . 6 billion; 10 billion D . 6 billion; 9 million
3. （2） What does the underlined word "thereafter" refer to?

   A . Before the early 1960s. B . After the late 1960s. C . After the early 1960s. D . Before the late 1960s.
5. （3） According to the passage, the growth of the world population was the fastest in the        .

   A . early 1950s B . early 1960s C . late 1950s D . late 1960s
7. （4） From the passage we know that        .

   A . the world's population is becoming smaller B . the world's population is increasing C . the world's population growth rate won't change D . the world's population growth rate has been rising since the 1950s
9. （5） What's the best title for this passage?

   A . More food and less room B . A new problem C . We should feed many people D . The growth of the world population