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    　　Brown tree snakes are causing problems to the people who live on the Island of Guam(关岛)．The snakes can grow to 10 feet in length．They hide from bright light during the day．At night, they come out looking for food．They climb trees and telephone poles．They slither(蜿蜒地滑行)through pipes into houses．They crawl along electric power lines, causing serious accidents．

    　　There are millions of these snakes．They eat birds, lizards(蜥蝎)and other small animals．Scientists say that many kinds of birds that once lived on Guam are now extinct(灭绝的)．

    　　Brown tree snakes were brought to Guam incidentally by ships coming to Guam from other places．Scientists are trying to find ways to control the number of brown tree snakes before they do more damage．

    (1)

    Brown tree snakes are ________．

    [　　]

    A．

    natives of Guam

    B．

    from other places

    C．

    all over the world

    D．

    everywhere in the US

    (2)

    The snakes don't come out looking for food ________．

    [　　]

    A．

    at night

    B．

    in the evening

    C．

    at sunrise

    D．

    during the day

    (3)

    Some kinds of birds do not exist on Guam because ________．

    [　　]

    A．

    they have been eaten by the snakes

    B．

    they are short of food there

    C．

    they have flown away to other place

    D．

    they are afraid of the snakes

    (4)

    The snakes cause a lot of trouble to ________．

    [　　]

    A．

    small animals

    B．

    birds

    C．

    the people

    D．

    all the above

    答案：1．B;2．D;3．A;4．D;
    解析：

    (1)

    从“Brown tree snakes were brought to Guam incidentally by ships coming to Guam from other places．”可推知。

    (2)

    从“They hide from bright light during the day”可推知。

    (3)

    “蛇把鸟儿吃了”。

    (4)

    　　从全文内容可知，蛇给各种动物带来危害。

    　　本篇是科普说明文，说明的主题是：科学的发展总有一天会使人类生命延长数十年。


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