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    根据文章内容填空，每空一词。

    Humans are responsible for causing changes in the environment that hurt animals and species(物种)。We take up more space on Earth for our homes and cities. We pollute habitats(栖息地). 48__________ illegally hunt and kill animals. All of these activities take resources and habitats away 49_______plants and animals.

    Hunan activity often changes or destroys the habitats that plants and animals need to survive.  50________ human populations are growing so fast animals and plants are disappearing many times faster51______ they have in the past 65 million years.

    Animals and plants have always had a 52______ time surviving. Animals became extinct in the past for a wide variety of reasons. In some cases, competition for resources among animals led to extinction and in 53_______ cases, environmental changes caused extinction.

    Fortunately, we humans are beginning to realize our mistakes, 54_____we could destroy everything on Earth. We must not only use our knowledge and abilities to manage the Earth,55________to make the Earth a safe and healthy place where all animals and plants—including humans ourselves –can live.

    48.we   49.from   50.because / as / since   51.than  

    52.hard / difficult  53.other   54.or  55.but 

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