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[audioFiles]2015m8x/audio_ezfj_ezflisteningd_20157_094[/audioFiles]

游客2023-11-04  7
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答案                     Endangered Animals—Extinction is Forever
    Extinction is the disappearance of an entire species, / which is brought about by natural or unnatural means. / Some species of plants and animals die out naturally / because newer species are more successful at competing for food and living space. / Others have become extinct because of changes in the planet / or because of natural disasters. / Dinosaurs, for example, may have died out because the climate became cooler. / It is said that there was a big cloud of dust that blocked out the sun. / In today’s world, however, / species mostly become extinct or are threatened with extinction because of humans. / Humans hunt animals, destroy their habitats, / and introduce other animals that prey upon the endangered animals or compete for their resources. / It is estimated that about 125 species of birds and 60 species of mammals / have become extinct since 1600. / Currently, there are approximately 1,100 species of birds and mammals that are facing extinction.
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