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  3. The destruction of habitats(栖息地) all over the world is the primary reason species are becoming extinct(灭绝) or endangered. Houses

The destruction of habitats(栖息地) all over the world is the primary reason species are becoming extinct(灭绝) or endangered. Houses

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问题     The destruction of habitats(栖息地) all over the world is the primary reason species are becoming extinct(灭绝) or endangered. Houses, highways, dams, industrial buildings, and ever-spreading farms now dominate【C1】________formerly occupied by forests, deserts, and wetlands.【C2】________the beginning of European settlement in America,【C3】________, over 65,000,000 acres of wetlands have been drained. One million acres alone vanished【C4】________1985 and 1995.
    Habitat destruction can be【C5】________or it can be subtle, occurring over a【C6】________period of time without being noticed. 【C7】________, such as sewage(污水) from cities and chemical runoff from farms, can change the【C8】________and quantity of water in streams and rivers. To【C9】________living in a delicately balanced habitat, this disturbance can be as【C10】________ as the clear-cutting of a rain forest.
    【C11】________remaining habitats are carved into smaller and smaller pockets or islands, remaining species are forced to exist in these【C12】________areas, which causes further habitat 【C13】________These species become less adaptable to environmental【C14】________; in fact, they become【C15】________ endangered. Scientists believe that when a habitat is cut by 90%, one-half of its plants, animals and insects will become extinct.
【C8】
选项 A、quality
B、purity
C、nature
D、amount
答案A
解析 Quality质量，purity纯洁，nature自然，amount数量。前面提到的污染物肯定会改变小溪和河流中水的质量。选项A正确。
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