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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.
【C15】
选项 A、even
B、far
C、less
D、more
答案D
解析 前面说了栖息地越来越小，物种已不能适应其环境，因此他们处于更加危险的境地，更加濒危，more endangered。选项D正确。
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