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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. Hous

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

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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 from cities and chemical runoff fromfarms, 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 rainforest.
   【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.
【C5】
选项 A、simple
B、beneficial
C、interesting
D、obvious
答案D
解析 本句承上启下，or之前的半句指前文所说的短时间内的巨大变化，并且变化是明显的。obvious意为“明显的”，符合题意。simple意为“简单的”，beneficial意为“有益的”，interesting意为“有趣的”。
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