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  3. More artificial reefs(礁石)are being lowered into the ocean now than ever before. But as artificial-reef initiatives grow to inclu

More artificial reefs(礁石)are being lowered into the ocean now than ever before. But as artificial-reef initiatives grow to inclu

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问题     More artificial reefs(礁石)are being lowered into the ocean now than ever before. But as artificial-reef initiatives grow to include more coastal regions and a wider【C1】______of aged infrastructure(基础设施), some scientists worry that the commercial interests of fishing, diving and trash【C2】______are driving efforts that should be environmental. 【C3】______that’s the case, they warn. 【C4】______reefs may ultimately give way to an underwater junkyard. "【C5】______it’s one of these things where people take a very【C6】______view—drop something in the water and a bunch of fish come and that’s wonderful, " says Bohnsack, a fisheries biologist. "The reality is not so simple. "
    Do man-made reefs【C7】______ecosystems that have been destroyed by pollution, overfishing and global warming? Or do they merely attract existing populations away from natural habitats(栖息地), concentrating them【C8】______unnatural ways and making them more【C9】______to overfishing? "In a lot of cases, that question has been answered, " says Bohnsack. "But supporters of reefing aren’t too happy with the answer, so they【C10】______it. " Research shows that artificial reefs only【C11】______fish populations when habitat is the limiting factor. In many cases. it isn’t. Overfishing is the bigger criminal, and artificial reefs only make the problem【C12】______.
    Not everyone agrees. By【C13】______fishing restrictions, reef coordinators say they can【C14】______against the overfishing of vulnerable species. They believe the overfishing issue is manageable.
    【C15】______, there’s the question of safety and durability. The government is still cleaning up an ill-fated 1970s attempt at artificial reefing that employed more than 2 million tires【C16】______together with weak metal clips off the coast of southern Florida. The tires came【C17】______from one another during a rash of【C18】______storms. Since then, they have been【C19】______around the ocean floor, destroying natural reefs, polluting the water and occasionally washing【C20】______on shore.  
【C11】
选项 A、save
B、discover
C、enhance
D、confirm
答案C
解析 动词辨析题。本处意思是：研究显示人工礁石只有在栖息地成为限制因素的情况下才能提高鱼群数量。根据上下文推测天然礁石只有在特定的情况下才有利，故选enhance“提高，加强”。
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