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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.  
【C15】
选项 A、Although
B、Thus
C、In spite of
D、Even so
答案D
解析 逻辑衔接题。本句意为；还存在安全和耐用性问题。上文是说能控制过度捕捞。这里又提到安全和耐用性问题，推测应为让步关系。故选Even so“即便如此”。
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