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  3. In September, more than a dozen whales beached themselves in the Canary Islands. Rescuers tried to water down the whales and kee

In September, more than a dozen whales beached themselves in the Canary Islands. Rescuers tried to water down the whales and kee

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问题     In September, more than a dozen whales beached themselves in the Canary Islands. Rescuers tried to water down the whales and keep them cool. But all of them【C1】______died.
    Nearby, NATO naval forces were【C2】______echo sounding devices meant to【C3】______an enemy’s submarines, and public【C4】______of the deaths ultimately came to【C5】______suspicions of a link between whale distress and loud ocean noises.
    The theory is that the mammals seek to【C6】______the roar of the deep, rush toward the surface and in some cases end up going【C7】______.
    For decades, environmentalists have worked to reduce the undersea noise—usually with【C8】______success, given the growing industrialization and militarization of the oceans. They have【C9】______suits and waged letter-writing campaigns,【C10】______a recent petition that asks the United States Navy to【C11】______its testing of underwater sound equipment
    The discovery by biologists in Hawaii that whales can【C12】______the sensitivity of their hearing to protect their ears from loud noise adds another dimension to the【C13】______.
    Michael Jasny, a senior policy analyst, called the research fascinating and said he hoped it would prove【C14】______in protecting whale hearing from these threats.
    But he【C15】______the finding as a work in【C16】______that posed many unanswered questions.
    "A lot more work needs【C17】______," he said. "Could it be replicated in the wild? It’s a huge question."
   【C18】______whales could learn to decrease the sensitivity of their hearing, Mr. Jasny said, that would【C19】______only a relatively small part of the oceanic noise problem. "It’s important to understand that it’s【C20】______," he said of the proposed method. "It won’t be a silver bullet."
【C20】
选项 A、true
B、useless
C、limited
D、risky
答案C
解析 后文的silver bullet字面意思是“银色子弹”，指“良方”。空格处应与silver bullet语义相反。故填入C项limited“有限的”。
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