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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(1)_____ died.
    Nearby, NATO naval forces were(2)_____ echo sounding devices meant to(3)_____ an enemy’s submarines, and public(4)_____ of the deaths ultimately came to(5)_____ suspicions of a link between whale distress and loud ocean noises.
    The theory is(6)_____ the mammals seek to (7)_____ the roar of the deep, rush toward the surface and in some cases end up going ashore.
    For decades, environmentalists have worked to reduce the undersea noise—usually with(8)_____ success, given the growing industrialization and militarization of the oceans. They have(9)_____suits and waged letter-writing campaigns,(10)_____ a recent petition that asks the United States Navy to(11)_____ its testing of underwater sound equipment.
    The discovery by biologists in Hawaii that whales can(12)_____ the sensitivity of their hearing to protect their ears from loud noise(13)_____ another dimension to the debate.
    Michael Jasny, a senior policy analyst, called the research fascinating and said he hoped it would prove(14)_____ in protecting whale hearing from these threats.
    But he(15)_____ the finding as a work in (16)_____ that posed many unanswered questions.
    "A lot more work needs(17)_____," he said. "Could it be replicated in the wild? It’s a huge question."
     (18)_____ whales could learn to decrease the sensitivity of their hearing, Mr. Jasny said, that would(19)_____only a relatively small part of the oceanic noise problem. "It’s important to understand that it’s(20)_____," he said of the proposed method. "It won’t be a silver bullet."
(6)
选项 A、which
B、whether
C、what
D、that
答案D
解析 空格后的句子结构、意思完整，故用that引导该表语从句。
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