2. 外语
  3. Seafood could be going off a lot of menus as the world warms. More than half of a group of fish【C1】______ for the marine food we

Seafood could be going off a lot of menus as the world warms. More than half of a group of fish【C1】______ for the marine food we

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问题     Seafood could be going off a lot of menus as the world warms. More than half of a group of fish【C1】______ for the marine food web might die if, as 【C2】______, global warming reduces the amount of oxygen【C3】______ in some critical areas of the ocean—including some of our richest fisheries.
    The prediction【C4】______a unique set of records that goes back to 1951. California has regularly【C5】______ its baby fish to support the sardine fishery. "There is almost no other dataset going back so far that【C6】______every kind of fish," says Tony Koslow of the Scripps Institution of Oceanography in La Jolla, California, who heads the survey. The survey records also include information 【C7】______ water temperature, the 【C8】______proportion of salt in a solution and the dissolved oxygen content.
    Koslow’s team studied records of 86 fish species found【C9】______ in the samples and discovered that the abundance of 27 of them【C10】______ strongly with the amount of oxygen 200 to 400 metres down; a 20 percent drop in oxygen meant a 63 percent drop in the fish. There have been several【C11】______of low oxygen during the period【C12】______, mainly in the 1950s and since 1984. Global climate models predict that 20 to 40 percent of the oxygen at these depths will disappear over the next century 【C13】______ wanning, says Koslow— mainly because these waters get oxygen by mixing with【C14】______ waters. Warmer, lighter surface waters are less likely to mix with the colder, denser waters【C15】______.
    Of the 27 species most【C16】______ by low oxygen, says Koslow, 24 were fish that spend the daytime in deep, dark waters below 200 metres to【C17】______ predators that hunt by【C18】______. There are 10 billion tonnes of fish globally—10 times the annual global commercial【C19】______—and they are a vital food for other fish and【C20】______ birds and mammals.
【C13】
选项 A、due to
B、leading to
C、for the sake of
D、on account of
答案A
解析 短语辨析题。句意为：据预测，由于气候变暖，在下个世纪，这一深度的海水中的氧气将消失。根据上下文可判断此处应为因果关系，前果后因，所以首先排除[B]leading to“导致”。[A]due to“归因于，由于”，后面接直接原因，符合句意，故为答案。[C]for the sake of“出于某种考虑，为了某方面的利益”；[D]on account of“为了……的缘故，考虑到……”，与句意不符，故排除。
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