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  3. About 3 billion people live within 100 miles (160km) of the sea, a number that could double in the next decade as humans flock t

About 3 billion people live within 100 miles (160km) of the sea, a number that could double in the next decade as humans flock t

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问题     About 3 billion people live within 100 miles (160km) of the sea, a number that could double in the next decade as humans flock to coastal cities. The oceans produce $3 trillion of goods and services each year and untold【C1】________for the Earth’s ecology. life could not exist【C2】________these vast water reserves—and, if anything, they are becoming even more important to humans than before.
    Mining is about to begin under the seabed in the high seas. New summer shipping lanes are opening【C3】________the Arctic Ocean. The genetic resources of marine life promise a big【C4】________: the number of patents has been rising at 12% a year.
    But these developments are【C5】________compared with vaster forces reshaping the Earth, both on land and at sea. It has long been clear that people are damaging the oceans—【C6】________the melting of the Arctic ice in summer and the death of marine lives. Now, the【C7】________of that damage are starting to be felt onshore.
    Thailand provides a【C8】________example. In the 1990s it cleared coastal plants to set up fish farms. Ocean storm surges in 2011, no longer【C9】________by the plants, rushed in to【C10】________the country’s industrial heartland, causing billions of dollars of damage.
    More【C11】________is the global mismanagement of fish stocks. About 3 billion people get a fifth of then-protein from fish, making it a more important protein source than beef.【C12】________a vicious cycle has developed as fish stocks decline and fishermen【C13】________to grab what they can of the remainder.【C14】________the Food and Agriculture Organization, a third of fish stocks in the oceans are over-exploited. People could be eating much better, were fishing stocks【C15】________managed.
    The forests are often called the lungs of the Earth, but the description better fits the oceans. They produce half the world’s【C16】________of oxygen. At the moment, the oceans are moderating the【C17】________of global warming— though that may not【C18】________This  cannot be good news,【C19】________scientists are still debating the likely consequences.【C20】________, the decades of damage imposed on the oceans are now damaging the environment on land.
【C3】
选项 A、under
B、across
C、around
D、above
答案B
解析 本句提到正在开辟夏季新航道，航道是指在水域内供船舶航行的通道，可推测出后面的北冰洋就是航道的水域范围。B项across有“跨越，穿越”之意，指从一定范围的一边到另一边，符合语义逻辑。航道不可能位于海洋下面，这样船舶无法航行，故排除A项under。C项around“在……周围”，航道是建在海上的通道，而不是海的周围。D项above“在……之上”，用在这里表示位置高于海洋，不符合逻辑。
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