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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.
【C6】
选项 A、see
B、find
C、witness
D、consider
答案C
解析 本句提到人们早就明白人类活动在破坏海洋，从破折号可看出后面的内容是对破坏作进一步阐述和解释。夏季北极冰块在消融和海洋生物在死亡都是人们破坏海洋的具体例子，C项witness有“亲眼见证，……就是证据”之意，符合句意。A项see“看到”指直观地看到眼前正在发生的具体事情，不适用于本句语境。另外，这些具体的事例也不是找到(B项find)或是考虑到(D项consider)的。
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