Unless measures are taken at once, there is a possibility that all the oceans of the world will be dead by the next century. How

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问题     Unless measures are taken at once, there is a possibility that all the oceans of the world will be dead by the next century. How can this possibly happen?
    We have already seen that people【C1】______all kinds of waste products to be thrown into the sea. It is almost【C2】______to measure how much industrial waste ends up in our oceans, but we can【C3】______how much oil is poured into them according to the law and against the law. It is against the law to pour oil into the sea【C4】______to the shore, but when a ship is many miles out to the sea there are no such【C5】______. Estimate of the amount of oil poured in European Waters【C6】______is about 200,000 tons every year. Some people say the【C7】______could be ten times as high around the world.
    It is not only our【C8】______that suffer from oil pollution. Among other things, many fish now contain very high amounts of【C9】______substances. Next time you have fish to eat, how can you be sure that they are free from oil pollution? You cannot see the【C10】______and you cannot taste them, either. It is really quite a problem.
    Nearly all of the countries are trying hard to prevent and control oil pollution. We hope that the day will soon come when fish will be free from oil pollution.
    A. limitations B. seashores C. allow D. invade
    E. close F. poisonous G. afterwards H. agenda
    I. edit J. figure K. impossible L. alone
    M. effects N. calculate O. extensive
【C3】

选项

答案N

解析 此处应为动词原形。根据but一词表示的转折关系,可以推断空白处的动词应与前面分句中的measure一词近义,因此答案为calculate。
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