In the 19th century, it was common to hear people in Europe and America say that the resources of the sea were unlimited. For ex

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问题     In the 19th century, it was common to hear people in Europe and America say that the resources of the sea were unlimited. For example, a famous biologist said【C1】______the mid-1800s the resources of the sea were【C2】______. Today there’s【C3】______that the resources of the sea are as seriously threatened as【C4】______of the land and the air. 【C5】______, the threat to fish is greater【C6】______than the threat to birds and animals because fish are a【C7】______needed food resource. Many people throughout the world【C8】______fish as an important part of their food and a reduction【C9】______the fish supply could have wide【C10】______on hunger and population. Fishermen in the Atlantic, every year,【C11】______20 billion pounds of fish to【C12】______food demands. But it is important to【C13】______that these practices cannot continue【C14】______the using up of the fish resource within the next few years.
    Sea resources are【C15】______declining in many parts of the world and the problem cannot be【C16】______. It is only【C17】______care and planning in this generation【C18】______the food【C19】______of the sea can continue【C20】______future generations.
【C13】

选项 A、refer
B、represent
C、recognize
D、reveal

答案C

解析
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