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  3. 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

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.
【C18】
选项 A、in which
B、by which
C、in this way
D、that
答案D
解析
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