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  3. During the nineteenth century, when little was known about environmentalism and conservation, it was common to hear people in Eu

During the nineteenth century, when little was known about environmentalism and conservation, it was common to hear people in Eu

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问题     During the nineteenth century, when little was known about environmentalism and conservation, it was common to hear people in Europe and America say that the resources of the sea were unlimited. They believed the world and nature would【B1】______ reproduce all the resources they would need. For example, a【B2】______biologist writing in the mid-nineteenth century【B3】______that none of the great sea fisheries were to be【B4】______. Today, though, there is evidence that the resources of the sea are seriously endangered.
    【B5】______, environmentalists have focused their attention on the land and air. Recently, however, they are beginning to discover that the resources of the sea are in as much danger. The list of endangered【B6】______now included herring and crabs as well as the African elephant, Indian tiger, and the American eagle.
    【B7】______, the threats to fish are more【B8】______in some ways than the threats to animals and birds. This is because【B9】______. Hence, a decline in the fish supply could have extensive effects on hunger and population. Fishermen in the North Atlantic alone【B10】______without depleting fish reserves within the next few years. Rapidly declining sea resources in many parts of the world are problems that cannot be ignored any longer.【B11】______
【B4】
选项
答案exhausted
解析 此处所在句由For example引导，语义上用以解释说明前一句的内容(海洋资源无尽)，所以，在从句主语是none of the great sea fisheries(表示否定含义)的情况下，谓语部分be后面的内容应该表示“是可以穷尽的”的含义。从语法形式上看．本空位于were to be的后面，应当用动词的一ed或-ing形式，或者用形容词。注意本词的拼写，尤其是h的位置。
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