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  3. During the 19th century, it was common to hear people in Europe and America say that the sources of the sea were S1

During the 19th century, it was common to hear people in Europe and America say that the sources of the sea were S1

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问题     During the 19th century, it was common to hear people
in Europe and America say that the sources of the sea were              S1. ______
unlimited. For example, a noted American biologist in the
mid 19th century commented that none of the great sea
fisheries are to be exhausting. Today though, there is                  S2. ______
evidences that the resources of the sea are as seriously                S3. ______
endangered as that of the land and the air, and that the                S4. ______
endangered species include Herring and Carp as well as the
African Elephant, Indian Tiger, and the American Eagle.
Further, the threats to fish are more alarmed in some ways              S5. ______
than the threats to animals and birds. This is because of fish          S6. ______
is a much needed food resource and people throughout the
world depend on fish as an important part of their dish, and
the decline in the fish supply could have extensive effects in          S7. ______
hunger and population. Fishermen in the North Atlantic
alone annual harvest 20 billion pounds of fish to satisfy food          S8. ______
demands, but it is important to recognize that these practices
cannot continue without depleting fish storage within the next
few years. Sea resources are rapid declining in many parts of the       S9. ______
world, and the problem cannot ignore. We can predict that food          S10. ______
supplies in the sea cannot last forever.
选项
答案sources改为resources
解析 根据文章的内容，本文主要讲的是鱼作为一种资源的情况。source(来源)应当改为resource(资源)。
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大学英语四级

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