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【单选题】

It can be inferred from the third paragraph that in the mid-twentieth century ________.
A.there was no great adverse effect of human activities upon ocean ecosystems

B.no other human activities but navigation caused marine pollution
C.maritime countries still favored the freedom to fish in the open-seas
D.the lack of technology for further exploitation partly prevented marine pollution
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根据网考网移动考试中心的统计,该试题:

31%的考友选择了A选项

9%的考友选择了B选项

4%的考友选择了C选项

56%的考友选择了D选项

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