Original usage refers to rivers that ______ . During the 20th century, ______ , abundant conflicts in use demand, and an intens

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问题 Original usage refers to rivers that ______ .
During the 20th century, ______ , abundant conflicts in use demand, and an intensification of use that has accelerated quickly.

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答案marked shifts in the appreciation of rivers

解析 该句明确提到The historical record includes marked shifts in the appreciation of rivers, numerous conflicts in use demand, and an intensification of use that has rapidly accelerated during the 20th century, 题干给出了其中的后两个内容,故所填内容即是该句中的marked shifts in the appreciation of rivers。
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