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  3. Water projects in the United States gained a new rationale in the 1930s as the nation suffered its worst economic depression an

Water projects in the United States gained a new rationale in the 1930s as the nation suffered its worst economic depression an

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问题     Water projects in the United States gained a new rationale in
the 1930s as the nation suffered its worst economic depression and
the Great Plains region suffered its worst drought in recording【S1】______
history. As the economy sank into a deep depression and
employment rates increased, the political climate for direct federal【S2】______
government involvement in water projects improved. President
Franklin Roosevelt’s first 100 days in the office brought a number of【S3】______
new laws to deal the severe economic depression that became known【S4】______
as the Great Depression. Two of these laws, the Tennessee Valley
Authority Act of 1933 and the National Recovery Act of 1933
(NIRA), had particular significant for water resource development.【S5】______
    The natural pattern of the Tennessee River was characterized
by large spring flows produced destructive floods and low summer【S6】______
flows that inhibited navigation. The intensity and frequency of the
events discouraged development and contributed toward persistent【S7】______
poverty in the valley. To counter these natural obstacles, the
Tennessee Valley Authority Act of 1933 created the Tennessee
Valley Authority(TVA), a public agent with broad powers to【S8】______
promote development in the region, including the authority to build
dams and reservoirs and to generate and sell hydroelectric power.
The TVA is a unique institution on that it brings all the water-related【S9】______
functions of the federal government under a single body. The TVA
used its authority to transform the Tennessee River into one of the
more highly regulated rivers in the world within about two decades.【S10】______
The TVA inherited the Wilson Dam, and by the beginning of the
Second World War it had completed six additional multipurpose
dams with power plants and locks for navigation.
【S9】
选项
答案on—in
解析 固定搭配中的介词误用。that前后均是完整的句子，不缺成分，且前后两句话构成逻辑上的因果关系，故推知此处需要一个表因果的连词。in that有连词功能，表示“因为”。
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