39. What contribution did Gordon B. Kaufmann make to Hoover Dam?
(A) He improved the outer appearance of the dam.
(B) He enhanced the practical functions of the dam.
(C) He added aboriginal flavor to the design of the floor.
(D) He decorated the walls of the dam with images from nature.
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(A) He improved the ...
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題目翻譯及解析： 戈登·B·考夫曼對胡佛...
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