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試卷：無年度 - 96年5月TOFEL閱讀(Page39-40)#20918 | 科目：TOEFL(Test of English as a Foreign Language)托福

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試卷名稱：無年度 - 96年5月TOFEL閱讀(Page39-40)#20918

科目：TOEFL(Test of English as a Foreign Language)托福

33. What is the passage mainly about?
(A) Steamboat engines in the western United States
(B) River travel in the western United States
(C) A famous United States inventor
(D) The world's first practical steamboat

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