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CET 等级考试◆CET4題庫下載題庫

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40. Deserts and high mountains have always been a ______ to the movement of people from place to place.
(A) barrier
(B) fence
(C) prevention
(D) jam

答案：A
難度： 計算中


40. Deserts and high mountains have alwa..-阿摩線上測驗