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CET 等级考试◆CET4題庫下載題庫

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53. It is said in some parts of the world, goats, rather than cows, serve as a vital ________ of milk.
(A) storage
(B) source
(C) reserve
(D) resource

答案：B
難度： 計算中


53. It is said in some parts of the worl..-阿摩線上測驗