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CET 等级考试◆CET6題庫下載題庫

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27.
(A) They may affect the results of experiments.
(B) They may behave abnormally.
(C) They may breed out of control.
(D) They may cause damage to the environment.

答案：C
難度： 非常困難


27. (A) They may affect the results of e..-阿摩線上測驗