21 U.S. Customs officials acknowledge that no system is_________, and that most successful preventative
measures involve an ounce of luck.
(A)foolproof
(B)intrinsic
(C)replaceable
(D)antiquated
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統計: A(3), B(7), C(8), D(13), E(0) #2800522
統計: A(3), B(7), C(8), D(13), E(0) #2800522