U.S. Customs officials acknowledge that no system is ___, and that most successful preventative measures involve an ounce of luck.
Afoolproof正確答案
Bintrinsic
Creplaceable
Dantiquated
答案與詳解
為什麼答案是 A
foolproof = 萬無一失的、連傻瓜都不會出錯的。海關承認「沒有系統是萬無一失」且成功預防多半還需一點運氣，語意完全契合。
考點：萬無一失考點：本質的考點：可替換考點：過時的
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