OG11-紫51(支持難題)

Kath1985

Biometric access-control systems-those using fingerprints, voiceprints, and so forth, to regulate admittance to restricted areas-work by degrees of similarity, not by identity. After all, even the same finger will rarely leave exactly identical prints. Such systems can be adjusted to minimize refusals of access to legitimate access-seekers. Such adjustments, however, increase the likelihood of admitting impostors.

Which of the following conclusions is most strongly supported by the information above?

(A)If a biometric access-control system were made to work by identity, it would not produce any correct admittance decisions.

(B)If a biometric access-control system reliably prevents impostors from being admitted, it will sometimes turn away legitimate access-seekers.
(C)Biometric access-control systems are appropriate only in situations in which admittance of impostors is less of a
(D)No biometric access-control systems-based, for example, on numerical codes-are Islikely than biometric ones to admit impostors.
 (E) Anyone choosing an access-control system should base the choice solely on the ratio of false refusals to false admittances.
答案B 查過前人帖 但都是難懂的逆否命題解釋  
這題是要找前提支持結論嗎 ? 請問有沒有更容易明白B的解釋呢 ?  感謝

Kath1985

原諒我的腦子鈍
題目明明說合法者被電腦拒絕次數少了,表示電腦變更嚴格了,為什麼還說冒充者進入的情形更多了呢?

hughlv

不是找前提支持结论，而是从给出的事实来推导出一个可靠的结论。

题目中在讨论降低系统敏感度的必要性和可能后果，可以推断出不降低的话会有其他的问题。总结起来题目中已经很清楚：太严格会误杀，不严格会误放。