标题: P213 159 [打印本页]
作者: piqiuwawa 时间: 2005-8-16 06:39 标题: P213 159
P213 159
Biometric access-control systems---those using fingerprints, voiceprints, etc., 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?
(B) If a biometric access-control system reliable 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 problem than is mistaken refusal of access.
能帮我分析一下这道题吗？conclusion 和evidence各是什么？我选了C，C是不是错在only上？那请问B为何正确？我觉得原文只交代了一种相反的情况的可能性，不能由此推出B的 情况。
作者: efficiency 时间: 2005-8-16 13:39
原文中不是有the same finger will rarely leave exactly identical prints
如果进门得时候要求指纹完全一样，那么就算同一个人也会有很多不一样得时候，所以他自己也就会有被拒绝得时候了
作者: woodruff1 时间: 2005-8-17 06:39
C 不是错在only 上面，是错在说反了。
admittance of impostors is less of a problem than is mistaken refusal
of access.
既然这种系统会拒绝正确的进入者，为什么还用它？就是因为人们认为，阻止
imposter 比发生mistaken refusal 更重要。
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