1.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?
A: if a biometric access-control system reliable prevents impostors from being admitted, it will sometimes turn away legitimate access-seekers.
2.One variety of partially biodegradable plastic beverage container is manufacturaed from small bits of plastic bound together by a degradable bonding agent such as cornstarch. Since only the bonding agent degrades, leaving the small bits of plastic, no less plastic refuse per container is produced when such containers are discarded than when comparable nonbiodegradable containers are discarded.
Which of the following, if true, most strengthens the argument above?
The partially biodegradable plastic beverage containers are made with more plastic than comparable nonbiodegradable ones in order to compensate for the weakening effect of the bonding agents.
A: worked by (degrees of similarity) not by identity + even the same finger will (rarely leave exactly identical) prints + to minimize refusals of access to legitimate access-seekers -> increase the likelihood of admitting impostors
==> if a biometric access-control system (reliable prevents impostors) from being admitted, it will (sometimes turn away legitimate access-seekers).
2. Conclusion: no less plastic produce
support Answer: are made with more plastic than
2.
第一题：最重要的一句Such systems can be adjusted to minimize refusals of access to legitimate access-seekers. Such adjustments however, increase the likelihood of admitting impostors.说这种系统可以用来减少拒绝合法者的可能性，但是也不可避免的增加错误的可能性。这是此题的结论。（注意中间有一个转折）
而选项A正是这个结论的一个同义变换，起了加强结论的作用。
