陈向东那本书上的2道题不会，请大家帮忙解释

CXD.P24610    Masterpieces
            of literature are “intertextual,” that is, they tend to be written in response not to reality but to other works of literature. To the extent that a writing is intertextual, it becomes clouded as a mirror of social reality.

The statements above provide the most support for which of the following conclusions?

A.      To the extent that a writing fails to mirror social reality, the writing is intertextual.

B.      The author who wishes to write a masterpiece should avoid being influenced by other works of literature.

C.      A writing that is not inertextual can have no significant relationship to any other writings.

D.     Literary masterpieces of the past are suspect as sources of information about the social reality of the past.

E.      A work of literature is not intertextual if it is written in response to a writing that accurately mirrors social reality.

正确答案是D，为什么不选A

CXD.P26444  Biometric access-control systems-those using finger-prints, 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?

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 problem than is mistaken refusal of access.

D.     Nonbiometric access-control systems-based, for example, on numerical codes-are less likely 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.

正确答案是：B   为什不选C

请大家告诉我是怎么得出正确答案和解题思路。谢谢了啊