LSAT－12－2－15

15.(B)   A standard problem for computer security is that passwords that have to be typed on a computer keyboard are comparatively easy for unauthorized users to steal or guess. A new system that relies on recognizing the voices of authorized users apparently avoids this problem. In a small initial trial, the system never incorrectly accepted someone seeking access to the computer’s data. Clearly, if this result can be repeated in an operational setting, then there will be a way of giving access to those people who are entitled to access and to no one else.

The reasoning above is flawed because it

(A) makes a faulty comparison, in that a security system based on voice recognition would not be expected to suffer from the same problems as one that relied on passwords entered from a keyboard

(B) bases a general conclusion on a small amount of data

(C) fails to recognize that a security system based on voice recognition could easily have applications other than computer security

(D) ignores the possibility that the system sometimes denies access to people who are entitled to access（D）

(E) states its conclusion in a heavily qualified way

As indicated in this sentence  “there will be a way of giving access to those people who are entitled to access and to no one else.”We can get the conclusion:

1.give access to those people who are entiltled

2.give access to no one else

How can you know D is the correct one ?

觉得文中的这句话In a small initial trial, the system never incorrectly accepted someone seeking access to the computer’s data倒是可以infer 出(B) :bases a general conclusion on a small amount of data

"the system never incorrectly accepted someone seeking access to the computer’s data-------it only indicates that the system always deny the access of people who are not entitled to the system. But it does not guarantee that people who are entitled, can always go through the system.

"觉得文中的这句话In a small initial trial, the system never incorrectly accepted someone seeking access to the computer’s data倒是可以infer 出(B) :bases a general conclusion on a small amount of data" -------I agree with you

However, it can not become the choice, because the conclusion of the original text is qualified by "if this result can be repeated in an operational setting"