LSAT 3-1-14;LSAT 3-4-5

zjxmlily

LSAT 3-1-14
14. The average level of fat in the blood of people suffering from acute cases of disease W is lower than the average level for the population as a whole. Nevertheless, most doctors believe that reducing blood-fat levels is an effective way of preventing acute W.
Which one of the following, if true, does most to justify this apparently paradoxical belief?
(A) The blood level of fat for patients who have been cured of W is on average the same as that for the population at large.
(B) Several of the symptoms characteristic of acute W have been produced in laboratory animals fed large doses of a synthetic fat substitute, though acute W itself has not been produced in this way.
(C) The progression from latent to acute W can occur only when the agent that causes acute W absorbs large quantities of fat from the patient's blood.
(D) The levels of fat in the blood of patients who have disease W respond abnormally slowly to changes in dietary intake of fat.
(E) High levels of fat in the blood are indicative of several diseases that are just as serious as W.

the key is c
my question is how the answer C explain the paradoxical belief, I just could conclude that the answer can explain the former part in the question, but how  it explains the latter part in the question(reducing blood-fat levels is an effective way of preventing acute W)?

LSAT 3-4-5

5. Most parents who are generous are good parents, but some self-centered parents are also good parents.
Yet all good parents share one characteristic; they are good listeners.
If all of the statements in the passage are true, which one of the following must also be true?
(A) All parents who are good listeners are good parents.
(B) Some parents who are good listeners are not good parent.
(C) Most parents who are good listeners are generous.
(D) Some parents who are good listeners are self-centered
(E) Fewer self-centered parents than generous parents are good listeners.

The key is D
I know the other four are all false, but I feel that the answer D is also wrong.
I can say that some parents who are good listeners are not self-centered, it is also not contradict with the question, so I can not infer that the answer D must also be true

albert

1. C tell us that absoring high level of fat is a required condition to triger the disease, therefore reducing blood-fat level is an effective way to control the occurrence of the disease.

2. most parent are good parents, and all good parents are good listener
some self-centered parents are also good parents.

therefore some self-centered parents are good listener.

therefore some parents who are good listener are also self-centered.

zjxmlily

以下是引用albert在2003-7-25 20:41:00的发言：

2. most parent are good parents, and all good parents are good listener
  some self-centered parents are also good parents.

therefore some self-centered parents are good listener.

therefore some parents who are good listener are also self-centered.

therefore some parents who are good listener are also self-centered.
这一句应该不是必然推出的吧，只能说可以成立，那为什么不选B呢？它也是不能必然推出，但是也是有成立的可能的啊？

ironfish

a. Because you can't say that parents who are good listeners are ALL not self-centered.
It means that some of them are self-centered.