谁来帮帮忙？两道CR难题

mary1

1. The current proposal to give college students a broader choice in planning their own courses of study should be abandoned. The students who are supporting the proposal will never be satisfied, no matter what requirements are established. Some of these students have reached their third year without declaring a major. One first-year student has failed to complete four required courses. Several others have indicated a serious indifference to grades and intellectual achievement.
A flaw in the argument is that it does which one of the following?
(A) avoids the issue by focusing on supporters of the proposal
(B) argues circularly by assuming the conclusion is true in stating th e premises.
(C) fails to define the critical term "satisfied"
(D) distorts the proposal advocated by opponents
(E) users the term "student" equivocally
选A。我觉得文章论述没有什么flaw。C为什么不对？
2.The question whether intelligent life exists elsewhere in the universe is certainly imprecise, because we are not sure how different from use something might be and still count as "intelligent life" Yet we cannot just decide to define "intelligent life" in some more precise way since it is likely that we will find and recognize intelligent life elsewhere in the universe only if we leave our definitions open to new, unimagined possibilities.
The passage, if seen as an objection to an antecedent claim，challenges that claim by:
(A) showing the claim to be irrelevant to the issue at hand
(B) citing examples that fail to fit proposed definition of "intelligent life"
(C) claiming that "intelligent life" cannot be adequately defined.
(D) arguing that the claim, if acted on, would be counterproductive
(E) maintaining that the claim is not supported by the available evidence.
选D。这是怎么选出来的？文章本身不太明白。fficeffice" />

robert

1.the arguer does not support his argument with sufficient evidence since we cann't refute a claim just because its supporter are not doing fine. it is like the case of a book. u cannot declare that a book is not worth reading solely because its most readers are of little literature taste. instead,you have to show that the content of the book is trash.
2.from the passage we may infer that the "antecedent claim aims to establish the existence of "inteligent life". if the term "inteligent life" cannot be clearly defined , then the argument will be viewed as foundless. well , another example. if someone says that the flight crash is mainly due to inexperience of the pilot and at the same time he claims that it is difficult to measure how a pilot is experienced , then his argument is destined to be challenged.fficeffice" />