Feifei－95第一句话的作用是什么？

Which one of the following is an assumption
on which the argument depends?

(A) Prolific writers can inflate the number
of citations they receive by citing themselves in subsequent papers.

(B) It is possible to ascertain whether or
not a paper is the product of international collaboration by determining the
number of citations it has received.

(C) The number of citations a paper
receives is a measure of the importance of the research it reports.

(D) The collaborative efforts of scientists
who are citizens of the same country do not produce papers that are as
important as papers that are produced by international collaboration.

(E) International research teams tend to be
more generously funded than are single researchers.

这题选C，我想问的是 第一句话的作用是什么？前提？结论？

而且仅看第一句话Scientific research that involves
international collaboration has produced papers of greater influence, as
measured by the number of times a paper is cited in subsequent papers, than has
research without any collaboration.就已经说的是C的意思了，还用推理么？

还有B为什么错了呢？取非为什么不能削弱呢？

以下是引用mariewoo在2006-8-16 21:39:00的发言：
95. Scientific research that involves
international collaboration has produced papers of greater influence, as
measured by the number of times a paper is cited in subsequent papers, than has
research without any collaboration. Papers that result from international
collaboration are cited an average of seven times, whereas papers with single
authors are cited only three times on average. This difference shows that
research projects conducted by international research teams are of greater importance than those conducted by single
researchers.
 

Which one of the following is an assumption
on which the argument depends?

(B) It is possible to ascertain whether or
not a paper is the product of international collaboration by determining the
number of citations it has received.  

(C) The number of citations a paper
receives is a measure of the importance of the research it reports.

 这题选C，我想问的是 第一句话的作用是什么？前提？结论？

而且仅看第一句话Scientific research that involves
international collaboration has produced papers of greater influence, as
measured by the number of times a paper is cited in subsequent papers, than has
research without any collaboration.就已经说的是C的意思了，还用推理么？

还有B为什么错了呢？取非为什么不能削弱呢？

有点晕了，请NN帮忙！谢谢

我想是前提，第一句话和结论中间有个GAP，而且从第一句话

Scientific research that involves international collaboration has produced papers of greater influence, as measured by the number of times a paper is cited in subsequent papers, than has research without any collaboration.第一句话的主干是黑体字，as后是对greater influence的定义---衡量标准是文章被引用次数；A比B影响力大

 apers that result from international collaboration are cited an average of seven times, whereas papers with single authors are cited only three times on average. 第二句是对第一句的具体化，数字证明7 vs 3

This difference shows that research projects conducted by international research teams are of greater importance than those conducted by single researchers. 而结论却得出A比B重要，这是前面两部分推不出来的，影响力==〉重要中间的gap就是重要程度的衡量标准和衡量影响力一样。

我讲话向来如此罗索。。。。。。。拙见

不好意思对于取非，我不太会用。。。。。。但是觉得B只是原文前提部分的重复，没有架桥