一道CR，求答案 - ChaseDream

Smithtown
University’s fund-raisers succeeded in getting donations from 80 percent of the potential donors they contacted. This success rate, exceptionally high for university fund-raisers, does not indicate that they were doing a good job. On
the contrary, since the people most likely to donate are those who have
donated in the past, good fund-raisers constantly try less-likely
prospects in an effort to expand the donor base. The high success rate shows insufficient canvassing effort.

Which of the following, if true, provides more support for the argument?

A. Smithtown
University’s
fund-raisers were successful in their contacts with potential donors
who had never given before about as frequently as were fund-raisers for
other universities in their contacts with such people.

B. This year the average size of the donations to Smithtown
University
from new donors when the university’s fund-raisers had contacted was
larger than the average size of donations from donors who had given to
the university before.

C. This year most of the donations that came to Smithtown
University
from people who had previously donated to it were made without the
university’s fund-raisers having made any contact with the donors.

D. The majority of the donations that fund-raisers succeeded in getting for Smithtown
University this year were from donors who had never given to the university before.

E. More than half of the money raised by Smithtown
University’s fund-raisers came from donors who had never previously donated to the university.

GWD31给的答案是C, GWD24给的是A，到底答案是那个啊？

这么想：TOTAL DONATORS=OLD DONATORS+NEW DONATORS, 该校的Total Donators数量比别的学校多，而A中说NEW DONATOR数量该校和别的学校没什么区别，那么就说明主要的优势在于OLD DONATOR比较多，加强了原文观点。（严谨一点的话涉及到一个成功率相比的问题，其实思路是一样的）

C错了，因为正文第一句的前提是“of the potential donors they contacted”，C中所说的未被CONTACTED的捐助者其实是无关信息，不说明问题。

A)只说明SU做的和其他大学资金募集者接触资助者频率一样多；