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GMAT逻辑练习题14(附答案)(2)

2012-08-01 
GMAT逻辑练习题

  Prep2012-Pack1-CR-069 VCR005518 Hard

  Southington University's fund-raisers succeeded in getting donations from 80 percent of the potential donors they contacted this year. This rate would be the expected rate if the only potential donors contacted were those who have donated in the past. But good fund-raisers constantly contact less likely prospects in an effort to expand the donor base. Thus the high success rate, far from showing that the fund-raisers did a good job, shows insufficient canvassing effort.

  Which of the following, if true, most seriously weakens the argument?

  A. Among potential donors contacted by Southington University's fund-raisers, the majority of those who did not make donations were people who had made donations to the university in the past.

  B. The amount of money raised by Southington University's fundraisers this year was lower than the amount they had raised in any of the previous several years.

  C. Individual donations made to Southington University this year were, on average, slightly larger than were average individual donations made to many other universities.

  D. Fund-raisers contacting past donors are not only to get new donations but also to get names of potential new donors to contact.

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

  Prep2012-Pack1-CR-070 VCR005704 Hard

  Frobisher, a sixteenth-century English explorer, had soil samples from Canada's Kodlunarn Island examined for gold content. Because high gold content was reported, Elizabeth I funded two mining expeditions. Neither expedition found any gold there. Modern analysis of the island's soil indicates a very low gold content. Thus the methods used to determine the gold content of Frobisher‘s samples must have been inaccurate.

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

  A. The gold content of the soil on Kodlunarn Island is much lower today than it was in the sixteenth century.

  B. The two mining expeditions funded by I did not mine the same part of Kodlunarn Island.

  C. The methods used to assess gold content of the soil samples provided by Frobisher were different from those generally used in the sixteenth century.

  D. Frobisher did not have soil samples from any other Canadian island examined for gold content.

  E. Gold was not added to the samples collected by Frobisher before the samples were examined.

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