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GMAT逻辑题练习及答案(254)

2017-04-25 09:15:00来源:网络

  GMAT逻辑答案:

  答案

  【逻辑】

  Reasoning

  What piece of informationmust be an implicit part of the argument in order for the argument to succeed?The proposed method assumes that the oceans were initially salt-free and thatthe amount of salt entering them in the past century was roughly the averageamount that has entered them per century since they formed. Since the methodrelies solely on the rate at which rivers have deposited salt in the oceans, italso assumes that all or almost all salt in the oceans was deposited by rivers.Therefore, look for an answer option that follows from these assumptions.

  A. Correct. Since the argument assumes thatthe amount of salt entering the oceans in the past century has been typical andthat rivers deposited all or almost all the salt in the oceans, it must alsoassume that the amount of salt rivers have deposited in the oceans in the pastcentury has been typical.

  B. The argument assumes that therate at which rivers have collectively deposited salt into the oceans in thepast century has been typical, but different rivers could still have differentsalt levels from each other.

  C. As explained above, theargument assumes that all or almost all salt in the oceans came there fromrivers, not out of the ocean floor.

  D. D Provided that the proposedmethod is accurate, there is no need for the argument to assume that it is also"superior" to any other methods—some of which might be not onlyaccurate but also superior in virtue of being easier, cheaper, or more elegant.

  E. E The proposed method may yieldan accurate result even if biological activity uses up some of the ocean'ssalts, as long as the rate at which that activity has occurred in the pastcentury has been roughly the average rate since the oceans formed.

  The correct answer is A.

  以上就是新东方在线GER频道为你带来的GMAT逻辑题练习。更多精彩敬请关注新东方在线GMAT频道。

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