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GMAT逻辑题练习及答案(466)

2017-12-06 12:17:00 来源:网络GMAT资料下载

  GMAT逻辑题目:

  Theonly physical factor preventing a human journey to Mars has been weight.Carrying enough fuel to propel a conventional spacecraft to Mars and back wouldmake even the lightest craft too heavy to be launched from Earth. A device hasrecently been invented, however, that allows an otherwise conventionalspacecraft to refill the craft’s fuel tanks with fuel manufactured from theMartian atmosphere for the return trip. Therefore, it is possible for people togo to Mars in a spacecraft that carries this device and then return.

  Which one of the following is an assumptionon which the argument depends?

  A. Theamount of fuel needed for a spacecraft to return from Mars is the same as theamount of fuel needed to travel from Earth to Mars.

  B. Thefuel manufactured from the Martian atmosphere would not differ in compositionfrom the fuel used to travel to Mars.

  C. Thedevice for manufacturing fuel from the Martian atmosphere would not take up anyof the spaceship crew’s living space.

  D. Aconventional spacecraft equipped with the device would not be appreciably moreexpensive to construct than current spacecraft typically are.

  E. Thedevice for manufacturing fuel for the return to Earth weighs less than thetanks of fuel that a conventional spacecraft would otherwise need to carry fromEarth for the return trip.

  答案见下一页:

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