GMAT考试逻辑试题指导

1. Although 90 percent of the population believes itself to be wellinFORMed about health care, only 20 percent knows enough about DNA. Soapparently at least 80 percent of the population does not know enoughabout medical concepts to make well-inFORMed personal medical choicesor to make good public policy decisions about health care.
The argument's reasoning is questionable because the argument fails to demonstrate that
(A) those people who can understand news stories about DNA are able to make well-inFORMed personal medical choices
(B) more than 20 percent of the population needs to be wellinFORMed about health care for good public policy decisions abouthealth care to be made
(C) one's being able to make well-inFORMed personal medical choicesensures that one makes good public policy decisions about health care
(D) an understanding of DNA is essential to making well-inFORMedpersonal medical choices or to making good public policy decisionsabout health care
(E) since 90 percent of the population believes itself to be wellinFORMed about health care, at least 70 percent of the population ismistaken in that belief.

2. During the 1980's, Japanesecollectors were very active in the market for European art, especiallyas purchasers of nineteenth-century Impressionist paintings. Thisstriking pattern surely reflects a specific preference on the part ofmany Japanese collectors for certain aesthetic attributes they found innineteenth-century Impressionist paintings.
Which one of the following, if true, most strongly supports the explanation above?
(A) Impressionist paintings first became popular among art collectors in Europe at the beginning of the twentieth century.
(B) During the 1980's, the Japanese economy underwent a sustainedexpansion that was unprecedented in the country's recent history.
(C) Several nineteenth-century Impressionist painters adoptedcertain techniques and visual effects found in Japanese prints that arehighly estee
3. The average cable television company offers its customers 50channels, but new fiber-optic lines will enable telephone companies toprovide 100 to 150 television channels to their customers for the sameprice as cable companies charge for 50. Therefore, cable companies willbe displaced by the new companies within a few years.Which of thefollowing, if true, most helps to strengthen the argument?
(A) The initial cost per household of installing new fiber-optictelevision service will exceed the current cost of installing cabletelevision service.
(B) The most popular movies and programs on channels carried bycable companies will also be offered on channels carried by thefiber-optic lines owned by the telephone companies.
(C) Cable television companies will respond to competition from thetelephone companies by increasing the number of channels they offer.
(D) Some telephone companies own cable companies in areas other than those in which they provide telephone services.
(E) The new fiber-optic services offered by telephone companieswill be subject to more stringent governmental programming regulationsthan those to which cable companies are now subject.

4. The onlyphysical factor preventing a human journey to Mars has been weight.Carrying enough fuel to propel a conventional spacecraft to Mars andback would make even the lightest craft too heavy to be launched fromEarth. A device has recently been invented, however, that allows anotherwise conventional spacecraft to refill the craft's fuel tanks withfuel manufactured from the Martian atmosphere for the return trip.Therefore, it is possible for people to go to Mars in a spacecraft thatcarries this device and then return.
Which one of the following is an assumption on which the argument depends?
(A) The amount of fuel needed for a spacecraft to return from Marsis the same as the amount of fuel needed to travel from Earth to Mars.
(B) The fuel manufactured from the Martian atmosphere would not differ in composition from the fuel used to travel to Mars.
(C) The device for manufacturing fuel from the Martian atmosphere would not take up any of the spaceship crew's living space.
(D) A conventional spacecraft equipped with the device would not beappreciably more expensive to construct than current spacecrafttypically are.
(E) The device for manufacturing fuel for the return to Earthweighs less than the tanks of fuel that a conventional spacecraft wouldotherwise need to carry from Earth for the return trip.