GMAT逻辑加强题例题五

　　备考GMAT逻辑的过程中，对于各部分的题型要有充分的了解，这样才能够在考试中能够更好地拿到分数。下面新东方在线GMAT频道为大家整理了一些相关的例题，供大家练习。

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　　17.(Z)The Eurasian ruffe, a fish species inadvertently introduced into North America’s Great Lakes in recent years, feeds on the eggs of lake whitefish, a native species, thus threatening the lakes’ natural ecosystem. To help track the ruffe’s spread, government agencies have produced wallet-sized cards about the ruffe. The cards contain pictures of the ruffe and explain the danger they pose; the cards also request anglers to report any ruffe they catch.

　　Which of the following, if true, would provide most support for the prediction that the agencies’ action will have its intended effect?

　　A. The ruffe has spiny fins that make it unattractive as prey.

　　B. Ruffe generally feed at night, but most recreational fishing on the Great Lakes is done during daytime hours.

　　C. Most people who fish recreationally on the Great Lakes are interested in the preservation of the lake whitefish because it is a highly prized game fish.

　　D. The ruffe is one of several nonnative species in the Great Lakes whose existence threatens the survival of lake whitefish populations there.

　　E. The bait that most people use when fishing for whitefish on the Great Lakes is not attractive to ruffe.

　　18.(Z)The traditional treatment of strep infections has been a seven-day course of antibiotics, either penicillin or erythromycin. However, since many patients stop taking those drugs within three days, reinfection is common in cases where these drugs are prescribed. A new antibiotic requires only a three-day course of treatment. Therefore, reinfection will probably be less common in cases where the new antibiotic is prescribed than in cases where either penicillin or erythromycin is prescribed.

　　Which of the following, if true, most strengthens the argument?

　　Tricky!!

　　A. Some of people who are allergic to penicillin are likely to be allergic to the new antibiotic.

　　B. A course of treatment with the new antibiotic costs about the same as a course of treatment with either penicillin or erythromycin.

　　C. The new antibiotic has been shown to be effective in eradicating bacterial infections other than strep.

　　D. Some physicians have already begun to prescribe the new antibiotic instead of penicillin or erythromycin for the treatment of some strep infections

　　E. Regardless of whether they take a traditional antibiotic or the new one, most patients feel fully recovered after taking the drug for three days.

　　19.(Z)In response to viral infection, the immune systems of mice typically produce antibodies that destroy the virus by binding to proteins on its surface. Mice infected with a herpesvirus generally develop keratitis, a degenerative disease affecting part of the eye. Since proteins on the surface of cells in this part of the eye closely resemble those on the herpesvirus surface, scientists hypothesize that these cases of keratitis are caused by antibodies to herpesvirus.

　　Which of the following, if true, gives the greatest additional support to the scientists’ hypothesis?

　　A. Other types of virus have surface proteins that closely resemble proteins found in various organs of mice.

　　B. There are mice that are unable to form antibodies in response to herpes infections, and these mice contract herpes at roughly the same rate as other mice.

　　C. Mice that are infected with a herpesvirus but do not develop keratitis produce as many antibodies as infected mice that do develop keratitis.

　　D. There are mice that are unable to form antibodies in response to herpes infections, and these mice survive these infections without ever developing keratitis.

　　E. Mice that have never been infected with a herpesvirus can sometimes develop keratitis.

　　20.(Z) Lyme disease is caused by a bacterium transmitted to humans by deer ticks. Generally deer ticks pick up the bacterium while in the larval stage from feeding on infected white-footed mice. However, certain other species on which the larvae feed do not harbor the bacterium. Therefore, if the population of these other species were increased, the number of ticks acquiring the bacterium and hence the number of people contracting Lyme disease would likely decline.

　　Which of the following, if true, most strengthens the argument?

　　A. Ticks do not suffer any adverse consequences from carrying the bacterium that causes Lyme disease in humans.

　　B. There are no known cases of a human’s contracting Lyme disease through contact with white-footed mice.

　　C. A deer tick feeds only once while in the larval stage.

　　D. A single host animal can be the source of bacterium for many tick larvae.

　　E. None of the other species on which deer tick larvae feed harbor other bacteria that ticks transmit to humans

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