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GMAT逻辑削弱题在线练习二

2018-05-07 17:08:00来源：网络

　　9.(Z14)Eurasian watermilfoil, a weed not native to Frida Lake, has reproduced prolifically since being accidentally introduced there. In order to eliminate the weed, biologists proposed treating infested parts of the lake with a certain herbicide that is nontoxic for humans and aquatic animals. However, the herbicide might damage populations of certain rare plant species that the lake contains. For this reason local officials rejected the proposal.

　　Which of the following, if true, points out the most serious weakness in the officials’ grounds for rejecting the biologists’ proposal?

　　A. The continuing spread of Eurasian watermilfoil in Frida Lake threatens to choke out the lake’s rare plant species.

　　B. Because of ecological conditions prevailing in its native habitat, Eurasian watermilfoil is not as dominant there as it is in Frida Lake.

　　C. The proliferation of Eurasian watermilfoil in Frida Lake has led to reductions in the populations of some species of aquatic animals.

　　D. Although Eurasian watermilfoil could be mechanically removed from Frida Lake, eliminating the weed would take far longer this way than it would using herbicides.

　　E. Unless Eurasian watermilfoil is completely eliminated from Frida Lake, it will quickly spread again once herbicide treatments or other control measures cease.

　　10.(Z14)In each of the past five years, Barraland’s prison population has increased. Yet, according to official government statistics, for none of those years has there been either an increase in the number of criminal cases brought to trial, or an increase in the rate at which convictions have been obtained. Clearly, therefore, the percentage of people convicted of crimes who are being given prison sentences is on the increase.

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

　　A. In Barraland the range of punishments that can be imposed instead of a prison sentence is wide.

　　B. Over the last ten years, overcrowding in the prisons of Barraland has essentially been eliminated as a result of an ambitious program of prison construction.

　　C. Ten years ago, Barraland reformed its criminal justice system, imposing longer minimum sentences for those crimes for which a prison sentence had long been mandatory.

　　D. Barraland has been supervising convicts on parole more closely in recent years, with the result that parole violations have become significantly less frequent.

　　E. The number of people in Barraland who feel that crime is on the increase is significantly greater now than it was five years ago.

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