新东方逻辑题目求助

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一下三个削弱题希望大家指教分析，在此先谢谢了：7.(Z10)Certain genetically modified strains of maizeproduce a natural insecticide that protects against maize-eating insects.  The insecticide occurs throughout the plant,including its pollen.  Maize pollen isdispersed by the wind and often blows onto milkweed plants that grow near maizefields.  Caterpillars of monarchbutterflies feed exclusively on milkweed leaves.  When, in experiments, these caterpillars werefed milkweed leaves dusted with pollen from modified maize plants, theydied.  Therefore, use of the modified maizeinadvertently imperils monarch butterflies.


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

A.   Per unit of volume, the natural insecticideproduced by the genetically modified maize plants is less toxic to insects thanare many commercial insecticides commonly used on maize plants.
B.   Standard weed-control practices that havebeen used by farmers for decades have largely eliminated milkweed plants fromcertain areas where monarch-butterfly caterpillars were once common.
C.   The experiments showed that the caterpillarswere not harmed by contact with the pollen from the genetically modified plantsunless they ingested it.
D.  The maize-eating insects that the naturalinsecticide protects against do not feed on the pollen of the maize plant.
E.   Airborne maize pollen tends to collect on the middle leaves ofmilkweed plants and monarch caterpillars feed only on the plant’s tender upperleaves.





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


Whichof the following, if true, most seriously weakens the argument?

A.   In Barraland the range of punishments thatcan be imposed instead of a prison sentence is wide.
B.   Over the last ten years, overcrowding in theprisons of Barraland has essentially been eliminated as a result of anambitious program of prison construction.
C.   Tenyears ago, Barraland reformed its criminal justice system, imposing longerminimum sentences for those crimes for which a prison sentence had long beenmandatory.
D.  Barraland has been supervising convicts onparole more closely in recent years, with the result that parole violationshave become significantly less frequent.
E.   The number of people in Barraland who feel thatcrime is on the increase is significantly greater now than it was five yearsago.






12.(Z15)A survey of entrepreneurs who started companieslast year shows that while virtually all did substantial preparatory researchand planning, only half used that work to produce a formal business plan.  Since, on average, the entrepreneurs withoutformal plans secured the capital they needed in half the time of those withplans, these survey results indicate that, in general, formal plans did nothelp the entrepreneurs who produced them to secure the capital they needed.


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

A.   Companies started by entrepreneurs who hadused formal business plans to attract investment were on the whole asprofitable in their first year as were companies started by entrepreneurs whohad not produced such plans.
B.   In surveys of entrepreneurs who haveattempted without success to raise sufficient capital, more than half of therespondents indicate that they have produced a formal business plan.
C.   Among the entrepreneurs surveyed, those whodid not produce formal business plans sought and received a much largerproportion of their capital from investors with whom they had a long-standingbusiness relationship.
D.  The entrepreneurs surveyed who did not producea formal business plan spent nearly as much time doing preparatory research andplanning as the entrepreneurs who produced plans.
E.   The entrepreneurs who producedbusiness plans generally reported later that the process of writing the planhad increased their confidence that their company would succeed.