Gortland has long been narrowly self-sufficient inboth grain and meat. However, as per capita income in Gortland has risen towardthe world average, per capita consumption of meat has also risen toward theworld average, and it takes several pounds of grain to produce one pound ofmeat. Therefore, since per capita incomecontinues to rise, whereas domestic grain production will not increase,Gortland will soon have to import either grain or meat or both.
Which of the following is an assumption on whichthe argument depends?
(A) The total acreage devoted to grain productionin Gortland will soon decrease.
(B) Importing either grain or meat will not resultin a significantly higher percentage of Gortlanders' incomes being spent onfood than is currently the case.
(C) The per capita consumption of meat in Gortlandis increasing at roughly the same rate across all income levels.
(D) The per capita income of meat producers inGortland is rising faster than the per capita income of grain producers.
(E) People in Gortland who increase theirconsumption of meat will not radically decrease their consumption of grain.
答案选E，但是我选了B。我觉得看了论坛上下载的解释，还是看不懂啊！
PREP20: For years the beautiful Renaissance buildings inPalitito have been damaged by exhaust from the many tour buses that come to thecity. There has been little parkingspace, so most buses have idled at the curb during each stop on their tour, andidling produces as much exhaust as driving. The city has now provided parking that accommodates a third of the tourbuses, so damage to Palitito's buildings from the buses' exhaust will diminishsignificantly.
Which of the following, if true, most stronglysupports the argument?
(A) The exhaust from Palitito's few automobiles isnot a significant threat to Palitito's buildings.
(B) Palitito's Renaissance buildings are notthreatened by pollution other than engine exhaust.
(C) Tour buses typically spend less thanone-quarter of the time they are in Palitito transporting passengers from onesite to another.
(D) More tourists come to Palitito by tour busthan by any other single means of transportation.
(E) Some of the tour buses that are unable to findparking drive around Palitito while their passengers are visiting a site.
答案是C，我选的是B。看了解释还是不能领悟！求高人相助！ | 
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发表于 2011-12-20 10:48:28
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