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PREP2-42 42.Researchers have found that when very overweight people， who tend to have relatively low metabolic rates， lose weight primarily through dieting， their metabolisms generally remain unchanged. They will thus burn significantly fewer calories at the new weight than do people whose weight is normally at that level. Such newly thin persons will， therefore， ultimately regain weight until their body size again matches their metabolic rate. The conclusion of the argument above depends on which of the following assumptions？ （A） Relatively few very overweight people who have dieted down to a new weight tend to continue to consume substantially fewer calories than do people whose normal weight is at that level. （B） The metabolisms of people who are usually not overweight are much more able to vary than the metabolisms of people who have been very overweight. （C） The amount of calories that a person usually burns in a day is determined more by the amount that is consumed that day than by the current weight of the individual. （D） Researchers have not yet determined whether the metabolic rates of formerly very overweight individuals can be accelerated by means of chemical agents. （E） Because of the constancy of their metabolic rates， people who are at their usual weight normally have as much difficulty gaining weight as they do losing it. 这题目我看懂了，可是就是不明白答案为什么选A？我觉得文中的第二句话，和A的意思正好相反，A怎么回事假设条件呢？ PREP2-55 55.The cotton farms of Country Q became so productive that the market could not aborb all that they produced. Consequently,cotton prices fell. The government tried to boost cotton prices by offering farmers who took 25 percent of their cotton acreage out of production direct support payments up to a specified maximum per farm. The government's program,if successful, will not be a net burden on the budget. Which of the following, if true, is the best basis for an explanation of how this could be so? (A) Depressed cotton prices meant operating losses for cotton farms,and the government lost revenue from taxes on farm profits. (B) Cotton production in several countries other than Q declined slightly the year that the support-payment program went into effect in Q. (C) The first year that the cupport-paymnet program was in effect,cotton acreage in Q was 5% below its level in the base year for the program. (D) The specified maximum per farm meant that for very large cotton farms the support payments were less per acre for those acres that were withdrawn from production than they were for smaller farms. (E) Farmers who wished to qualify for support payments could not use the cotton acreage that was withdrawn from production to grow any other crop. 这题选A，我是一点不明白，麻烦谁给我讲解的时候帮我翻译一下我画了黑体的那句行嘛？实在看不懂.... | 
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发表于 2008-7-24 20:31:00
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