[求助]LSAT-4-3-15

andysonic

LSAT 4-3-15

The Scorpio Miser with its special high-efficiency engine costs more to buy than the standard Scorpio sports car. At current fuel prices, a buyer choosing the Miser would have to drive it 60,000 miles to make up the difference in purchase price through savings on fuel. It follows that, if fuel prices fell, it would take fewer miles to reach the break-even point.

Which one of the following arguments contains an error of reasoning similar to that in the argument above?d

(A) The true annual rate of earnings on an interest-bearing account is the annual rate of interest less the annual rate of inflation. Consequently, if the rate of inflation drips, the rate of interest can be reduced by an equal amount without there being a change in the true rate of earnings.

(B) For retail food stores, the Polar freezer, unlike the Arctic freezer, provides a consistent temperature that allows the store to carry premium frozen foods. Thus, if electricity rates fell, a lower volume of premium-food sales could justify choosing the Polar freezer.

(C) With the Roadmaker, a crew can repave a mile of decayed road in less time than with the competing model, which is, however, much less expensive. Reduced staffing levels made possible by the Roadmaker eventually compensate for its higher price. Therefore, the Roadmaker is especially advantageous where average wages are low.

(D) The improve strain the Northland apple tree bears fruit younger and lives longer than the standard strain. The standard strain does grow larger at maturity, but to allow for this, standard trees must be spaced farther apart. Therefore, new plantings should all be of the improved strain.（C）

(E) Stocks pay dividends, which vary from year to year depending on profits made. Bonds pay interest, which remains constant from year to year. Therefore, since the interest earned on bonds does not decrease when economic conditions decline, investors interested in a reliable income should choose bonds.

想請問各位大牛:

1.題目的錯誤是在說"fuel 的price要rise才可take fewer miles to break-even point嗎"?還是別種錯誤呢?

2.答案c是為什麼？

ecsniffer

我觉得原文的错误在于if fuel prices fell, it would take fewer miles to reach the break-even point.事实上应该是more miles


C中错在Therefore, the Roadmaker is especially advantageous where average wages are low.事实上应该是average wages are high.


感觉上他们犯了同一类逻辑错误。


不过谁能指点一下，这里的共同逻辑错误是什么？

cranberry

题目中两种机器的差价应该认为是一个定值 每公里节省的油量也应该是一定的，那么如果油价降低，则需要更多的油量来达到差价，所以题目搞反。


呵呵，我想你找到了共同的错误，都是结论相反

ecsniffer

以下是引用cranberry在2004-2-21 15:27:00的发言：




呵呵，我想你找到了共同的错误，都是结论相反

weiyu

I agree.