请教两道逻辑题，谢谢！

andreasyang · 发表于 2010-7-29 12:46:53

Investigators concluded that human failure was not responsible for the fatal airplane crash last August, and since that time new and more stringent rules for identifying and reporting mechanical problems have been in effect. That accounts for the fact that reports of airplane mechanical problems have increased in frequency by 50 percent since last August.
Which one of the following is an assumption underlying the argument in the passage?
(A) Airplane travel is still relatively safe, despite the increase in reported mechanical problems.
(B) Mechanical problems in airplanes have increased dramatically since last August.
(C) Mechanical problems in airplanes have not increased by 50 percent since last August.
(D) Airlines are less reluctant to report mechanical problems than they previously were.
(E) Mechanical problems in airplanes have become easier to detect since last August.

Some good cooks are gourmet cooks who pride themselves on always using extravagantly rich ingredients in elaborate recipes. Some good cooks can be characterized as fast-food cooks. They may use rich ingredients as long as the recipes are easy to follow and take little time. Other good cooks are health food enthusiasts, who are concerned primarily with the nutritional value of food. But even though not all good cooks are big eaters, they all enjoy preparing and serving food.
If the information in the passage is true, which one of the following CANNOT be true?
(A) Most good cooks do not use extravagantly rich ingredients.
(B) Everyone who enjoys preparing and serving food is a good cook.
(C) More good cooks who use extravagantly rich ingredients are big eaters than are good cooks who do not use such ingredients.
(D) There are fewer good cooks who enjoy serving and preparing food than there are good cooks who are big eaters.
(E) Gourmet cooks, fast-food cooks, and cooks who are health food enthusiasts are all big eaters.

andreasyang · 发表于 2010-7-29 13:02:46

第二题明白了，太粗心了，第一题还是不明白

gilgemash · 发表于 2010-7-30 12:15:05

(A) Airplane travel is still relatively safe, despite the increase in reported mechanical problems. - the fact that airplane is still safe is out of scope, it doesn't explain the increased number of reports of mechanical problems

(B) Mechanical problems in airplanes have increased dramatically since last August. - according to the argument, the number of reports has increased dramatically, but not the actual mechanical problems (reports don't mean actual mechanical problems as reports can be false)

(C) Mechanical problems in airplanes have not increased by 50 percent since last August - CORRECT as the conclusion is the reports were increased by 50% which means already existing problems were reported rather than new problems.

(D) Airlines are less reluctant to report mechanical problems than they previously were. - how reluctant are airlines to report mechanical problems is not applicable to our case

(E) Mechanical problems in airplanes have become easier to detect since last August. - the fact that mechanical problems have become easier to detect is out of scope

请教两道逻辑题，谢谢！

所属分类: GMAT考试

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