逻辑思路不懂! 求解释! 谢谢! GMAT CRITICAL REASONING OLD QUESTIONS REVIEW 20.Which of the following best completes the passage below? The unemployment rate in the US fell from 7.5% in 1981 to 6.9% in 1986. It cannot, however, be properly concluded from these statistics that the number of unemployed in 1986 was lower than it had been in 1981 because ___________. (A)help-wanted advertisements increased between 1981 & 1986. (B)many of the high-paying industrial jobs available in 1981 were replaced by low-wage service jobs in 1986, resulting in displacements of hundreds of thousands of workers. (C)in some midwestern industrial states, the unemployment rate was much higher in 1986 than it had been in 1981. (D)the total available work force, including those with and without employment, increased between 1981 & 1986. (E)the average time that employees stay in any one job dropped during the period 1981 to 1986. A): D [F.32, Q.7] An annually conducted, nationwide survey shows a continuing marked decline in the use of illegal drugs by high school seniors over the last 3 years. 21.Which of the following, if true, casts most doubt on the relevance of the survey results described above for drawing conclusions about illegal drug use in the teen-age population as a whole? (A)Because of cuts in funding, no survey of illegal drug use by high school seniors will be conducted next year. (B)The decline uncovered in the survey has occurred despite the decreasing cost of illegal drugs. (C)Illegal drug use by teen-agers is highest in those areas of the country where teen-agers are least likely to stay in high school for their senior year. (D)Survey participants are more likely now than they were 3 years ago to describe as “heroic” people who were addicted to illegal drugs and have been able to quit. (E)The proportion of high school seniors who say that they strongly disapprove of illegal drug use has declined over the last 3 years. A): C [F.32, Q.10] 22.Which of the following, if true, would provide most support for concluding from the survey results described above that the sue of illegal drugs by people below the age of 20 is declining. (A)Changes in the level of drug use by high school seniors are seldom matched by changes in the level of drug use by other people below the age of 20. (B)In the past, high school seniors were consistently the population group most likely to use illegal drugs and most likely to use them heavily. (C)The percentage of high school seniors who use illegal drugs is consistently very similar to the percentage of all people below the age of 20. (D)The decline revealed by the surveys is the result of drug education programs specifically targeted at those below the age of 20. (E)The number of those surveyed who admit to having sold illegal drugs has declined even faster than has the number who have used drugs. A): C WHY NOT B? [F.32, Q.11] 23. George Bernard Shaw wrote: “That any sane nation, having observed that you could provide for the supply of bread by giving bakers a pecuniary interest in baking for you, should go on to give a surgeon a pecuniary interest in cutting off your leg is enough to make one despair of political humanity.” Shaw’s statement would best serve as an illustration in an argument criticizing which of the following? (A)Dentists who perform unnecessary dental work in order to earn a profit. (B)Doctors who increase their profits by specializing only in diseases that affect a large percentage of the population. (C)Grocers who raise the price of food in order to increase their profit margins. (D)Oil companies that decrease the price of their oil in order to increase their market share. (E)Bakers and surgeons who earn a profit by supplying other people’s basic needs. A): A [F.32, Q.16]fficeffice" />
[em07]
|