Gmat考试逻辑试题90题(2)

文章作者 100test 发表时间 2007:05:07 16:04:40
来源 100Test.Com百考试题网

18. Modern navigation systems, which are found in most of todays commercial aircraft, are made with low-power circuitry, which is more susceptible to interference than the vacuum-tube circuitry found in older planes. During landing, navigation systems receive radio signals from the airport to guide the plane to the runway. Recently, one plane with low-power circuitry veered off course during landing, its dials dimming, when a passenger turned on a laptop computer. Clearly, modern aircraft navigation systems are being put at risk by the electronic devices that passengers carry on board, such as cassette players and laptop computers.

Which one of the following, if true, LEAST strengthens the argument above?

(A) After the laptop computer was turned off, the plane regained course and its navigation instruments and dials returned to normal.

(B) When in use all electronic devices emit electromagnetic radiation, which is known to interfere with circuitry.

(C) No problems with navigational equipment or instrument dials have been reported on flights with no passenger-owned electronic devices on board.

(D) Significant electromagnetic radiation from portable electronic devices can travel up to eight meters, and some passenger seats on modern aircraft are located within four meters of the navigation systems.

(E) Planes were first equipped with low-power circuitry at about the same time portable electronic devices became popular.

Jane: Television programs and movies that depict violence among teenagers are extremely popular. Given how influential these media are, we have good reason to believe that these depictions cause young people to engage in violent behavior. Hence, depictions of violence among teenagers should be prohibited from movies and television programs, if only in those programs and movies promoted to young audiences.

Maurice: But you are recommending nothing short of censorship! Besides which, your claim that television and movie depictions of violence cause violence is mistaken: violence among young people predates movies and television by centuries.

19. Which one of the following, if true, most strengthens Janes argument?

(A) The most violent characters depicted in movies and on television programs are adult characters who are portrayed by adult actors.

(B) The movies that have been shown to have the most influence on young peoples behavior are those that are promoted to young audiences.

(C) The people who make the most profits in the movie and television industry are those who can successfully promote their work to both young and old audiences.

(D) Many adolescents who engage in violent behavior had already displayed such behavior before they were exposed violence in movies.

(E) Among the producers who make both movies and television programs, many voluntarily restrict the subject matter of films directed toward young audiences.

20. A rise in the percentage of all 18-year-olds who were recruited by the armed services of a small republic between 1980 and 1986 correlates with a rise in the percentage of young people who 0dropped out of high school in that republic. Since 18-year-olds in the republic are generally either high school graduates or high school 0dropouts, the correlation leads to the conclusion that the republics recruitment rates for 18-year-olds depend substantially on recruitment rates for high school 0dropouts.

Which one of the following statements, if true, most weakens the argument?

(A) A large number of 18-year-old high school graduates were recruited for the republics armed services in 1986 than in 1980.

(B) Many of the high-technology systems used by the republics armed services can be operated only by individuals who have completed a high school education.

(C) Between 1980 and 1986 the percentage of high school graduates among 18-year-olds recruited in the republic rose sharply.

(D) Personnel of the republics armed services are strongly encouraged to finish their high school education.

(E) The proportion of recruits who had completed at least two years of college education was greater in 1986 than in 1980.