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Reviewer: The author of a recent book argues that lead contributed to many public health problems in the late nineteenth and early twentieth centuries. He claims that the main sources of this pollutant were urban water-delivery systems, which used lead pipes that leached lead into the water supply. But my own research on municipalities that used lead pipes during the period in question has shown that the inhabitants of several of them did not exhibit symptoms of lead poisoning, so the pipes are most likely not the primary culprit. Which of the following would, if true, most weaken the reviewer's reasoning? (A) In certain areas, exposure to hard water--water with a high mineral content--promotes the formation of a protective coating on the interior of lead pipes. (B) In the late nineteenth and early twentieth centuries, many household fixtures and consumer products contained lead. (C) Lead was introduced into gasoline in the 1920s, during which time lead-poisoning symptoms increased in many locales. (D) Several cities that used lead pipes exhibited unusual rates of convulsive disorders and other conditions associated with lead exposure. (E) The author in question notes that other factors, including inadequate sewer systems and urban crowding; caused widespread outbreaks of infectious diseases.
The more viewers a television show attracts, the greater the advertising revenue the show generates. The television network Vidnet’s most popular show, Starlight, currently earns the network’s highest profit, but next year, because of unavoidable increases in production costs, its profits are projected to fall to below the average for Vidnet shows. Therefore, Vidnet would earn greater profits overall if replaced Starlight with a show of average popularity and production costs. Which of the following, if true, most seriously weakens the argument? A The average profit of Vidnet shows have increased in each of the last three years. B Shows that occupy time slots immediately before and after very popular shows tend to have far more viewers than they otherwise would. C Starlight currently has the highest production costs of all Vidnet shows. D Last year Vidnet lost money on a weekly show that was substantially similar to Starlight And was broadcast on a different day from Starlight. E Even if, as a result of increased production costs, Starlight becomes less profitable than the average for Vidnet shows, it will still be more profitable than the average for television shows of all networks combined.
参考答案：AB
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发表于 2021-10-25 19:43:49
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