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verbal.24-1 - Verbal 1 Tom Bradley was mayor of Los Angeles...

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Verbal 1 Tom Bradley was mayor of Los Angeles from 1973 to 1993, an era when the city had transformed from a collection of suburban neighborhoods to the second-largest city in the United States. A. an era when the city had transformed. B. An era during which the city was transformed. C. An era that transformed it. D. During which era the city transformed. E. During which the city was transformed. Answer: ------------------------------------------------------------------------------------------------------- 2 According to public health officials, in 1998 Massachusetts became the first state in which more babies were born to women over the age of thirty than under it. A. than B. than born C. than they were D. than there had been E. than had been born. Answer: ------------------------------------------------------------------------------------------------------- Q3 TO 6 More selective than most chemical pesticides in that they ordinarily destroy only unwanted species, biocontrol. Line agents (such as insects, fungi, and (5) viruses) eat, infect, or parasitize tar- geted plant or animal pests. However, biocontrol agents can negatively affect nontarget species by, for example, competing with them for resources: a (10) biocontrol agent might reduce the bene- fits conferred by a desirable animal species by consuming a plant on which the animal prefers to lay its eggs. Another example of indirect negative. (15) consequcnces occurred in England when a virus introduced to control rabbits reduced the amount of open ground (because large rabbit popu- lations reduce the ground cover), in
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(20) turn reducing underground ant nests and triggering the extinction of a blue butterfly that had depended on the nests to shelter its offspring. The paucity of known extinctions or disrup- (25) tions resulting from indirect interactions may reflect not the infrequency of such mishaps but rather the failure to look for or to detect them: most organisms likely to be adversely affected by (30) indirect interactions are of little or no known commercial value and the events linking a biocontrol agent with an adverse effect are often unclear. Moreover, determining the potential (35) risks of biocontrol agents before they are used is difficult, especially when a nonnative agent is introduced, because, unlike a chemical pesticide, a biocontrol agent may adapt in unpredictable ways. (40) so that it can feed on or otherwise harm new hosts. ---------------------------------------------------------------- 3 The passage is primarily concerned with A. explaining why until recently scientists failed to recognize the risks presented by biocontrol agents. B. emphasizing that biocontrol agents and chemical pesticides have more similar- ties than differences. C. suggesting that only certain biocontrol agents should be used to control plant or animal pasts. D. arguing that biocontrol agents involve risks, some of which may not be readily discerned. E. suggesting that mishaps involving biocon- troll agents are relatively commonplace. Answer: ---------------------------------------------------------------------------------------------- 4 The passage suggests that the author would be most likely to agree with which of the
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following statements about the use of biocontrol
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