Agents a biocontrol agent should be used only in

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agents? A. Biocontrol agent should be used only in cases where chemical pesticides have proven ineffective or overly dangerous. B. Extinctions and disruptions resulting from the use of biocontrol agents are likely to have increasingly severe commercial consequences. C. The use of biocontrol agents does not require regulation as stringent as that required by the use of chemical pesticides. D. The use of biocontrol agents may even- finally supersede the use of chemical pesticides in controlling unwanted species. E. The risks of using native biocontrol agents may be easier to predict than the risks of using nonnative biocontrol agents. Answer: ------------------------------------------------------------------------------------------------------- 5 Which of the following is mentioned in the passage as an indirect effect of using a biocontrol agent? ------------------------------------------------------------------------------------------------------- 6 The example presented by the author in lines 14-23 most clearly serves to illustrate A. a situation in which a species is less vulnerable to biocontrol agents than it would have been to chemical pesticides. B. a way in which the introduction of a bio- control agent can affect a nontarget
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species. C. a nonnative agent’s adapting in an unpre- dictable way that results in damage to a new host. D. The contention that biocontrol agents can harm nontarget species by competing with them for resources E. the way in which indirect consequences from the use of biocontrol agents are most likely to occurs. ------------------------------------------------------------------------------------------------------- 7 Which of the following most logically completes the argument below? The expansion of large-scale farming in Africa and Asia has destroyed much of the natural vegetation on which elephants have historically depended, forcing them to turn to cultivated land to satisfy their enormous appetites. As a result, farmers have lost millions of dollars worth of crops annually. Yet even if elephant sanctuaries were created on a widespread basis to guarantee elephants sufficient natural vegetation, the raiding would likely persist, since ------------------------------------------------------------------------------------------------------- 8 The results of the company’s cost- cutting measures are evident in its profits, which increased five percent during the first three months of this year after it fell over the last two years. A. which increased five percent during the first three months of this year after it fell B. which had increased five percent during the first three months of this year after it had fallen C. which have increased five percent during the first three months of this year after falling D. with a five percent increase during the first three months of this year after falling E. with a five percent increase during the first three months of this year after having fallen
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--------------------------------------------------------------------------------------------------- 9 Part of the proposed increase in state education spending is due to higher enrollment, since the number of students in public schools have grown steadily since the mid- 1980’s and, at nearly 47 million, are at a record high. A. enrollment, since the number of students in public schools have grown steadily since the mid-1980’s and, at nearly 47 million, are at. B. Enrollment, with a number of students in public schools growing steadily since the mid-1980’s and, at nearly 47 million, reaching. C. Enrollment: since students in public schools have grown steadily in number since the mid-1980’s and, at nearly 47 million, have reached. D. Enrollment: the number of students in public schools has grown steadily since the mid-1980’s and, at nearly 47 million, has reached. E. Enrollment: students in public schools have grown steadily in number since the mid-1980’s and , at nearly 47million, are at
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