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题目材料：
Since coffee beans from Goruna Island are among the world's costliest, most coffee blends labeled “Goruna Blend” contain only 25 percent Goruna coffee. In many such blends, the distinctive Goruna flavor is virtually undetectable. Consequently, the reputation of Goruna coffee has declined. Unfortunately, new labeling restrictions by Goruna's growers' cooperative are unlikely to reverse this decline，since they continue to allow coffee roasters to use the words “Goruna Blend” for blends containing only 25 percent Goruna beans.
Which of the following, if true, most seriously weakens the argument?
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A.Until recently, the demand from customers for Goruna blends had been rising steadily for several decades.
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B.By tightening inspection procedures, the labeling restrictions will cause a slight increase in the price that retailers pay for Goruna coffee beans.
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C.The labeling restrictions were endorsed by blenders of Goruna coffee beans.
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D.The labeling restrictions will halt the use in Goruna blends of those varieties of coffee beans that can mask the distinctive flavor of Goruna beans.
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E.The vast majority of people who purchase Goruna blends have never tasted coffee made with 100 percent Goruna beans.
D显示答案
