【GMAT考满分逻辑CR题库】Genetically modified crops have been sold comme_真题_答案

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Genetically modified crops have been sold commercially for almost twenty years now, and there is no evidence linking their consumption with any sort of disease. At this point, it is unreasonable to believe they are dangerous; with such attention on them, if they created short- or long-term health problems, we would know about it by now.

Which of the following, if true, most weakens the argument stated above?

A
There are various ways of producing genetically modified crops, and we are likely develop a new method in the near future which poses new health risks.
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B
The improved attributes of genetically modified crops have primarily benefitted not the world's hungry, but rather farmers and the owners of corporations.
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C
Although we have studied the potential health impact of eating GMOs on humans, we have not studied potential disruptions to the ecosystem which would threaten human safety indirectly.
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D
If companies that produce genetically modified crops discovered a human health hazard of those crops, the companies would have an incentive to downplay or even conceal their findings.
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E
Places where the winters are cold rarely have a problem of water shortage.
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正确答案: C

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