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  3. Scientists were embroiled (使卷入) last week in an international row over genetically modified cotton (GM cotton). A study in C

Scientists were embroiled (使卷入) last week in an international row over genetically modified cotton (GM cotton). A study in C

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问题     Scientists were embroiled (使卷入) last week in an international row over genetically modified cotton (GM cotton).
    A study in China suggested for the first time that the crop was permanently damaging the environment and that insects were building up resistance to it.
    The study, by the Nanjing institute of Environmental Science, combined the laboratory and field work from four Chinese scientific institutes. The study was done over a several - year period.
    GM Cotton had a gene resistance to the cotton bollworm (棉铃虫) and isolated from the bacterium (细菌) named Bacillus thuringiensis (Bt), but the study found that it harms the natural parasitic (寄生的) enemies of the cotton bollworm.
    It also indicated that populations of pests besides the bollworm had increased in Bt cotton fields and some had replaced the bollworm as the primary pest.
    However, the leading GM company, the US’s Monsanto, which controls more than 80 per cent of the Bt cotton grown worldwide, dismissed the research.
    It said that the industry has always cited GM cotton as its biggest success, because it can increase yields by up to 60 per cent and reduce the need for pesticides (杀虫剂) by 80 per cent.
    But, unfortunately for the industry, (80) the scientists also found that the resistance of Bt cotton to bollworm decreased significantly over time.
The author imply that ______.
选项 A、The US’s Monsanto agreed with the results of Chinese scientists study
B、GM cotton is an ideal crop
C、The US’s Monsanto dismissed the research for its own profit
D、Cotton bollworm has no resistance to Bt cotton over time
答案C
解析 由第六、七段可知，孟山都公司一向以它的GM棉花为荣，并拥有全球80%的该种棉花种植量。可见，若这种棉花一旦被发现有害，势必会影响这家公司的经济效益，所以它就解散了研究小组。在最后一段中说到，科学家还发现，Bt棉花对棉铃虫的抗性在一段时间后会显著降低。即，在一段时间后，棉铃虫会对Bt棉花产生抗性。所以D是不对的。
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