GWD两道逻辑题，求牛人帮助，很急！！谢谢

iamdurant

Which of the following most logically completes the passage?
       A certain tropical island received food donations in the form of powdered milk for distribution to its poorest residents, who were thought to be malnourished. Subsequently, the rate of liver cancers among those islanders increased sharply. The donated milk was probably to blame: recent laboratory research on rats has shown that rats briefly exposed to the substances aflatoxin tend to develop liver cancer when fed casein, a milk protein. This reslut is relevant because___
        A. in the tropics, peanut, a staple of these island residents, support a mold growth that produces aflatoxin.
        B. the liver is more sensitive to carcinogens, of which aflatoxin may be one, than most other bodily organs.
        C. casein is not the only protein contained in milk.
        D. powdered milk is the most appropriate from in which to send milk to a tropical destination.
        E. the people who were given the donated milk had been screened for their ability to digest milk.

          答案是A,小弟不理解，研究证明aflatoxin是导致liver cancer的原因，又说了牛奶 was to blame,那么就应该说明牛奶和aflatoxin的关系。A选项提到了另一个当地居民的主食——peanuts,这有什么关系呢？


       Insece infestations in certain cotton-growing regions of the world have caused dreamatic increases in the price of cotton on the world market. By contrast, the price of soybeans has long remained stable. Knowing that contton plants mature quickly, many soybean growers in Ortovia plan to cease growing soybeans and begin raising cotton instead, thereby taking advantage of the high price of cotton to increase their income significantly, at least over the next several years.

          Which of the following, if true, most seriously weakens the plan's chances for success?
 答案：  
B: Tests of a newly developed, inexpensive pesticide have shown it to be both environmentally safe and effective against the insects that have infested cotton crops.
         收入的提升跟使用pesticide有什么关系呢？请高手指点？
         非常感谢！！！

狂威雪

现象肝癌的比率上升，原因是捐献的牛奶。解释原因，最近的研究发现老鼠expose to the aflatoxin 并且喂食奶蛋白 就有得肝癌的趋势。
aflatoxin是结论中的新元素在前文没有提到。所以答案中要体现aflatoxin与结论的关系。
因为当地人食用能产生alatoxin的花生之类的东西，再加上奶所以就得肝癌，正好与实验结论保持一致。

狂威雪

第二题，因为有便宜的杀虫剂可以用，所以棉花的产量将提升，价格就会下降。所以改种棉花不能明显提高收入~~削弱结论

monoecy

我覺得A 選項是削弱, 當然啦, 削弱也算relevant