※ 引述《tremendous (keepgoing)》之铭言： : In parts of South America, vitamin-A deficiency is a serious health problem, : especially among children. In one region, agriculturists hope to improve : nutrition by encouraging farmers to plant a new variety of sweet potato : called SPK004 that is rich in betacarotene, which the body converts into : vitamin A. The plan has good chances of success, since sweet potato is a : staple of the region's diet and agriculture, and the varieties currently : grown contain little beta-carotene. : Which of the following, if true, most strongly supports the prediction that : the plan will succeed? : A. There are other vegetables currently grown in the region that contain more : beta-carotene than the currently cultivated varieties of sweet potato do. : B. The flesh of SPK004 differs from that of the currently cultivated sweet : potatoes in color and texture, so traditional foods would look somewhat : different when prepared from SPK004. : C. For successful cultivation of SPK004, a soil significantly richer in : nitrogen is needed than is needed for the varieties of sweet potato currently : cultivated in the region. : D. There are no other varieties of sweet potato that are significantly richer : in beta-carotene than SPK004 is. : E. The currently cultivated varieties of sweet potato contain no important : nutrients that SPK004 lacks. : 答案E : 大意是为改善南美某地区的维生素a不足，所以要种植可以转换成维生素a的甜芋 spk004 : 提供给当地民众，而刚好民众的主食及农作物是甜芋，因此这个计划可以成功 : 这题是GWD1-Q15的变形题 : 我选D，认为没有其他品种的甜芋有更高的beta-carotene 因此种植SPK004当然会成功会 : 达成转换维生素a给民众的任务，是个很好support啊 : 而答案E我以为是无关选项，想不通现在种植的甜芋品种和种植SPK004的连结点，这选项为什 : 麽可以支持呢？ 答案E，现在的作物没有含有任何SPK004缺少的营养。 光看字面实在很难发现什麽， 但取非， 现在的作物含有重要的营养是SPK004缺少的， 这样一来改种SPK004变成顾此失彼，可以weaken。 所以E是assumption的题型概念。 答案D我也觉得可以support，可是要选most的话，E是比较适合。 有请其他强者指导一下D选项应该怎麽排除呢? 重述前提?? --

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