其实我觉得这题只要看整篇reading最後一段就好，前面可以全部skip： 因为 (1) sweet potato is a staple of the region's diet and agriculture (2) varieties currently grown contain little beta-carotene 所以作者conclude "this plan has good chances of success" 现在问题问以下那个选项最能支持plan will succeed 所以应该要找一个可以支持或加强1 or 2论点的选项 E很明显就是第二点的衍生， 目前种植的品种不但只有一点点beta-carotene 想推行的新品种SPK004更含有所有旧品种的养分 所以support推行SPK004论点 D不一定适合，毕竟最好不一定最适 (如果SPK beta含量高但缺少镁锌铜锰但岂不是亏大了 O_O!!) 而且和最後作者用来conclude适用SPK004的两大因素没有直接关连 ※ 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？ --

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