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？ --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 60.251.224.183