标题: PREP1- 102 [打印本页] 作者: 端木瑶 时间: 2011-8-6 17:37 标题: PREP1- 102 In partsof South America,vitamin-A deficiency is a serious health problem, especially among children[l1] . In one region, agriculturists hope to improvenutrition by encouraging farmers to plant a new variety of sweet potato calledSPK004 that is rich in betacarotene, which the body converts into vitamin A[l2] . The plan has good chances of success, since sweet potato is a staple of the region’s diet andagriculture, and the varieties currently grown contain little beta-carotene.[l3] Whichof the following, if true, most strongly supports the prediction that the planwill succeed? A.There are other vegetables currently grown in the region that contain morebeta-carotene than the currently cultivated varieties of sweet potato do. 这个是削弱吧~ B.The flesh of SPK004 differs from that of the currently cultivated sweetpotatoes in color and texture, so traditional foods would look somewhatdifferent when prepared from SPK004. 没谈到果肉啥的 只说作用 C.For successful cultivation of SPK004, a soil significantly richer in nitrogenis needed than is needed for the varieties of sweet potato currently cultivatedin the region. 土地也没谈到 D.There are no other varieties of sweet potato that are significantly richer inbeta-carotene than SPK004 is. E. The currently cultivated varieties of sweetpotato contain no important nutrients that SPK004 lacks. 现在培养的甜土豆种类没有包涵SPK所缺少的重要营养 也就是说现在的土豆里面没有SPK缺乏的东西 那就是说SPK缺的它没有 SPK有的它也没什么~暗示新的品种比旧的营养价值要高咯~
我翻看了以前的讨论 对D还是有疑问，D 选项难道不是对 the varieties currently grown contain little beta-carotene.的复述吗 难道不是给出的原因吗？ 求解答~谢谢~ 作者: bitieming 时间: 2011-8-6 17:56
D选项无法构成支持，有可能存在significantly richer inbeta-carotene SPK004 is的种类，不意味着这个种类就比SPK004更适合在南美洲种植，而且该选项暗示“该计划的成功取决于是否能选到richest in beta-carotene的植物”，而解决胡萝卜素缺乏显然不能仅仅考虑是否是richest的植物，一个仅仅是高含量（不是最高）但适合当地种植条件，人民饮食习惯的植物才是最优选择。