新prep cr1 102求解

hjbb1027

102.


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.

答案是E，但是D为什么不可以呢，一样有加强啊，哪位大侠解释一下，谢谢啦

emmahsu

题目是将新品种与种植之间建立了一种关系，认为新品种形成A，所以能成功，支持的话就要将这个必然性建立起来。
D的话只说它营养高，只是在肯定前提，但没有与结论建立联系。
E就强调新品种并不比原有品种缺某种元素，也就是说不会因为种植新品种，导致负面的结果，但同时新品种又能形成A，相对普通品种有优势，所以能成功。

zjhzkingsam

文章主逻辑线是:论据-SP富含当地人没有的一种VA, 结论-推广SP会成功.

D在说,没有其他的potatoes会比SP更富含VA.这是一个无关选项,因为,它扩大了文章的讨论范围. 一般选项中有other等扩大范围的词语,除非题干中间有any等绝对的话语,基本都是错的.你可以用这个排除选项,在新东方老师成为other的词组为大金刚.

E,说SP没有缺少什么重要的成分现有POTATO有的,意识就是SP比起当地的POTATO没什么其他不好的.既然,又没有不好,又富有VA(差点打成AV了),不是屌爆了嘛~