prep 08 CR 102 纠结D和E啊！！

EMMALIULIU

102. (29392-!-item-!-188;#058&004074)     (GWD 1-Q15)

In partsof South America, vitamin-A deficiency is a serious health problem, especiallyamong children.  In one region,agriculturists hope to improve nutrition by encouraging farmers to plant a newvariety of sweet potato called SPK004 that is rich in betacarotene, which thebody 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 ofthe 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.
B. The flesh of SPK004 differs from that of the currently cultivated sweet potatoes incolor 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 isneeded 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 inbeta-carotene than SPK004 is.
E. The currently cultivated varieties of sweet potato contain no important nutrients that SPK004 lacks.

答案是E，看了论坛上的帖子，看了解释，众说纷纭。

我实在不觉得E正确。首先E用了双重否定，搞得晕晕乎乎的，我对于E的理解是：现有的SP没有包含任何SPK004缺乏的营养素。直接一点说，就是现有的SP不比SPK004好而已啊。再直白一点，就是SPK004没有更差。那都差不多的话，为什么非得种新的SPK004呢？再说，原文中重点讲 vitamin-A，选项E说的范围大了，变成了宏观的nutrients.


再看选项D，清清楚楚说了SPK004含有的 vitamin-A最高，而原文就在讨论缺乏 vitamin-A的方案。这不就正好嘛？为什么不是D呢？


纠结啊纠结，求解答啊求解答！

EMMALIULIU

顶一下！

riverwind91

新品种VA含量高是既定的，那么该新品种的引进是否能够达到预想效果，关键就在于它会在多大范围受到推广，能否替代老品种。
D的意思只是肯定了新品种的VA含量高，但没有提供能影响新品种推广的其他信息，还是不充分支持题干
E阐明新品没有缺陷，还VA含量高，那么言下之意就是新品种可以大规模替代老西红柿，比D提供的support强好几条街了。

slgbond

此题应该是简单题
逻辑链：problem-plan，support the plan
problem：缺乏VA，解决办法是plan spk004

D ：没有作物beta胡箩卜素比spk004多；没用啊，VA多才支持啊，根本一个无关项