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?


There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do.

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.

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.

There are no other varieties of sweet potato that are significantly richer in beta-carotene than SPK004 is.

The currently cultivated varieties of sweet potato contain no important nutrients that SPK004 lacks.

考题讲解

情景:在南美的部分地区,维生素A缺乏是一个严重的健康问题。在一个地方,农业学家打算引入SPK004这种甜土豆,由于甜土豆是当地的主要食物,并且现在种植的甜土豆含有很少量的beta-carotene,所以鼓励农民种SPK004这种的甜土豆的计划会很成功。

推理:推理文段最后其实是预测这个方案可能会成功,并且由于问题问的是我们对于方案本身的想法,因此,本题是方案推理,推理结构为:
目标:To improve nutrition
方案:Encouraging farmers to plant a new variety of sweet potato called SPK004 that is rich in beta-carotene

选题方式:方案推理有三个评估方向,简而言之,即,答案选项一定和方案的内容相关。

选项分析:

A选项:在该地区,没有其它的蔬菜含有比现在种的土豆更多的betacarotene无论其它蔬菜怎么样,只要SPK004这种的甜土豆有好处,就可以得到现有的结论。所以本选项不能评估方案推理。

B选项:SPK004的颜色和质地与现在种植的甜土豆不同,所以传统食物用SPK004做出来会和现在不一样。无论做出的东西和现在是不是一样的,只要大家依然会吃这种食物,那么就不会给计划带来什么问题,所以本选项没有提及方案。

C选项:为了成功的种植SPK004,其土壤的含氮量需要比现在种植的甜土豆的土壤的含氮量高。本选项给方案增加了额外的困难,但是其不能证明这个内容可以使得方案不可行,可以排除。

D选项:
没有其他的种类的甜土豆比SPK004含有的betacarotene更多。就算有其他的甜土豆含有有效成分更多,最多可以质疑我们是不是要选取种植SPK004这个东西,但是并不能反驳种植SPK004这个计划是否可以让人们增加营养的摄入。

E选项:
Correct. 现在种植的土豆不会含有一些SPK004没有的重要营养物质。如果现在的甜土豆含有一些SPK004缺少的东西,那么可能将现在的土豆全部换成SPK004就会有很大的风险,可以削弱方案。属于CQ3:方案的否定性副作用

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