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标题: GWD1-Q15 [打印本页]

作者: adolfgao    时间: 2011-7-19 06:46     标题: GWD1-Q15

GWD1-Q15
In parts of South America, vitamin-A deficiency is a serious health problem, especially among children.In one region, agriculturists are attempting to improve nutrition by encouraging farmers to plant a new variety of sweet potato called SPK004 that is rich in beta-carotene, 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.The growing conditions required by the varieties of sweet potato currently cultivated in the region are conditions in which SPK004 can flourish.

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

D.The varieties of sweet potato currently cultivated in the region contain some important nutrients that are lacking in SPK004.

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

答案为A 错选C  
C的错误原因是什么啊?

作者: chipmunk    时间: 2011-7-19 21:23

Too strict. There might be one that is better than SPK004, but it might require stringent condition to grow, for example.
作者: fyf19871214    时间: 2011-7-23 21:28

取非测试
C是干扰选项,假设有其他的种类,可以种比SPK004更rich的种类,但并不是说不可以种SPK004(比如其他品种可能水土不服,尽管实验室里种出来比SPK004更nutrient)
A选项,假设SPK004不能在这里flourish,那就不要搞了,题干结论直接不成立,因此是必要选项。
作者: adolfgao    时间: 2011-7-24 21:33

thx!




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