求教prep和gwd上两道逻辑题

穆汐寒

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 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)        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    我选了B
求解？B的意思是说这个新种的和一般的不一样，那不是更好辨别更有针对性的吃？
E有什么关系呢。。。题目里也没说要把现在的全部换成SPK400？

Fiona09

关于第一个疑问，可以参考Helr大神的解析

https://gmat.la/question/Prep2008E2-CR-102

穆汐寒

GWD-23-Q14
Plantings of cotton bioengineered to produce its own insecticide against bollworms, a major cause of crop failure, sustained little bollworm damage until this year.  This year the plantings are being seriously damaged by bollworms.  Bollworms, however, are not necessarily developing resistance to the cotton’s insecticide.  Bollworms breed on corn, and last year more corn than usual was planted throughout cotton-growing regions.  So it is likely that the cotton is simply being overwhelmed by corn-bred bollworms.
In evaluating the argument, which of the following would be most useful to establish?
A.        Whether corn could be bioengineered to produce the insecticide
B.        Whether plantings of cotton that does not produce the insecticide are suffering unusually extensive damage from bollworms this year
C.        Whether other crops that have been bioengineered to produce their own insecticide successfully resist the pests against which the insecticide was to protect them
D.        Whether plantings of bioengineered cotton are frequently damaged by insect pests other than bollworms
E.        Whether there are insecticides that can be used against bollworms that have developed resistance to the insecticide produced by the bioengineered cotton

答案给的B，但是题目里不是说Plantings of cotton bioengineered ... sustained little bollworm damage until this year.这里从头到底没提到non- bioengineered的cotton？我以为这里种的全是bioengineered cotton来着。。。
再看D，假如有别的虫子会造成damage, 那不就是他因？