fei fei Q89

[aqboy[origen]]

89.
Rhizobium bacteria living in the roots of bean plants or other legumes produce fixed nitrogen, which is one of the essential plant nutrients and which for non-legume crops, such as wheat, normally must be supplied by applications of nitrogen-based fertilizer. So if biotechnology succeeds in producing wheat strains whose roots will play host to Rhizobium bacteria, the need for artificial fertilizers will be reduced.

The argument above makes which one of the following assumptions?

(A) Biotechnology should be directed toward producing plants that do not require artificial fertilize.
(B) Fixed nitrogen is currently the only soil nutrient that must be supplied by artificial fertilizer for growing wheat crops.
(C) There are no naturally occurring strains of wheat or other grasses that have Rhizobium bacteria living in their roots.
(D) Legumes are currently the only corps that produce their own supply of fixed nitrogen.
(E) Rhizobium bacteria living in the roots of wheat would produce fixed nitrogen.

ANS:E

請問C未甚麼不行? 感謝~~

[canadacom_orig]

c 的選項不能保證他的推論正確

不管原來有或沒有皆不可確定推論

也就是可以不需要用肥料

有可能本來有那種細菌但是不會製造養分 或是 細菌不夠之類的

但是e可以使他的推論正確 確保新的技術可以不需要人工肥料