觉得狒狒宝典中feifei-89答案有问题

题目如下:

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.

   在论坛下载得狒狒详解中答案是E.个人觉得这道题目可以引起争议,因为B选项存在.这样即使植物不需要人工肥料提供固态氮,它们还是需要人工肥料提供别的元素.不能得出人工肥料的需求将减少的结论.(以偏概全的错误)当然了,本人认为E选项不对的解释有点牵强(正确的E应该是如果科学家能够让细菌在谷物的根中生活,那么细菌就能提供固态氮)

    想请牛牛们帮我分析两点

    1)本人的题目阅读理解有无问题.这个问题的重要性超过答案本身

    2)逻辑思路有无问题.重要性次之,因为自我感觉逻辑分析没有问题.

    请指教,谢谢

good defense！

however， pay atttention，reduce the amount of nitrogen-based artificial fertilizer is still called decrease. What if all kinds of articical fertilizers are used in planting wheat strains, meanwhile nitrogen-based artificial fertilizer use is decrese?

E is better and if E is negative, the whole conclusion will be weakened

E is the answer for sure

If F bacteria won't generate any nutrition, no decrease in the use of fertilizer would appear.

B looks good defence, please be aware of the difference. If fixed-nitrogen is a part of nutrition that needs to be fertilized by artificial fertilizers. But this part is getting down, it is possible that total amount is getting down.

B isnot that better than E

开始也选了b，仔细看了看，应该是E。又上了陷阱了，讨厌的ETS。

So if biotechnology succeeds in producing wheat strains whose roots will play host to Rhizobium bacteria, the need for artificial fertilizers will be reduced.

Well pointed!   Suppose Total AF = AF1 + ( AF2 + AF3 + ...). If AF1 is decreased while the subtotal in the bracket kept constant, "the need for artificial fertilizers will be reduced".