ChaseDream

标题: 费费宝典第89题 [打印本页]

作者: browse 时间: 2003-11-23 23:01
标题: 费费宝典第89题
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.

答案是E,但E是文中第一句话就说明了的，这能算是assumption吗？
我选C为什么不对，到底什么才算是assumption,牛人指点一下，3x.

作者: 番茄炒蛋 时间: 2003-11-23 23:09
原文中的限制条件是bacteria living in the roots of bean plants or other legumes
但是WHEAT又不是属于其中的哪一种，所以当然是要做出一定的假设咯
至于C的naturally occurring strains of wheat 是否有这样的假设和原文好象没有什么关系嘛

作者: browse 时间: 2003-11-23 23:25
懂了，阅读太差，没注意到wheat 和 bean legume的区别。谢谢。

作者: ricee 时间: 2008-5-7 12:46

这是一道语法题，鉴定完毕！

作者: cindyaidover 时间: 2008-5-7 16:17

文章中说的是legume-corps中有Rhizobium bacteria，RB可以produce N，N对none-legume植物有好处

所以把RB放在none-legume中有好处

中间的假设就是RB在none-leguem中也可以制造N 这是可以被反过来test的

欢迎光临 ChaseDream (https://forum.chasedream.com/)