GMAT逻辑题目:

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

　　The argument above makes which one of thefollowing assumptions?

　　A. Biotechnologyshould be directed toward producing plants that do not require artificialfertilize.

　　B. Fixednitrogen is currently the only soil nutrient that must be supplied byartificial fertilizer for growing wheat crops.

　　C. Thereare no naturally occurring strains of wheat or other grasses that haveRhizobium bacteria living in their roots.

　　D. Legumesare currently the only corps that produce their own supply of fixed nitrogen.

　　E. Rhizobiumbacteria living in the roots of wheat would produce fixed nitrogen.

　　参考答案：E

　　思路：原文的结论是“如果生物工程可以成功培育出能寄生根瘤菌的小麦品种，对人工肥料的需求就会减少”;“生活在大豆或其它豆科植物根部的根瘤菌产生固氮(一种重要的植物养份)”是结论的major premise，应该在二者之间搭桥建立联系，即小麦上寄生的根瘤菌同样能产生固氮。

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