GMAT考试资料：GWD试题合集（十六）.

　　以下将为正在备战GMAT考试的同学们整理一些经典的GMAT阅读试题，并分多个合集推出，希望能够为正在备考GMAT考试的考生提供或多或少的帮助。

　　GWD-6-Q23:

　　The primary purpose of the passage is to

　　A. discuss an objection to Gurney’s theories about the uses of indicator minerals

　　B. explore the formation of diamonds and the reasons for their scarcity

　　C. analyze the importance of kimberlite pipes in the formation of diamonds

　　D. dine the characteristics of indicator minerals under differing conditions

　　E. explain a method of determining whether kimberlite pipes are likely to contain diamonds

　　In the 1970’s the process of locating profitable pipes was rined by focusing on the subtle differences between the chemical signatures of indicator minerals found in diamond-rich pipes as opposed to those found in barren pipes.

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　　GWD-6-Q24:

　　Each of the following is mentioned in the passage as a difference between G10 garnet and other versions of garnet EXCEPT

　　A. level of oxidation

　　B. commonness of occurrence

　　C. chemical signature

　　D. place of formation

　　E. appearance in conjunction with diamonds

　　For example, G10 garnets, a type of garnet typically found in diamond-rich pipes, are lower in calcium and higher in chrome than garnets from barren pipes. Geochemists John Gurney showed that garnets with this composition were formed only in the diamond-stability field; more commonly found versions came from elsewhere in the mantle.

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　　GWD-6-Q25:

　　The passage suggests that the presence of G10 garnet in a kimberlite pipe indicates that

　　难

　　A. the pipe in which the garnet is found has a 90% chance of containing diamonds

　　B. the levels of calcium and chrome in the pipe are conducive to diamond formation应该是in the garnet的level of c and c

　　C. the pipe passed through a diamond-stability field and thus may contain diamonds

　　D. any diamonds the pipe contains would not have come from the diamond-stability field

　　E. the pipe’s temperature was so high that it oxidized any diamonds the pipe might have contained

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　　GWD-6-Q26:

　　According to the passage, Gurney rined the use of ilmenites in prospecting for diamonds in which of the following ways?

　　A. He found that ilmenites are brought up from the mantle by kimberlite pipes and erode out into the surrounding land in greater quantities than diamonds.

　　B. He found that since ilmenites do not form in the diamond-stability field, their presence indicates the absence of diamonds.

　　C. He showed that highly oxidized iron content in ilmenites indicates a low survival rate for diamonds.

　　Gurney also found that though ilmenites did not form in the diamond-stability field, there was a link usul for prospectors: when the iron in ilmenite was highly oxidized, its source pipe rarely contained any diamonds.

　　D. He found that when the iron in ilmenites is highly oxidized, conditions in the magma were probably conducive to the formation of diamonds.

　　E. He showed that ilmenites take on more or less oxygen in the kimberlite pipe depending on the concentration of diamonds.

　　以上就是本期GMAT试题的所有内容，考生可以此为据并进行针对性的练习，逐步掌握GMAT阅读的解题规律及技巧，以达到迅速提高GMAT考试成绩的目的。 相关链接：

1.GMAT考试资料：GWD试题合集（十五）

2.GMAT考试资料：GWD试题合集（十四）

3.GMAT考试资料：GWD试题合集（十三）

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