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GRE阅读题目解析:地壳包含的矿物矿石

2017-03-20 09:54:00来源:网络

  GRE阅读题目解析:地壳包含的矿物矿石】GRE考试考什么?GRE阅读是重点。新东方在线GRE频道为大家带来GRE阅读题目解析:地壳包含的矿物矿石,答案见下一页,希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

  查看全部:GRE阅读答案解析(汇总)

  GRE阅读题目解析:地壳包含的矿物矿石

  P3

  Eight percent of the Earth‘s crust is aluminum, and there are hundreds of aluminum-bearing minerals and vast quantities of the rocks that contain them. The best aluminum ore is bauxite, defined as aggregates of aluminous minerals, more or less impure, in which aluminum is present as hydrated oxides. Bauxite is the richest of all those aluminous rocks that occur in large quantities, and it yields alumina, the intermediate product required for the production of aluminum. Alumina also occurs naturally as the mineral corundum, but corundum is not found in large deposits of high purity, and therefore it is an impractical source for making aluminum. Most of the many abundant nonbauxite aluminous minerals are silicates, and, like all silicate minerals, they are refractory, resistant to analysis, and extremely difficult to process. The aluminum silicates are therefore generally unsuitable alternatives to bauxite because considerably more energy is required to extract alumina from them. (153 words)

  4. The author implies that a mineral must either be or readily supply which of the following in order to be classified as an aluminum ore?

  (A) An aggregate

  (B) Bauxite

  (C) Alumina

  (D) Corundum

  (E) An aluminum silicate

  For the following question, consider each of the choices separately and select all that apply

  5. The passage supplies information for answering all of the following questions regarding aluminous minerals

  □A Are aluminum-bearing nonbauxite minerals plentiful?

  □B Do the aluminous minerals found in bauxite contain hydrated oxides?

  □C Are aluminous hydrated oxides found in rocks?

  6. The author implies that corundum would be used to produce aluminum if

  (A) corundum could be found that is not contaminated by silicates

  (B) the production of alumina could be eliminated as an intermediate step in manufacturing aluminum

  (C) many large deposits of very high quality corundum were to be discovered

  (D) new technologies were to make it possible to convert corundum to a silicate

  (E) manufacturers were to realize that the world‘s supply of bauxite is not unlimited

  点击下一页查看答案:

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