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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

　　P3

　　1

　　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.

　　地壳的 8% 是铝，有超过百种含铝的矿物以及大量含铝矿物的矿石。

　　2

　　The best aluminum ore is bauxite, defined as aggregates of aluminous minerals, more or less impure, in which aluminum is present as hydrated oxides.

　　最好的铝矿石是铝土矿，这是一种纯度不一的含铝矿物聚成岩，铝以水合氧化物的形式存在其中。

　　3

　　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.

　　大量出现的铝矿石中以铝土矿含量最高，而且它可以产出三氧化二铝，是制取铝的中间产物。

　　4

　　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.

　　三氧化二铝也天然地存在于刚玉中，但这种矿物并未发现大量的高纯度蕴藏，因此不是符合实际的制铝资源。

　　5

　　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.

　　很多非铝土矿的含铝矿物大部分是硅酸盐，和所有的硅酸盐一样，它们耐高温，不易分解，极难加工。

　　(refractory 执拗的，耐高温的，难以治愈的)

　　6

　　The aluminum silicates are therefore generally unsuitable alternatives to bauxite because considerably more energy is required to extract alumina from them. (153 words)

　　因此含铝硅酸盐通常不适合作为铝土矿的替代方案，因为要从中提取铝，需要多消耗相当数量的能源。

　　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

　　选 C

　　难点在于审题，作者认为一种矿物质必须是 ___ 或者提供 ___ 才能被称为铝矿石，句 2 说到水合氧化物，句 3、4 出现了三氧化二铝，综合来看选 C，只有包含三氧化二铝的矿石，才被称为铝矿石。

　　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?

　　选 ABC

　　A 见句 5 。Most of the many abundant nonbauxite aluminous minerals …

　　B/C 见句 2：

　　The best aluminum ore is bauxite, defined as aggregates of aluminous minerals, more or less impure, in which aluminum is present as hydrated oxides.

　　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

　　选 C

　　见句 5

　　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.

　　如果这个不利条件改变，则刚玉也可以作为生产铝的一种理想的原料矿石，所以选 C 。

　　以上就是新东方在线GER频道为你带来的GRE阅读题目解析:地壳包含的矿物矿石，更多精彩敬请关注新东方在线GRE频道。

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