An aggregate
Bauxite
Alumina
Corundum
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
corundum could be found that is not contami-nated by silicates
the production of alumina could be eliminated as an intermediate step in manufacturing alu-minum
many large deposits of very high quality corun-dum were to be discovered
new technologies were to make it possible to convert corundum to a silicate
manufacturers were to realize that the world s supply of bauxite is not unlimited
答案:C/ABC/C
上文的题目大家答对了几题?大家不仅要多做题,更要善于总结,这样才会有针对性地提高。
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