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The price of aluminum was sharply reduced when people discovered a new refining process with the aid of ______. Aluminum is fou
The price of aluminum was sharply reduced when people discovered a new refining process with the aid of ______. Aluminum is fou
admin
2009-08-21
147
问题
The price of aluminum was sharply reduced when people discovered a new refining process with the aid of ______.
Aluminum is found on earth mostly in the form of ______.
选项
A、pure metal
B、bauxite
C、gold
D、liquid
答案
B
解析
本题为客观细节题。从最后一段“it is fortunate that bauxite(铝土矿),which is one of its chief sources,is also one of the earth’s most plentiful substances”可知铝主要以铝土矿的形式存在。
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