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  3. 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

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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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