The price of aluminum was sharply reduced when people discovered a new refining process with the aid of ______. What is the pas

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问题 The price of aluminum was sharply reduced when people discovered a new refining process with the aid of ______.
What is the passage talking about?

选项 A、The features of aluminum and its functions.
B、The process of aluminum.
C、The discovery of aluminum.
D、The promising future of aluminum.

答案A

解析 本题为主旨归纳题。通观全文,我们可以得知,B、C、D各项只讲述了关于铝的一部分,只有A项概括了全文。
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