单项选择题

What is the passage talking about（）

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

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单项选择题
Aluminum is found on earth mostly in the form of（）

A．pure metal
B．bauxite
C．gold
D．liquid
单项选择题
The price of aluminum was sharply reduced when people discovered a new refining process with the aid of（）

A．wind
B．solar energy
C．hydraulic power
D．electricity
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