单项选择题

Aluminum is found on earth mostly in the form of（）

A．pure metal
B．bauxite
C．gold
D．liquid

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热门试题

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

单项选择题

Which of the following is NOT true（）

A．Aluminum is widely used in transportation.
B．Aluminum is also used in many parts of airplanes.
C．Aluminum is being used extensively in the building industry.
D．Aluminum is not used in its pure form.