单项选择题

What's the main reason for big cities to build their own recycling plants（）

A．To deal with waste in a better way.
B．To protect the environment from pollution.
C．To get raw materials locally.
D．To get big profits from those plants.

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单项选择题

The first full-scale huge recycling plants（）

A．began to operate fifteen years ago
B．will probably take less than fifteen years to build
C．will be built fifteen years later
D．will probably be in operation in fifteen years

单项选择题

What is NOT mentioned as a part of the recycling process described in paragraph three（）

A．Breaking up what is breakable.
B．Sharpening metal bars.
C．Separating light elements from the heavy ones.
D．Sorting out small pieces of metal.