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单项选择题

The passage is mainly about ______.

A．a cheap way to get energy
B．the location of recycling plants
C．new ways of recycling wastes
D．the protection of city environment

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单项选择题What's the main reason for big cities to build their own recycling plants

A．To deal with wastes 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.

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