单项选择题

According to the passage, the first full-scale giant recycling plants will ______.

A．be built in Britain
B．appear in 15 years
C．take us 15 years to build them
D．be found only in some big cities
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单项选择题
According to the passage, the reason for big cities to build their own recycling plants is that ______.
A．they can be of great help to the protection of environment
B．it is more expensive to process wastes in a farther dump
C．they can make the wastes into something that is useful
D．they can produce a lot of energy for the local residents
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