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 waste
D．the word rubbish could lose its meaning
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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.
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
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