单项选择题

What is NOT mentioned as a part of the recycling process described in Paragraph 3

A．Breaking up Whatever is breakable.
B．Sharpening metal bars.
C．Separating light elements from the heavy ones.
D．Sorting out small pieces of metal.
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单项选择题
The phrase be well on with ( Line 1, Para. 1 ) most probably means ______.
A．"have completed what was started"
B．"got ready to start"
C．"have achieved a great deal in"
D．"put an end to"
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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