The first full-scale giant recycling plants are perhaps fifteen years away. Indeed, with the growing cost of transporting rubbish to more distant dumps, some big cities will be forced to build their own recycling plants before long.
21. The phrase be well on with ... most probably means _____.
have completed what was started have achieved a great deal in
get ready to start put an end to
22. What is NOT mentioned as a part of the recycling process described in Paragraph 3?
Breaking up whatever is breakable.
Sharpening metal bars.
Separating light elements from the heavy ones.
Sorting out small pieces of metal.
23. Whats the main reason for big cities to build their own recycling plants?
To deal with wastes in better way.
To protect the environment from pollution.
To get raw materials locally.
To get big profits from those plants.
24. The first full-scale huge recycling plants ______.
began to operate fifteen years ago
will probably take less than fifteen years to build
will be built fifteen years later
will probably be in operation in fifteen years
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