单项选择题

Our civilization cannot be thought of as ______ in a short period of time.

A．to have been created
B．to be created
C．having been created
D．being created
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单项选择题
As I regard it, you can widen the ______ of these improvements through your active participation.
A．volume
B．dimension
C．magnitude
D．scope
单项选择题
The introduction of fabrics made from rayon, nylon and other ______ fibers has made many changes in our civilization.
A．manufactured
B．artificial
C．synthetic
D．manned
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