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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单项选择题
The American professor came to realize that he had underestimated the ______ of most of the Chinese students.
A．magnitude
B．gradient
C．potential
D．firmness
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
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