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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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
单项选择题
After 10 hours at the wheel of the car, he began to feel the ______.
A．tension
B．nervous
C．exertion
D．strain
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