单项选择题

Clothing made of plastic fibres has certain advantages over ______ made of natural fibres like cotton, wool, or silk.

A．one
B．the one
C．that
D．what
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单项选择题
If we fail to act now, said Tom, We'll find ourselves ______ in action later on.
A．paid back
B．paid for
C．paid up
D．paid off
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
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