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
To their credit the Department of Energy ______ these ideas and funded a detailed study.
A．took over
B．took on
C．took up
D．took to
单项选择题
A．dealB．saleC．sellingD．business
A．deal
B．sale
C．selling
D．business
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