单项选择题

Acetate is one of the most important artificial fibers.

A．insulating
B．synthetic
C．unadorned
D．complex
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单项选择题
New England town meetings, in their most highly developed form, are assemblies of the voters.
A．protests
B．gatherings
C．responsibilities
D．liabilities
单项选择题
Gooseneck barnacles attach themselves to objects such as docks and boats.
A．fasten
B．propel
C．limit
D．compare
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