单项选择题

In mathematics the term "solid" describes a geometric figure with three dimensions.

A．angle
B．shape
C．triangle
D．equation
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单项选择题
The folk art rubric has also been extended to include all manner of traditional artistic productions, even the self-consciously quaint.
A．conservative
B．mysterious
C．original
D．unusual
单项选择题
Floors and walls must be specially constructed to make a building soundproof.
A．solid and sturdy
B．officially complete
C．impermeable to noise.
D．architecturally attractive
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