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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单项选择题
I was ______ in my reading, and didn't at first hear the doorbell ring.
A．immured
B．immersed
C．busy
D．infatuated
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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