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
Those who let uncertainty ______ rarely achieve much.
A．turn them down
B．send them down
C．weigh them down
D．huddle down
单项选择题
Humans should not develop their economy at the ______ of the ecological environment.
A．destruction
B．pollution
C．expense
D．mercy
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