2. 外语
  3. Floors and walls must be specially constructed to make a building soundproof.

Floors and walls must be specially constructed to make a building soundproof.

admin2011-02-26  63
问题 Floors and walls must be specially constructed to make a building soundproof.
选项 A、solid and sturdy
B、officially complete
C、impermeable to noise.
D、architecturally attractive
答案C
解析
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