附着水平的位置与釉牙骨质界相距超过多少时牙周治疗预后较差
A．1mm
B．2mm
C．3mm
D．4mm
E．5mm
参考答案：D
— What do people wear when they go to the theatre?
— Well, it isn't very ____. People can wear anything they like.[ ]
A. normal
B. certain
C. modern
D. simple
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