最早萌出的乳牙是
A．上颌乳尖牙B．上颌乳中切牙C．上颌第一乳磨牙D．上颌第二乳磨牙E．下颌乳中切牙
参考答案：E
Nodding one's head ________ willingness while shaking one's head means disagreement.[ ]
A. indicates
B. declares
C. explains
D. speaks
音高、音强、音长、音色等是从语音（）性质的角度来分析的。
A.物理性质
B.生理性质
C.化学性质
D.社会性质
ile shaking one's head means disagreement.[ ] 