题目内容
腮腺导管开口于（）；下颌下腺和舌下腺导管开口于（）。
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下列哪些是下颌下腺导管易形成结石的原因（）
The speeches at a competition are presented in according with strict rules of ____,____, and ____.
Speakers at a competition are not judged solely on their vocabulary, pronunciation, or ____. Rather they are judged on their ability to use English as a ____, in formulating and communicating their ideas.
Effective delivery of a prepared speech requires dynamic ____, with complete control of ____, ____, ____ and ____
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