判断题 Of the four possible tune movements, high fall is used for statements and wh-questions; high rise is used for questions asking for repetition of something; low rise is for yes/no questions, etc. and fall rise is for corrections and polite contradictions.（）

判断题 Usually low key is used for emphasis and contrast; mid key indicates an expected, neutral attitude; and low key provides low information.（）

判断题 Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）