Syllables are short when they are stressed.（）

The most powerful signal of stress is a change of pitch...

判断题The most powerful signal of stress is a change of pitch on the vowel.（）

Of the four possible tune movements, high fall is used ...

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.（）

Usually low key is used for emphasis and contrast; mid ...

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.（）