In English, /ph/ and /p= / occur in different phonetic environments, they are the ______of
A. phones
B. allophones
C. voices
D. phonemes
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Which of the following is a voiceless bilabial stop?
A. [b]
B. [p]
C. [k]
D. [g]
对中国成人来说,以下哪一项为正常体重指数?
A. BMI= 6.7
BMI=18.4
C. BMI=29
D. BMI=24.5
E. BMI=22.3
Which of the following is NOT a bilabial?
A. [b]
B. [p]
C. [f]
D. [m]
Which of the following is NOT a fricative in English?
A. [f]
B. [z]
C. [p]
D. [v]