Which of the following is not the branch of American Federal government

A．In male adults the vocal cords are typically longer than in female adults.
B．In male adults the vocal cords are typically shorter than in female adults.
C．In male adults the vocal cords are typically thinner than in female adults.
D．The vocal cords in both male and female adults are of the same lengt

A．they can't pronouce the sound [ n]
B．they do not like to pronounce nasal sounds
C．interlangue interference because there is not [ n] in Wuhan dialect
D．their teachers do not have a good teaching method