What is her problem in learning mandarin tones( 四声 )?
A.
Mandarin tones reminds her of strange animals.
B.
She was puzzled about the difference in mandarin tones.
C.
She has not yet acquired the initials ( 声母 ) and finals ( 韵母 ).
D.
A 15-year-old student tells her that her tongue is not yellow enough.