【判断题】The relative height of the pitch range will depend on the frequency of vibration of the vocal cords: the higher the frequency of vibration, the lower the pitch.
【单选题】听力原文: All the characteristics and abilities a person acquires and all developmental changes result from two basic, though complex, processes: learning and maturation. Since the two processes almost al...
A.
is generally a complex biological process
B.
has nothing to do with organic development
C.
is mostly independent of external environmental conditions
D.
is directed to changes that can be attributed to training