单项选择题
A.voiceless，post-alveolar，and affricativeB.voiceless，dental，and fricativeC.voiced，dental，and fricativeD.voiced，post-alveolar，and plosive
A.Babies’cries have long been the concerns of scientists.B.Babies start their speech acquisition at the age of three months.C.Studying babies’cries helps us understand their speech perception.D.Babies’true speech，rather than their cries，should be the focus of study.
A.It begins with the birth of a baby.B.It begins before the birth of a baby.C.It begins when a baby starts imitating adults’speech.D.It begins with a baby’s cry melodies typical of its mother tongue.