28____．A．foodB．restC．studyingD．playing
28____．
A．food
B．rest
C．studying
D．playing
相关考题：
What can be inferred from the last paragraph?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.