The speaker implies________.( )
· parents canever hope to teach their childrenew sounds
· childreno longer imitate people after they begito speak
· childrewho are good at imitating learnew words more quickly
· eveafter they have learnt to speak, childrestill enjoy imitating

单选题
· they need different amounts of listening
· often take a long time in learning to listen properly
· an expression of his moods and feelings
· is not especially important because the changeover takes place gradually
· even after they have learnt to speak, children still enjoy imitating