简答题An interactive language environment is the necessary condition for language acquisition.简答题Children’s utterances at the stage from telegraph to infinity are sometimes referred to as (1) speech.简答题Children learn their mother tongue mainly by reinforcement from adults.简答题Exposure to language is needed for language acquisition.简答题The holophrastic stage typically starts sometime after (1) year.简答题One of the phonetic features for caregiver speech is preference for words with the form consonant-vowel-(1)-vowel.