单选题 During language acquisition, children go through several stages, during which stage they begin to have sensitivity to the phonetic distinctions used in their parents' language.
【正确答案】 A
【答案解析】解析：孩子们的语言习得要经历三个阶段，单词句阶段，双词句阶段，以及三词句阶段。在单词句阶段，孩子们会对其父母话语中的语音特征特别敏感。