题目内容：
When does a baby begin to use more vowels and consonants?
A．When he is pleased． B．As he grows．
C．When he gets angry．
D．When he hears other baby crying．
参考答案：
答案解析：
单选题：When does a baby begin to use more vowels and consonants?
- 题目分类：公共英语四级
- 题目类型：单选题
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B．As he grows．
C．When he gets angry．
D．When he hears other baby crying．