A small child has to learn to keep its _____ before it can walk far. ( 章节：8 难度：2)_做题室

单项选择题A small child has to learn to keep its _____ before it can walk far. ( 章节：8 难度：2): A、feet; B、balance; C、arms; D、legs

正确答案：B
答案解析：
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