填空题

According to the author, the development of laughter is based on ______.

【参考答案】

the development of speech
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单项选择题
A．The Japanese mathematic teachers.B．Both the speaker and his German friend.C．Both Americans and immigrants.D．The son of the speaker’s German friend.
A．The Japanese mathematic teachers.
B．Both the speaker and his German friend.
C．Both Americans and immigrants.
D．The son of the speaker’s German friend.
填空题
A baby begins to laugh and becomes a comparatively sophisticated creature when he is at the age of ______.
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