题目内容

Language, too, is the product of labor. In farming and hunting and in war, people had to work in groups. They had to say something to one another. This led to the use of speech organs. The organs of the mouth learned to produce different speech sounds, and gradually man learned to speak.

A. Man learned to speak a long time ago.
B. People used to work in groups.
C. Language comes out from labor.
D. Man could only say something very easy at the beginning.

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