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閱讀理解

In ancient time， dancing was used to share information. For instance， if the head man of a primitive tribe wanted his men to hunt for food， he would first dance around acting like an animal and then he would change his dancing to pretend to shoot an animal. He would try to have his men follow his example. When he was sure that his followers understood his intention， he would lead his excited hunters to chase and kill the animals they needed for food. In modern times， dancing is mainly for physical exercises. Most people do not care much about whether they are dancing gracefully or not. Of more importance is that they move their bodies for half an hour or so. For these people， dancing is another way of getting their daily exercises.

The main idea of this paragraph is__________.

A.The functions of dancing are gradually changed from the ancient to the modern because of the developments of the society.

B.Dancing serves people in many different ways.

C.Dancing， apart from its main function as a means of entertainment or a form of recreational activity， has other functions.

D.Dancing had developed itself well from time to time.

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