The Chinese believe that all forms of life are controlled by movements of energy. There are two basic movements. One is outward moving, and is called “Yin”. The other is inward moving, and is called “Yang”. When an outward movement reaches its limit, it changes direction and starts to move inwards. Similarly, when an inward movement reaches its limit, it changes direction and starts to move outwards. The operation is like a pump, and this constant pumping movement may be seen in almost every form of life—the human heart, for example.

(92 words)

　　What is the passage mainly about?
　　 A) Functions of “Yin” and “Yang”.　　　　
　　 B) Balance of outward and inward movements.　　　　
　　 C) Limits of outward moving and inward moving.　　　　
　　 D) The operation of the human heart.
　　　　

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