The context in which changes occurred 1. internal factors a, the end of the Cultural revolution"and the smash of gang of four idea of white cat and black cat" from class struggles to b. emancipation of ideas debates over the criteria of truth reconstruction of Chinese economy etc. C. open door policy(starting from the rural areas)The context in which changes occurred 1. internal factors a. the end of the “Cultural Revolution” and the smash of “gang of four”; b. emancipation of ideas debates over the criteria of truth; idea of “white cat and black cat “, from class struggles to reconstruction of Chinese economy etc.) c. open door policy (starting from the rural areas)