Another problem related to the principle of dialectical unity of subjective initiative and objective regularity is the relationship between social and historical trends and topic selection. The inevitability of historical development stipulates that human activities should be restricted by regularity, but it does not deny people's choice in the space of possibility. Topic selection is a variety of possibilities for the future development of social life under given historical conditions. It is the objective premise of the choice of the subject, and the interest and demand of the subject are the internal basis of the choice. Example:/kloc-After the middle of the 9th century, China was bullied by foreign powers, and its internal strength was weak, so the people of China were faced with a major choice. China's * * * production party led the people of China to embark on the road of new democracy and socialist revolution. After the founding of People's Republic of China (PRC), China faced different choices in socialist transformation and construction. Under the leadership of the Communist Party of China (CPC), after repeated practice and exploration, we have embarked on the road to success in building Socialism with Chinese characteristics.