【答案解析】{{B}}Passage 1{{/B}} As a main developing country in the course of rapid industrialization and urbanization, China's domestic demand (esp. the consumption demand) is yet in constant depress. Obviously, the situation is not caused by its short-term policies, but it indeed reflects the imbalance of the economy and social structure as a whole. The cheap laborers (rural migrant laborers) have greatly involved in the industrialization and have created tremendous product supplies, but they cannot become consumers in urban areas. Thus, a great gap between supply and demand is created. So China's development of next 30 years depends on whether we can, with the accomplishments of past 30 years, focus on the essence of the social economic development, and eliminate identity discrimination against rural migrant laborers step by step. We should also carry out policy innovation so as to start up another round of fast economic growth and balanced social development in next 30 years. The key to this lies in realizing the citizenship mechanism and policy innovation for those rural workers. The new policies will just be like the household contract responsibility system 30 years ago, initiate system reform and social changes in chain, and become the engine driving social economic development for the next 30 years.