25. Reason D: There is a saying in junior high school politics that in China, under the socialist market economy system, public ownership is the main body and multiple ownership systems coexist. Therefore, ③ exclusion method, ① can be excluded according to exclusion method.

26. Reason B: Taiwan Province Province, so it cannot be said that the great cause of reunification has been completed.

27. Reason D: The material is about Hong Kong and Macao, which is obviously the reunification of the motherland.

29. Reason A: Politics is also emphasized in junior high schools, and the premise of Taiwan Province Province's problems is to adhere to the one-China principle.