Analysis of test questions: Chinese characters are the carrier of Chinese culture, and developing Chinese writing activities is conducive to protecting the carrier of Chinese culture and consolidating the cultural foundation of the Chinese nation, so the topic ① is correct; Problem limb 2 is not consistent with the meaning of the problem, so it is excluded; Topic 3 is not the meaning of developing Chinese writing activities, so it is excluded; Chinese characters play an important role in the inheritance of China culture, so the topic is right; The answer is a.