B This question examines the water cycle. The water cycle can be divided into inter-sea circulation, intra-sea circulation, and intra-land circulation. The main links of the water cycle are: evaporation, precipitation, water vapor transport, surface runoff, infiltration, underground runoff, plant transpiration, etc. Qinghai Lake is located in the Qinghai-Tibet Plateau region and participates in the internal circulation on land. So choose option B for this question.