The following is my travel experience in Yang Yang. Areas that conform to folk customs are A. Qinghai-Tibet Plateau-Enclosure-Guoba Dance B. North China Plain-Pingding.

Analysis of test questions: Option A: Pot Zhuang Dance is a dance on the Qinghai-Tibet Plateau, but the enclosed house is a famous characteristic residential building in Hakka culture; Option B: Houses in North China Plain are flat-roofed, but dragon boat racing is an activity in the south. C selection is correct; D-option duet is a literary program in Northeast China, but the Songkran Festival is a traditional festival of the Dai people in the south.

Comments: This topic requires understanding the natural environment and characteristic folk customs in China. Local houses and customs are all formed in their unique natural environment, such as caves on the Loess Plateau and towers on the Qinghai-Tibet Plateau.