Test analysis: In the ancient history of China, "the sage of books" refers to Wang Xizhi, and "the sage of painting" refers to Wu Daozi, so A is chosen. Du Fu is called "Poet Saint"; Zhang Xu was a calligrapher in Tang Dynasty, and was praised as "the sage of grass" by later generations. Gu Kaizhi, a painter and calligrapher in the Eastern Jin Dynasty, is known as one of the "Four Masters in the Six Dynasties". Li Bai enjoys a high reputation as a poet.
Comments: This question is less difficult. It examines students' memory ability of historical knowledge. The calligraphy of Wang Xizhi, a calligrapher in the Eastern Jin Dynasty, has the reputation of "flowing freely and agile as a dragon". The masterpiece is Preface to Lanting, which has the reputation of "the best running script in the world". Wu Daozi is a famous painter in the Tang Dynasty, and his masterpieces include Born of Gautama Buddha and Golden Bridge Map.