中国书法是一门独特的艺术，是世界上独一无二的艺术瑰宝。 A: Chinese calligraphy is a gate to special art and the world’s art treasure. B: As a kind of Chinese calligraphy, the unilateral and incomparable art treasure in the world. C: Chinese calligraphy is a unique art and the unique art treasure in the world. D: Chinese handwritings are a unique art and the universal art treasure in the world.