题目

The city of Yangzhou came into being at the Spring and Autumn Period ( about 500 AC ).As the key transportation link at joint (连接处) place of the Great Canal（运河）( Beijing-Hangzhou) and Changjiang (Yangtze River), Yangzhou has been from the Sui Dynasty (600 AD.) an economically rich city, and then reached its top in the Tang Dynasty. At that time, Yangzhou was a famous port and one of few biggest cities in East Asia.      With the improvement of the local economy and easy transportation way, there happened in the history a special local culture, which has an important pl同学们喜欢吃的老醋蛰皮的原料是海蜇，海蜇属于（　　）动物． A、腔肠动物B、扁形动物C、软体动物D、环节动物