51.Since ancient times, the Chinese people usually celebrate harvest in the Mid-Autumn, which is similar to the custom of celebrating Thanksgiving in the North America. The tradition of celebrating Mid-Autumn festival became popular throughout China in the early Tang dynasty. The lunar Au-gust 15 is a day for people worshiping the moon. On this day, under the dazzling bright moon,families reunite and enjoy the moon' s beauty. In 2006, Mid-Autumn festival was listed as one of China' s cultural heritage, and in 2008, it was classified as a public holiday. Moon cakes, as indis- pensable delicious food of the festival, were gifts people sent to families and friends during the fes-rival and usually eaten on family gatherings.