【正确答案】Mid-Autumn Festival originated from people's worship on the moon. China is an ancient agricultural country. After long-term observation, ancient Chinese believed that movement of the moon has major influence on agricultural production and seasonal changes, so worship on the moon became an important activity with sacrifice offered to the moon, to pray for long-term prosperity of the country. In long-term progress of history, people developed the custom of celebrating the moon while holding worship activities. Mid-Autumn Festival became a fixed festival approximately in Tang Dynasty. In Northern Song Dynasty, Mid-Autumn Festival had become a popular folk festival nationwide.