参考答案: As a specialty of Beijing cuisine, Beijing roast duck is unique in not only delicious taste, but also rich nutritional value. Acclaimed as the “No. 1 Delicacy under Heaven”,it has won fame both at home and abroad. It takes about 45 minutes to roast a duck. The roasted duck is characterized by crispy skin and tender meat, which form the biggest reason for its popularity. The most famous brands among popular roast duck restaurants are Quanjude and Bianyifang, both of which have a history of several hundred years.