题目

Chinese cuisine is widely known and enjoyed all around the world. Who doesn’t long for a favorite Chinese dish? But there is one interesting concept concerning Chinese food which is almost unheard of in the West, and which is becoming increasingly ignored by the youth of the East—the ancient custom of “tonic food”.Tonic food is food which is consumed to improve one’s well-being or avoid sickness. For instance, it was once the custom for new mothers to eat a sesame oil (麻油) hot pot every day for the first month after giving birth. It was believed that this dish would benefit the m我国第一艘航空母舰已进行了多次海航测试．舰载飞机从航母滑跃起飞的过程中，以航母为参照物，飞机是    的．由于机翼的上下表面气流速度不同，存在压强差，使向上的升力    （选填“大于”、“等于”或“小于”）飞机受到的重力，飞机就能升空．