题目

---Do you know these       over there? They're so handsome.    ---Yes, they are my friends.    A. policemans      B. Canadas        C. Germen        D. heroes 答案：D下列叙述中不属于机械运动的是（ ）A．汽车飞驰 B．火箭升空 C．蝴蝶飞舞 D．心潮澎湃