题目

 The teacher told her Senior 3 students that it was important to ___________ time for relaxation under great pressure. A. set up           B. set about               C. set down            D. set aside 答案：D下列混合物能用分液法分离的是（　　）A．四氯化碳和水B．食盐和蔗糖的混合液C．碘水D．碳酸钙悬浊液