题目

—Mary told me she would﹍﹍computer studies.    —Really? I’ll try my best to ask her to﹍﹍such foolish ideas. A. pick up; give up     B. put away; give up C. give up; put away   D. give up; pick up 答案：C 解析: 选C。give up 放弃(某些行动)；put away放弃(某些相法；观点；认识等)2．下列物质属于纯净物的是（　　）A．汽油B．福尔马林C．冰醋酸D．聚氯乙烯