下列哪些费用属于变动成本()
A.管理人员的工资
B.直接原材料费
C.折旧
D.直接生产工人的工资
E.包装费
正确答案是BDE
Complete the following sentence with a (compound) word derived from the one given in bracket.
Some people believe that smoking may（ ）one's life. Not only cancer, but also heart and lung diseases are related with smoking. (short)
