成本推动型通货膨胀可分为（）。
A.工资推动
B.预期推动
C.价格推动
D.利润推动
参考答案：A, D
A personal computer doesn't ____ much now. I'm going to buy one. [ ]
A. take
B. cost
C. spend
D. pay
型腔表面成镜面状态时，有污渍应该用（）擦净。
A.手指
B.脱脂棉
C.铜刮勺
D.锉刀
