差别定价是指企业按照两种或两种以上反映成本费用的比例差异的价格销售产品或服务( )
A. 对
B. 错
The computer will (monitor) all of the car's movements.
A. 促进
B. 模拟
C. 塑造
D. 监测
I had no (appreciation) of the problems they faced.
A. 依赖
B. 承诺
C. 理解
D. 同意
Will you (collaborate) with me to finish the project?
A. 合作
B. 替代
C. 竞争
D. 打击