下列各项中，属于直接成本的有（）

A.构成产品实体的原材料

B.车间取暖费

C.车间生产工人工资

D.车间管理人员工资

—I think math is more useful than Chinese.

—I don't _____ you. They are both useful. [ ]

A. catch up with      

B. get on well with  

C. talk with        

D. agree with