下图是甲、乙、丙三企业产品成本及其构成比较:
材料成本最高的企业是()
A.甲和丙
B.甲
C.乙
D.丙
参考答案:D
______ all the texts that are written,stored, and sent electronically, a lot of them are still ending up op paper.
A.For
B.From
C.Although
D.By
中国市场学会于1984年成立于北京。()