企业家，是法国经济学家（）于1800年左右提出的概念。
A.科斯
B.萨伊
C.德鲁克
D.熊彼特
参考答案：B
单句改错.
1. Can't eat in the classrooms. ( )
A B C D
2. Do morning exercises everyday. ( )
3. Don't it like this. Do it like that. ( )
4. Don't is afraid. The dogs are friendly. ( )
5. He don't have to go home now. ( )
下表是16世纪开始的大西洋国际贸易中商品交换的主要种类。如果经由欧洲输出、再行交换或生产，最后将获利输入欧洲，其顺序应是（）
A.甲、乙、丙
B.甲、丙、乙
C.丙、甲、乙
D.丙、乙、甲
