B.manpower and natural resources control.

　　C.ownership of productive resources

　　D.free contracts and prices.

　　5.The passage is mainly talking about ___.

　　A.how American goods are produced.

　　B.how American consumers buy their goods.

　　C.how American economic system works.

　　D.how American businessman make their profits.

　　第24篇答案：DDCAC