20．At present, even selling newspapers and magazines will make a very good _____

　　　 A．benefit　 　　　　　　 B．bonus 　　　　　　　　 C．interest 　　　　　　　 D．profit　

19．Honesty seems never to be rather _____ today.

　　　 A．of a discount　　　 B．in a discount　　　　 C．at a discount　　　　 D．with a discount