单项选择题
A．imitate the people of the East B．keep their food clean C．impress visitors with their good manners D．amuse the English
A．the press B．television C．radio D．all of the above
A．businesses usually do not pay much for advertisement B．businessmen know well that advertisement could bring them more profits C．advertisement could hardly convince people of the value of the goods D．advertisement usually cost businesses large amounts of money