A．They insert advertisements when the movies are near the most appealing part.
B．They give actors free lifetime supply of cigarettes and ask them to smoke in the movies.
C．They promote their products by giving cigarettes as gifts to the viewers before the movies start.
D．They sponsor the moviemakers on the condition that the actors use their products.

A．To collect taxes.
B．To save public lands for future use.
C．To protect people and property.
D．To train public officials.