A．It promotes sales.
B．It costs too much.
C．It doesn't work well.
D．It is easy to do.

A．We pay little attention to ad presentations.
B．We don't know the target customers well.
C．We exaggerate the effectiveness of products.
D．We make the ads boring and dull.

A．It must be simple enough to understand.
B．It should be creative and unique.
C．It should be shown in a inconspicuous way.
D．It is a chance to impress potential customers.