A．The users' comment on medicine is not always reliable.
B．Ads of over-the-counter products are not allowed.
C．The claim of any positive cure for a disease is forbidden.
D．Most of the medicines need doctor's prescription.

A．Manufacturers don't like it.
B．Medical ads are not allowed to do it.
C．They can't afford the cost,
D．They can't make promises.

A．He doesn't consider much about custoraers.
B．He can't offer any practical way of promotion,
C．He doesn't deserve the promotion indeed,
D．He knows little about the regulations of ads.