A．SMS also sends rubbish short messages
B．SMS violates their privacy
C．SMS does not consider whether people need it or not
D．SMS doesn’t get people’s permission to send them messages

A．SMS doesn’t take measures to forbidden it
B．SMS doesn’t guarantee people’s privacy
C．it makes rubbish short messages transmission easier
D．it extends the scope and influence of rubbish short message

A．people should refuse rubbish short messages
B．SMS should think of a way to get rid of rubbish short messages
C．MMS should not allow people to send messages from the Internet to cell phones
D．SMS benefits from rubbish short messages