Questions 22 to 25 are based on the conversation you have just heard.

A．"affordable printers make it possible for anyone to forge documents
B．the American Secret Service will be able to trace any document
C．every printed document will be secretly marked out through high-tech
D．counterfeiters have more advanced technology to use

A．They are social marine animals.
B．They call for help when they are in danger.
C．They hunt food alone and independently.
D．They immigrant between the Antarctic and Australia.