The road lay ahead of him, as a ______ grey line stretching to the horizon.

A．all the attendants agree on the essense to boost international cooperation and information exchange against criminality
B．the attendants have found out a way Interpol can support polices in all countries around the world
C．the attendants make an agreement on building a global databases and international communication system
D．the attendants develop a new generation of communication equipment for all the countries

A．nature and science
B．humanities and societies
C．computer and technology
D．police and legality