[A] research[B] operation[C] movement[D] search

[A] operation [B] production [ C] procession [ D] action

A．A foreign language.B．Good diction.C．Switchboard operation skills.D．None of the above

A．In a research institute.B．On the beach.C．In a zoo.D．On the campus.

What does "identity" （Para. 2)refer to？A．Movement.B．Target.C．Enemy.D．Habitat.

Operation research is a scientific method of providing executive department with a quantit

_________[A] searching [B] strolling [C] crowding [D] wandering