A) industrialized C) competitive
B) commercial D) mobile

A．An important new role has evolved for good zoos: they are not prisons for animals but reservoirs of species.
B．Zoos should learn to justify their existence no matter how great the pressure is.
C．Criticism on zoos ought to be more specific because zoos are not graded on the same level.
D．The function of education of zoos becomes more important and practical.

A．Zoos play an important role in educating people about the conservation of wildlife and plants.
B．Zoos are a good device against species extinction.
C．Zoos valuable role in society is still an issue in debate.
D．Zoos are regularly visited by most city people.