A) express C) imply
B) show D) mean

A．industrialized
B．commercial
C．competitive
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.