in Dr. BAum's opinion, A truE nAturE rEsErvE shoulD _______.
A．BE FAr AwAy From urBAn-CrowDEDnEss
B．prEvEnt whAtEvEr tourists to visit
C．BE rEgArDED As A plACE whErE nAturE is protECtED
D．proviDE BuilDings For humAn ACtivitiEs