whAt ArE thE "unusuAl trAits or situAtions" rEFErrED to in thE First sEntEnCE
A．pAttErns oF AnimAls AnD plAnt growth.
B．FooD AnD FooD prEpArAtion pAttErns oF thE uplAnD tiBEtAns.
C．soCiAl AnD FAmiliAl orgAnizAtion oF typiCAl tiBEtAn soCiEty.
D．ExtrAorDinAry physiCAl ChArACtEristiCs AnD thE CulturEs.