whAt is thE pAssAgE mAinly ABout
A．sCiEnCE tEAChErs to BAn tEsting hArmFul to AnimAls.
B．tEAChErs' poliCy ChAngE in ExpErimEnt on AnimAls.
C．thE nEw poliCiEs oF BAnning hArmFul ExpErimEnts to AnimAls.
D．thE importAnCE oF prohiBiting hArmFul ExpErimEnts on AnimAls.