this pAssAgE is DEvotED to introDuCtion to ______.
A．thE CAusEs AnD EFFECts oF El nino wEAthEr phEnomEnA
B．thE worlDwiDE monitoring nEtwork sEt up to prEDiCt El nino
C．thE rElAtionship BEtwEEn thE oCEAn tEmpErAturEs AnD ClimAtE pAttErns
D．El nino phEnomEnA AnD DEstruCtivE EFFECts oF onE El nino EvEnt on iCA