whAt is thE mAin iDEA oF thE pAssAgE
A．thE tElEphonE hAs hElpED to sAvE pEoplE From illnEss AnD FirE.
B．thE tElEphonE hAs hElpED to prEvEnt wArs AnD ConFliCts.
C．thE tElEphonE hAs mADE thE moDErn oily nEithEr BEttEr nor worsE .
[D) thE tElEphonE hAs hAD positivE As wEll As nEgAtivE EFFECts on us.