quEstions 22～25 ArE BAsED on thE Following tElEphonE intErviEw.

why wAs it nECEssAry to rEplACE thE olD stAnDArD wEightA．somEonE spillED wAtEr on it.
B．somEonE lost it.
C．it wAs mADE oF low-quAlity mEtAl.
D．thE stAnDArD For mEAsuring hAD ChAngED、