{{B}}quEstions 21—23 ArE BAsED on thE pAssAgE ABout vAnity stAmps. you now hAvE 15 sEConDs to rEAD quEstions 21—23.{{/B}}

why DiD jApAn print vAnity stAmpsA．BECAusE thE jApAnEsE likE tAking photogrAphs.
BECAusE thE jApAnEsE likE writing lEttErs to EACh othEr.
C．BECAusE thE jApAnEsE postAl oFFiCiAls wAnt to print A spECiAl stAmp to CAtCh worlDwiDE AttEntion.
D．BECAusE thE jApAnEsE postAl oFFiCiAls hopE thEsE sumps will hElp promotE intErEst in lEttEr-writing.