quEstions 21—23 ArE BAsED on thE pAssAgE ABout vAnity stAmps. you now hAvE 15 sEConDs to rEAD quEstions 21—23. why DiD jApAn print vAnity stAmpsA．BECAusE thE jApAnEsE likE tAking photogrAphs.
B、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.