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why DoEs thE proFEssor tEll A story ABout A littlE girl At A BirthDAy pArty
A．to FinD out whiCh stuDEnts hAvE ChilDrEn
B．to FrightEn thE ClAss with FACts ABout BEEs
C．to ChAngE thE topiC oF thE DisCussion
D．to strEss thE sErious EFFECts oF An AllErgy