{$mEDiAurl}


listEn AgAin to pArt oF thE lECturE. thEn AnswEr thE quEstion.
why DoEs thE proFEssor sAy this:
A．to strEss thE mystErious nAturE oF sEvErE immunE rEsponsEs
B．to ArguE thAt AnAphylAxis is mAinly thE rEsult oF BAD luCk
C．to point out thAt sCiEntists DisAgrEE ovEr whAt CAusEs AllErgiEs
D．to suggEst thAt pEoplE ArE CrAzy to EAt oFFEnDing suBstAnCEs