{{i}}quEstions 17 to 20 ArE BAsED on thE Following pAssAgE.At thE EnD oF thE pAssAgE, you will BE givEn 20 sEConDs to AnswEr thE quEstions. now listEn to thE pAssAgE.{{/i}} whAt DoEs thE pAssAgE mAinly tEll us
A、invEntion oF ChEwing gum.
B．ChEwing gum’s ContriBution to pEoplE’s hEAlth.
C、how wriglEy mADE ChEwing gum populAr in thE u.s.
D．ChEwing gum--A grEAt FAvoritE with thEAmEriCAn pEoplE.