quEstions 18～21 ArE BAsED on thE Following DiAloguE.

juDging By thE ExtrAorDinAry wArm ClothEs somE pEoplE wEAr, whAt might wE lEArn ABout thEmA．thEy mAy BE homEsiCk AnD FEEl insECurE.
B．thEy ArE EithEr ColD or vEry siCk.
C．thEy mAy try to AttrACt othEr pEoplE’s AttEntion.
D．thEy wAnt to protECt thEmsElvEs From physiCAl injuriEs.