{{B}}quEstions 15—18{{/B}}

A、A、tv wEAthEr progrAm on sEAsonAl ChAngEs.
B、An inFormAl DisCussion BEtwEEn FriEnDs.
C、An ACADEmiC spEECh At sChool.
D、A、FormAl prEsEntAtion At A ConFErEnCE.