quEstions 29 AnD 30 ArE BAsED on thE Following nEws.At thE EnD oF thE nEws itEm, you will BE givEn 10 sEConDs to AnswEr thE quEstions. now, listEn to thE nEws.

whiCh oF thE Following stAtEmEnts isCorrECtA．only A smAll pArt oF thE twElFth-grADErs hAvE A BAsiC lEvEl oF unDErstAnDing oF EConomiCs.
B．thE stuDEnts DiD BEttEr in thE EConomiCs tEst thAn in history or sCiEnCE.
C．thE tEsts wErE givEn to thE univErsity stuDEnts.
D．47 pErCEnt oF thE high sChool grADuAtEs hAD tAkEn An EConomiCs ClAss.