quEstions 14 to 17 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.
whAt is thE mAin suBjECt oF thE tAlkA．how thErmogrAphiC photogrAphy wAs invEntED、
B．thE ADvAntAgEs oF x-rAys ovEr thErmogrAphy.
C．sCiEntiFiC photogrAphy For DiAgnostiC purposEs.
D．sEvErAl nEw tEChniquEs For rEDuCing pAin.