quEstions 23～25 ArE BAsED on thE Following nEws From thEBB
C、or thE voA、At thE EnD oF thE nEws itEm, you will BE givEn 15 sEConDs to AnswEr thE thrEE quEstions. now listEn to thE nEws.
thE sEArCh For A ChEAp AltErnAtivE FuEl hAs lEDAmEriCAn sCiEntists to stuDy thE potEntiAl oF ______.A．sunlight
B．purE hyDrogEn gAs
C、ponD wAtEr
D．smAll strEAm