in sECtionsA,B、AnDC、you will hEAr EvErything onCE only. listEn CArEFully AnD thEn AnswEr thE quEstions thAt Follow.
{{B}}sECtionA、tAlk{{/B}}
quEstions 1 to 5 rEFEr to thE tAlk in this sECtion.At thE EnD oF thE tAlk you will BE givEn 15 sEConDs to AnswEr EACh oF thE Following FivE quEstions. now listEn to thE tAlk.
onE oF thE mEChAniCAl solutions to CAr pollution isA．to ChAngE thE ChEmiCAl struCturE oF FuEl.
B．to improvE on thE ExhAust pipE.
C．to ExpErimEnt with nEw EnginEs.
D．to monitor thE Amount oF ChEmiCAls.