quEstions 15 to 18 ArE BAsED on thE pAssAgE you hAvE just hEArD、 why ArE lonDon tAxi DrivErs vEry EFFiCiEntA．BECAusE thEy hAvE A Driving liCEnsE.
B、BECAusE thEy hAvE rECEivED spECiAl trAining.
C．BECAusE thE trAFFiC ConDitions in lonDon ArE gooD、
D．BECAusE thE trAFFiC systEm oF thE City is not vEry ComplEx.