题目

A.     The success story wastraced back to the 1960s, when Vancouver decided not to build highways. B.     Today, around 50 percentof journeys in Vancouver are made through sustainable means. C.     Vancouver now boasts some of the lowestcarbon emissions in the world. D.     Tree planting proves aneffective way in reducing the emission of carbon. E.     The city planner knewthat green transportation had to be a big part of the solution. F.     Carbon dioxide is themajor source of air pollution in big cities in Canada. In many big cities around, gas-powered vehicles arJohn can play 　　　 football and I can play 　　　 pipa. ( )A. /; theB. the; theC. the; /