单项选择题
A.are more convenient than cars B.are safer traffic tools than cars C.are ridden by most people in U.S. D.are the solution to some city problems
A.Traffic Crowding in New York City B.Air Pollution in New York City by Cars C.Special Lanes for Passengers D.A Solution to Traffic Problems in New York
A.the city government B.some bike riders C.people living far from downtown D.some store owners