填空题

The automobile has many advantages. Above all, it (36) people freedom to go where they want to go when they want to go there. To most people, cars are also personal (37) machines that serve as (38) of power, success,, speed, excitement, and (39) . In (40) , much of the world’ s economy is built on producing vehicles and supplying roads, services, and repairs of vehicles. Half of the world’ s paychecks are (41) . In spite of their advantages, motor vehicles have many harmful effects on human lives and on air, water, land and wildlife resources. Though we (42) to deny it, (43) in cars is one of the most dangerous things we do in our dally lives. Every year, (44) , and they injure or permanently disable ten million more. (45) . Motor vehicles are the largest sources of air pollution, producing a haze of smog over the world’s cities. (46) .