Thirty years ago, most agers had bicycles, but now they are comparatively rare.____56___,motor scooters (小型摩托车) are much more common.____57___, this may seem to be a sign of progress but____58___the change is not necessarily for the better.
It is easy to see why young people prefer scooters.____59___, they are much faster and do not require much physical effort,____60___, you can take a passenger with you on the pillion（后座）seat behind;____61___,they give young people a feeling of independence, because they can travel further and impress their friends.____62___, the disadvantages are equally obvious.____63___first sight, scooters are more expensive to buy and to maintain, and_______those under 16 are not allowed to have them.____65___, greater brings er because speed encourages young people to take risks and as a result scooters are involved____66___more accidents, and the accidents are____67___more serious.
Bicycles are safer and easier to control.Years ago, agers had more experience with them because they____68___to ride as young children, and consequently knew what they were capable of.____69___, many young people overestimate what a scooter can do and pretend it has the power of a motorcycle.____70___, the fact is that bicycles are not very safe____71___.in cities these days because there are more cars and drivers are not used to them and do not make allowances for them.
____72___, those who are old enough to ride scooters naturally prefer them. Those who are too young or cannot afford to buy a scooter probably 6nd bicycles slow and uncomfortable____73___,and riding bicycles requires____74___experience of traffic than before. On balance, the change has been for the worse,____75___for the 13-and 14-year-olds, but the only safe solution would be to have special lanes（车道） for cyclists.

73 A.or rather B.by comparison

C.in contrast D.after all