Thirty years ago, most teenagers 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 (64) those under 16 are not allowed to have them. (65) , greater freedom brings danger because speed encourages young people to take risks and as a result scooters are involved (66) more accidents, and the accidents are
A. for
B. in
C. at
D. to
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