A、Frame. B、Handlebars. C、Seat. D、Wheels. A文中在建议如何挑选自行车时指出，框架是自行车的主要构造．要买力所能及的最好的，故选A)项。

It can be shown in facts and figures that cycling is the cheapest, most convenient, and most environmentally desirable form of transport in towns, but such cold calculations do not mean much on a frosty winter morning.(32)The real appeal of cycling is that it is so enjoyable. It has none of the difficulties and tensions of other ways of travelling, so you are more cheerful after a ride, even through the rush hour.
    The first thing a non-cyclist says to you is: "But isn’t it terribly dangerous?" It would be foolish to deny the danger of sharing the road with motor vehicles and it must be admitted that there are an alarming number of accidents involving cyclists.(33)However, although police records indicate that the car driver is often to blame, the answer lies with the cyclist. It is possible to ride in such a way as to reduce risks to a minimum.
    If you decided to join the thousands in Britain who are now returning to cycling as a cheap, satisfying form of transport, your first problem will be trying to decide what bike to buy. Here are three simple rules for buying a bike:
    1. Always buy the best you can afford.
    2.(34)Get the best frame, the main structure of the bicycle, for your money as you can.
    3. The fit is vital.(35)Handlebars and seat height can be adjusted but you must get the right sized frame. On the whole it is best to get the largest size you can manage.
32. Q: According to the speaker, what is the real appeal’of cycling?
33. Q: What shall we do in face of an alarming number of road accidents involving bicycles?
34. Q: According to the article, what part should be considerd seriously when buying a bike?
35. Q: What should we do to ensure that a bicycle fits for us?