题目内容：

    Icebike is a term used for winter bicycling? particularly in snowy or icy conditions on roads or tracks. It can also refer specifically to ice bike racing. 1. While special equipment is available for icebiking, less extreme versions of the sport are often undertaken on normal bicycles.

Biking during the winter can generally be referred to as icebike. Ideal weather conditions typically range from cool and rainy, to cold and dry, to cold and snowy or icy. 2. Cyclists may choose to bike during the winter for a variety of reasons? including commuting（通勤），exercise or simply for fun. The types and amounts of special equipment required for winter cycling vary by climate conditions and whether the biking is done primarily on roads or on tracks.

In milder winter conditions? a regular road or mountain bike is often enough for icebiking. For snowy or icy roads and tracks, special tires may be necessary. Icebikers may use tires with screws（螺丝）inserted from the inside. 3.

Other equipment may be necessary for winter cycling whether or not there is snow and ice. Fenders（挡泥板）can prevent water or snow from being thrown up onto a cyclist. 4.They are of particular importance during the winter since it is dark during a larger part of the day.

5. Gloves, shoes and socks are of particular importance for icebikers. Cyclists may use regular gloves. Regular bike shoes? winter bike shoes or winter boots may be used for cycling, depending on climate and the biker's preference. In general? clothing guidelines for icebiking are similar to those for other winter sports.

A.Biking at any time is possible.

B.Bike lights are required for cycling after dark.

C.A cyclist must have a good knowledge of icebike.

D.Icebike can also refer to either road biking or track biking.

E.Appropriate clothing for outdoor winter exercise is important.

F.Other options for wintery tires include tire chains and tire wires.

G.In this condition race courses are marked out on solid sheets of ice.