Geography

　　The gradient（坡度）of the trip will reduce your range．A basic rule is that for every 100 metres of altitude you climb, you should add an extra 15 minutes to your journey time．In hilly or mountainous areas, the easiest routes for cycling are downstream along major rivers, as overall they will be downhill．A long, roundabout route along a river will usually be easier than a short, direct route over a hill or mountain pass．However, it is worth bearing in mind that the most scenic routes often come from hilly terrain．

　　Eat

　　Food choice depends largely on where you are, so see the respective sections for more information about foods. As you will be working hard, it's important to get enough energy in your

　　food. On long trips away from major towns-there may be little quality food available, so be prepared to live on candy bars, prepared meat products and the like if the need arises.

　　Sleep

　　While you can take a tent with you, many hotels and especially campsites can accommodate cyclists. However, there are also some hotels that may be less used to accommodating cyclists.If you are exploring an unfamiliar world, asking about the accommodation spares you the search for a new place to stay after a long exhausting day of travel.

　　31．Which distance does the author suggest to ordinary cyclists a day?

　　A．50km.

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