2．Tips for Cycle TripsCycling has many advantages as a form of travel，as it is the fastest way to travel by human power，and slow enough to allow the type of local involvement that is impossible with powered travel．Cycle travel is a cheap form of transportation．
Distance
On level terrain（地形），without a headwind，a cyclist of average fitness on a touringbike can comfortably cover 60-120km a day．Distances of up to 250km a day are possible，but anything much beyond 120km will require considerable physical tension and not allow many stops to enjoy the places you visit．For many，80-100km a day will be the most suitable distance to aim for，as it will give a sense of achievement and also leave plenty of time for meals and activities．
Geography
The gradient（坡度）of the trip will reduce your range．A basic rule is that for every 100metres of altitude you climb，you should add an extra 15minutes 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 word，asking about the accommodation spares you the search for a new place to stay after a long exhausting day of travel．
21．Which of the following distance does the author suggest to ordinary cyclists a day？B
A．50km．
B．90km．
C．130km．
D．250km．
22．Form the passage，we can learn thatC．
A．high quality food is easy to get on long trips
B．hotels seldom provide accommodation for cyclists
C．cycling over a mountain is challenging but worthy
D．it takes cyclists 15minutes to climb 100m of altitude
23．We can probably read this passage inD．
A．a geography book
B．a research report
C．a science fiction
D．a travel magazine．
分析 本文介绍骑车旅行，旅行距离，地理位置及过程中的饮食和睡觉的注意事项．
解答 21．B 细节理解题．根据第二段提到On level terrain（地形），without a headwind，a cyclist of average fitness on a touring bike can comfortably cover 60-120km a day．在一定的条件下，没有逆风的情况下，一个健康的骑车人的行程每天应在60到120之间，故选B项．
22．C 推理判断题．根据第三段提到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绕河的路线比绕山的路线简单，但绕山的风景是漂亮的，故选C项．
23．D 推理判断题．本文在讲到骑车旅行距离，地理位置，食物及睡觉的注意事宜，故在旅行杂志看到，所以选D项．
点评 考察学生的细节理解和推理判断能力，做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确的选择．在做推理判断题不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．
