解析：B。本文开门见山地提到wheel，点明了文章的主题。再综合后文的内容可知，全文讲述了车轮的发展历程以及道路设计对车轮发展的影响。

　　2. 倒三角形写作法

　　主题句出现在文尾，即先表述事实细节或论据，然后在结尾点出主题或结论。

　　例：

　　[2017年广东卷阅读理解B篇]

　　Some people think that success is only for those with talent or those who grow up in the right family, and others believe that success mostly comes down to luck. I’m not going to say luck, talent, and circumstances don’t come into play because they do. Some people are born into the right family while others are born with great intelligence, and that’s just the reality of how life is.

　　However, to succeed in life, one first needs to set a goal and then gradually make it more practical. And, in addition to that, in order to get really good at something, one needs to spend at least 10,000 hours studying and practising. To become great at certain things, it’ll require even more time, time that most people won’t put in.

　　…

　　Whatever you do, if you want to become great at it, you need to work day in and day out, almost to the point of addiction, and over a long period of time. If you’re not willing to put in the time and work, don’t expect to receive any rewards. Consistent, hard work won’t guarantee you the level of success you may want, but it will guarantee that you will become really good at whatever it is you put all that work into.

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