46. B【解析】细节理解题。根据第一段句子＂Bike-sharing has swept across China, with an increasing number of people choosing bike riding instead of driving.＂共享单车席卷中国，越来越多的人选择骑自行车而不是开车。可知第一段告诉我们共享单车正变得越来越流行。故选B。

　　47. B【解析】细节理解题。根据文中句子＂It’s very convenient to use the bikes if you have a smart phone. First, you have to download such an APP on your smart phone.＂（如果你有智能手机，使用自行车非常方便。首先，你必须在智能手机上下载这样的应用程序。）可知，如果你想使用共享单车，你必须先有一个智能手机并下载一个应用程序。答案为B。

　　48. C【解析】词义猜测题。上文提到有些人把自行车停在自己家里。结合下文中的句子＂Now service companies are trying to solve the problem like being stolen.＂（现在服务公司正试图解决这个问题，比如被盗。）可以猜测value的意思是＂爱惜＂，有些人不爱惜自行车。答案为C。

　　49. A【解析】细节理解题。根据文中句子＂The bike that the service company provides has GPS or Bluetooth on it. And those bikes can be easily unlocked with a smart phone and left anywhere in public.＂可知，共享单车很容易解锁；根据＂Now service companies are trying to solve the problem like being stolen.＂可知，共享自行车可能会被盗；根据＂The cost of riding depends on the time that you spend. Normally, every hour you ride, you need to pay one yuan. It doesn’t cost so much, does it?＂可知，使用共享单车比较便宜；A. Bike-sharing is a kind of expensive transport. 自行车共享是一种昂贵的交通工具。文章没有提及，故答案为A。

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