题目内容：

Bike-sharing schemes have been growing in popularity in China, with the total number of users between 2015 and 2016 jumping from 2.45 million to 18.86 million. 

Along with such rapid development, the risks and safety hazards（安全危害） associated with customer deposits and a low cost and low quality business model have both drawn much attention. 

Let’s take a look at some of the "gains and pains" of the emerging two-wheeled commercial services.

1.According to the passage, how many reasons of the rapid development of the bike-sharing?

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2.What percent of the shared bike users are aged 26~35?

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3.If a person wants to ride both Ofo and Mobike, how much money he should pay for guaranteed deposits?

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4.Do you use the shared bikes? What do you think of the shared bikes?

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5.Can you give some advice on solving the bike-sharing problems?

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