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Recent years have witnessed the returning of bikes across China. An increasing number of people choose cycling instead of driving to school,to workplaces or to do sightseeing. Bike-sharing plans are warmly welcomed in many cities. Mobike had 5. 85 million active users while ofo had 1. 4 million in the first week of this year.

People can unlock the shared bikes by simply using their smartphones. All bikes have GPS and can be left anywhere in public for the next user. They're popular among many Chinese people because they help solve “last-mile” problems in cities. For example,many people find it difficult to get to the hotel when they get off trains or to travel around the city.

However,the plans have also led to problems such as illegal（非法的）parking,vandalism（故意破坏）and theft. In February,two nurses in Beijing were placed under administrative detention（行政拘留）for five days for putting locks on two shared bikes.

In fact,these problems are also shared by bike-sharing plans abroad. Started in 2007,Vélib is the largest public bike sharing system in Paris. At its early period,it also met with problems of vandalism or theft. To deal with these problems,the company came up with the idea of encouraging people to return the bikes to stations by rewarding free time for their next rides.

Now,Chinese service organizations are also trying to deal with these problems. For example,Mobike sets a 100-pwint credit score（信用分教）for each user,but the points will be taken because of his or her bad behavior. Once a score drops below 80,bike rental（租金）will be increased from I yuan to 100 yuan per 30 minutes.

【小题1】What do many people choose to go to school or work instead of driving?
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【小题2】How do people unlock the shared bikes?
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【小题3】Why are the shared bikes popular in cities?
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【小题4】What reward will people get if they return Vélib bikes to Stations?
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【小题5】According to Mobike, how will a rider be punished if his or her credit score drops below 80?
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