阅读下列短文,从每题所给的四个选项(A、B、C、D)中,选出最佳选项,并填写在答题卡上。 Since last year, city streets around China have seen colorful shared bikes, which people can rent with a smartphone app and then park wherever they choose. To reduce traffic jams and air pollution, many cities have offered bike-sharing. But sometimes, dreams can turn sour(坏的). As shared bikes become more popular, problems keep showing up. According to news reports, shared bikes are badly treated by users. When people are using the bike, some of them just throw it onto streets and even into ditches(水沟). Some bikes are stolen. Recently, a man in Shanghai was fined 1,000 Yuan for stealing a shared bike. Besides, the damage to the QR codes on the bikes has brought huge losses to bike-sharing companies, like Mobike. If the QR code is damaged, the bike cannot be used any more. It can take several hundred Yuan for the company workers to find a lost bike and get it repaired. Mobike has 100 credit (信用) scores for each user. Penalty(处罚)points will be taken in case of users’ bad behaviors. Once the score drops to below 80, bike rental will go up to five Yuan per 30 minutes. However, punishment may not be the best way to stop shared bikes from being stolen or damaged. Bike-sharing services will work well only if people follow the rules and show respect for the bikes and other users.