题目要求
共享单车（bicycle sharing）已成为时下最热的话题之一，请你就这一话题写一篇短文。内容须包括三方面：
1. 共享单车蓬勃发展，成为社会热潮；
2. 共享单车带来便利，但也存在问题；
3. 我对解决问题的建议。
参考范文 1
Bicycle Sharing
With the development of technology, bicycle sharing comes into people's lives.It becomes more and more popular and much news reported it.At the same time, we should see that there are some problems caused bybicycle sharing.
On one side, bicycle sharing makes it very convenient of people traveling.You can find a bicycle anywhere at any time when you want to go out for a cycling, and the price of one trip is very low.It cansave time forpeople. On the other side, its management is not perfect. Even kids can open the lock and ride the bicycle, there is no doubt thatsuch behavior is very dangerous.What's more, many people deliberately break it, like throw it to the river or destroy the code above it.
In my opinion, we should take a developing view about bicycle sharing.It is obviouslyhelpful to human beings as a high-tech product.The government should introduce relevant provisionstoregulatethis market to avoid its disadvantages.
参考范文 2 （较难
My Views on Bicycle-sharing
Presently, in big cities like Shanghai and Guangzhou, bicycle-sharing system has becomeincreasinglypopular.A large number of shared bikes can be found and rented at a low price.Moreover, you can park the bike almost anywhere you like.Urban transportationhas thus been made much more convenient and even revolutionized.However, along withits rapid development, bicycle-sharing system also brings some problems, including random parking, vandalism and possession of shared bikes, etc.To solve these problems, there are some measures forthe authorities to take.
Firstly, the government could implement more strict laws and rules to regulatethe operation and management of bicycle-sharing system.Secondly, the public should raise their awarenessof using shared bike reasonably.Lastly, urban transportation system should be upgraded and improved to accommodate automobiles, bikes and pedestrians.
To conclude, a sensible attitude should be held toward bicycle-sharing program.With effectiveand efficientmeasures taken, and efforts made by those involved,it can be expected that bicycle-sharing system will play a contributiveand constructive role in urban public transportation.