题目内容：

你在英国曼彻斯特的朋友Jim通过邮件告诉你，2017年夏天，中国的共享单车在英国登陆，受到了英国人极大的欢迎。请你回复一封邮件，简要介绍共享单车在天津的情况，并阐述共享单车的优点（不少于两点）和存在的问题（不少于一点），最终表明自己对共享单车的态度。

注意：（1）词数不少于100；

（2）开头和结尾已经给出，不计入总词数。

提示信息：（1）2017年天津共享单车接近100万辆；

（2）手机应用smartphone APP

（3）二维码the QR code

Dear Jim,

I am glad to hear that China’s shared bikes have lunched service in the UK and bike sharing has become new way of transport for you.

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Yours,

Li Jin