假定你是红星中学学生李华。你的美国朋友Jim在给你的邮件中提到他对中国新近出现的一种共享单车 mobike 很感兴趣，并请你做个简要介绍。请你给Jim回信，内容包括：
1. 这种单车的使用方法（如：APP查看车辆、扫码开锁等）；
2. 这种单车的优势；
3. 你对这种单车的看法。
注意：1. 词数不少于80;
2. 开头和结尾已给出，不计入总词数。
提示词：智能手机 smartphone, 二维码 the QR code
★ 范文
Dear Jim,
I m writing to tell you more about the new form of sharing bike--mobike mentioned in your latest letter.
It s very convenient to use if you have a smartphone. What you do is to find a nearest mobike through the APP, scan the QR code on the bike, and enjoy your trip.
Compared to other forms of sharing bike, the greatest advantage of mobike is that you can easily find one and never worry about where to park it. It is becoming a new trend as a means of transportation, which relieves the traffic pressure and does good to the environment as well.
Hope to ride a mobike with you in China.
Yours,
Li Hua
