阅读短文并回答以下问题 Self-service Ticket on Beijing Metro Using ticket vending machine (TVM) in every subway station can avoid long queues and reduce staff ’ s workload. Some passengers are often confused to operate the machine. So, as a station officer , you are ready to show passengers the whole process. Instruction for Single Journey Ticket (One single ticket per person, valid only on the day of issue at the station of purchase. ) 1.Select the station /the number of tickets. 2. Insert the coins or cash of 5 or 10 Yuan. (The ticket office is available for coin exchange.) 3. Click the confirmation button. 4. Take tickets and change. Instruction for Charging 1. Click the add value button. 2. Insert store value card. 3. Insert banknote. 4. Click the confirmation button. 5. Take out store value card. Ticket Information A passenger can use the automatic analyzer inside metro stations to check the information on his/her single-journey ticket, such as ticket fare, validity, and other details. 1.What’s the advantage of ticket vending machine ? 2.How to help a passenger buy a metro ticket through ticket vending machine? 3.How to help a passenger charge a store value card? ‍