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信息发布者：
In Los Angeles.
By touching the screen in front of them.
Four.
I'd like to order my food on a screen because I'm shy and I don't want to communicate with 
others./I'd like to order food with the help of the waiters because they can give me good 
advice.
       As we all know, great changes have taken place in China over the past years. People's
living conditions have improved a lot. The environment around us has become better. We are 
getting used to travelling by high-speed train because it's easy and fast. Online shopping has 
been more and more popular. Even my grandparents have learnt how to shop online. Among 
all the changes, I think mobile payment is the most surprising. Now we don't need to take paper 
money or wallets with us. We can pay for nearly anything with our phones. Isn't it amazing?
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