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第60页

信息发布者：

Building

became

through

brought

There are a lot of changes in our life. Then, if we wanted to buy something, we had to go to shops.

We always had lessons in the classroom. And we used the keys to open the doors. Now we can do shopping

on the Internet. We can have lessons on the Internet too. And we have electronic locks. We can open the

doors with our fingerprints.