阅读理解。

     A lift is very useful. It looks like a small room. It goes up and down all day.Sometimes a worker

stands in the lift. He or she operates(操作)it up and down. In modern lifts there's no worker. People

walk in. They know which floor they want to go. They push a button(按钮)and the lift goes to that floor.

It's very fast and easy.

     Lifts are very important to us. Why? Think about a tall building. Maybe it has twenty floors. Maybe

it has fifty or more. Who can walk up all the stairs(楼梯)?Maybe people can climb them once. Can

someone climb thirty floors to an office every day? Can small children walk up to their rooms on the

twenty-fourth floor? Can their mothers or fathers carry food up to all those stairs? Of course not.

     We can have very high buildings because we have lifts. We could not have all the beautiful tall buildings without lifts. Because it is too tired for people to climb the stairs every day.

根据短文内容，回答下列问题。

1. What is a lift like?   

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2. What does a worker do when he or she stands in the lift?

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3. Can small children walk up to their rooms on the twenty-fourth floor?

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4. Why do we have many high buildings?   

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5. Can you give a title for the passage?   

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