Einstein has to speak at an important science meeting.  On the way there, he tells his driver that looksa bit like him, "I'm sick of all these meetings. I always say the same thingsover and over!"

The driver agrees, "You're right. As your driver, I attendall of them, and even though I don't know anything about science, I could give thespeech in your place. "

"That's a great idea!" says Einstein. "Let's exchangeour places then!"

So they exchange clothes. As soon as they arrive, the driverdressed as Einstein goes on stage and starts giving the usual speech, while thereal Einstein, dressed as the car driver, attends it.

But in the crowd, there is one scientist who wants to show offand thinks of a very difficult question to ask Einstein, hoping he won't be ableto answer. So this guy stands up and cuts in the speech by raising his very difficultquestion. The whole room goes silent, holding their breath, waiting for the answer.

The driver looks at him, dead in the eye, and says, "Sir,your question is so easy that I'm going to let my driver answer it for me."

Do you know about Sally? She's good-looking and well-spoken, but also is obedient(听话的). That's to say, she'll do anything that you ask her to do. Sally is a personal assistant robot. Bill Moir. a university teacher and computer engineer, spent more than a year finishing this robot. And now Sally can do many things, such as turning on the radio, and even playing and working on computers.

In other parts of the world, there are similar robots,but Bill's is to help disabled (残疾的) people around the home.

About one month ago, Bill said, "I'll make a special house. When you come in, Sally will be there on the big screen for you. You can ask her to read your e-mails, tell you the news and how the weather is. You can also askher to help you buy something you need.She'll be able to do many other things if you like."

Although Sally is a robot, it seems that she could do a better job than a human helper.

Bill's working on a new project (项目) now. He wants to improve Sally so that she can do more and better work for people.

Since last year, short videos have become popular online. Many people make and share short videos on popular video apps like Tik Tok and Kuaishou . On these popular apps, you can even add music and special effects to your videos. A video usually lasts 15 seconds to a few minutes. It shows people's daily activities like cooking, exercising and singing. So it can attract many people.

Teenagers enjoy these videos very much. More than 50 percent of junior high school students enjoy watching these short videos. About 47 percent of them have shared their own videos on Tik Tok, according to a recent report by the China National Youth Palace Association.

The videos let teenagers see a lot of funny and exciting things. Many teenagers like to share the fun things they do with others as well. For example, a student named Xiaogianyu has shared videos about her dancing. They make her win many fans.

However, the videos can also cause trouble. Some students watch short videos for too long and do not have enough time to study. Besides, there are some videos that are not appropriate for teenagers. They may learn bad things from them.

To solve these problems, Tik Tok added a new function in April. The app won't work if someone uses it for over two hours a day. In the same month, the government asked companies to control these apps and take out harmful videos. The apps have been checked and controlled more strictly since then, the Beijing News reported.

Tom: What's your plan tomorrow, Ann? 

Ann: I'll stay at home.{#blank#}1{#/blank#}

Tom: I will have a picnic in a park with some friends. 

Ann: {#blank#}2{#/blank#}

Tom: No. We'll go to Zhongshan Park.

Ann: Have you checked the weather report? 

Tom: Yes. It'll be sunny.{#blank#}3{#/blank#}

Ann: I'd love to, but I have to finish a school report. 

Tom: What a pity! {#blank#}4{#/blank#}

Ann: OK.{#blank#}5{#/blank#}

Tom: Thank you.