Boys and girls, let’s do an experiment（实验）in today’s lesson.

Materials:

Instructions:

1.Fill the bowl or glass about 2/3 full with water.

2.Drop the egg carefully into the bowl and watch it going down towards the bottom.

3.Take the egg out and add about 5 spoons of salt. Test to see if your egg goes up.

4.Add more salt if the egg is still at the bottom.

The science behind it:

Things go down in the water when they are denser than the water, by adding salt we make the water denser. Once the water is denser than the egg, it goes up.

You can also try other things to see if you can have the same result.

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D．

The class was right in the middle of a math problem. Suddenly, Joe laughed out loud at the back of the classroom. Everyone stopped and looked at him.

“What are you laughing at?” Mr. Steinman.

“Nothing.” Joe answered.

“Joe. Office. Now,” Mr. Steinman became angry.

“Fine, I’d rather be there anyway.” Joe said.

“I’ll be calling home after school, too,” Mr. Steinman said.

“Ask my mom to buy pizza for dinner when you call,” Joe suggested.

His teacher opened his mouth to reply, but thought better of it. Instead, he continued the maths lesson. Joe took his time to get to the door. He stopped to sharpen his pencil.

“Joe! Get out now. You don’t need your pencil in the office,” Mr. Steinman said.

“I want to be prepared,” he tried to look confused, even though he knew what he was doing was wrong.

Joe left the classroom. Sadly, he didn’t know how to do his homework, which made him sigh (叹气). Then he arrived at the office and sat in his familiar chair, waiting to get shouted at again. Once he got home, he’d be in trouble with his parents, and tomorrow he’d repeat the whole process.

“Another day, another detention,” he sighed, wondering why maths was so hard. He made up his mind to work hard in maths, because he still wanted to be good at it.