1. Composition: Display words on white paper

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The following two articles are acceptable. Just change the name of the second article:

1 "Ding Ding Ding Ling" the class bell rang, and our classroom immediately became quiet. I saw Teacher Xu walking into the classroom with a smile and holding a lot of things. We looked at what Teacher Xu was holding curiously, and everyone was talking about it. The teacher asked us mysteriously: "Has any of you ever seen a piece of white paper that can reveal words? We looked at each other, and everyone said they had never seen it before. Then everyone started talking again. Some students said: "A piece of white paper can reveal words. Words are such a strange thing? Some students said: "It seems that Teacher Xu doesn't know what experiment to do again?" "... Seeing everyone's eyes shining with curiosity, the teacher asked: "Do you want to see this experiment? ""think! "Everyone said in unison. Teacher Xu put an alcohol lamp, a writing brush, a piece of white paper and milk on the podium respectively. The teacher first flattened the paper, then took a writing brush and dipped it into the milk in the measuring cup. , and then wrote four big characters on the white paper. When the paper was dry, Teacher Xu raised the white paper and asked, "Can't you see the words on it?" "Can't see!" "We said.

At this time, Teacher Xu lit the alcohol lamp and took the white paper and baked it back and forth on the alcohol lamp. The blue flames danced and danced under the snow-white paper, After a while, Teacher Xu raised the white paper, and ah! Four big yellow characters appeared on the white paper - "Love Science". What was going on? Everyone stared at it curiously. Teacher Xu.

Seeing that our monk Zhang Er was confused, Teacher Xu revealed the secret. It turned out that when writing on white paper with milk, the words could not be read after it was dried, but it could be dried with fire. After roasting, the milk is burnt, so the words written in milk appear.

It turns out that science is so amazing and interesting!

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2 Today, my friends and I are going to do a small experiment called "Displaying Words on White Paper". Why do we do this experiment? It turns out that I learned from a good friend that using white paper is a good idea. Paper can also display characters. Why can white paper display characters? In order to solve the mystery in our hearts, I found the tools for the experiment at home, including milk, brushes, plates, candles, matches and a piece of white paper. .

The experiment began. I poured the milk into the plate and then dipped the brush into the milk. Then, Wang Fang picked up the brush and frowned. What was the reason? I don’t know what to write. After a while, Wang Fang wrote a vigorous and powerful word "Fang" on the white paper. Then Yuanyuan picked up the match. , the candle was lit. When it was lit, the fire was very small, so we had to wait until the fire became stronger to display the words on the white paper. The candle oil dripped up drop by drop, as if urging us to hurry up and display the words. I was already waiting impatiently, so I quickly put the white paper with the word "Fang" written on it on the fire. After a while, a black and powerful word "Fang" appeared on the white paper. I saw that the experiment was successful. I couldn't help but applaud and cheer with my friends. My friends and I were very happy because the experiment was successful!

Although the experiment was successful, there was still one problem. But it has never been solved, that is: after writing words on white paper with milk and roasting it with fire, why can the words be revealed?

Finally, I found the answer from a book. It turns out? The reason is: milk is an organic substance. After writing on paper with milk, although it cannot be seen, when it is roasted by fire, the place where the writing was written on milk will turn into charcoal, so the words will be visible. < /p>

I love doing experiments, and I love science even more. 2. A 400-word composition written on a white paper.

Students, do you see the words on this white paper? In class, Teacher Miao held up a large piece of white paper and asked kindly: "Is it really true?" Teacher Miao asked mysteriously. "No, really not," we replied again. "Okay, then let the experiment tell you whether there are words on this paper!"

After saying this, Teacher Miao took out an alcohol lamp from a box and pulled out the alcohol lamp's Then he took out a lighter and carefully prepared to light it. The teacher protected the alcohol lamp with his hand to block the cold wind blowing from outside the door, and said anxiously: "Quick, quick, close the doors and windows!" We hurried to close the doors and windows. As soon as the door and window were closed, a "click" was heard, and a stream of light blue flames burst out from the hole in the lighter. The flames jumped like a naughty child dancing "disco". The flame slowly approached the alcohol lamp and lit the wick of the alcohol lamp.

After Teacher Miao lit the alcohol lamp, he picked up the big white paper, placed it on top of the wick of the alcohol lamp, and let the fire bake it. In order to prevent the paper from being burned, the teacher moved the paper evenly at all times. After roasting for a few minutes, a scent filled the classroom

With my open nose, I first said: "It's the scent of roasted milk!" "Yes, that's right! The transparent words are The teacher wrote it with milk!" After saying this, Teacher Miao put the lid on the alcohol lamp to put out the flame. Then he raised the heavy paper and said to us: "Look, what is written on it?" "I wish you happiness." We said in unison.

"Okay, the teacher will ask a few students to come up and do experiments on their own." "I'll do it, I'll do it------" the students rushed to say. "------Okay! Classmate Chen Zhiyu." Wow, the teacher called me first! I hope the flames don't burn my hands. I thought to myself. However, I was still too curious, so I walked up to the podium excitedly.

When I got to the podium, the teacher first prepared "paint", brushes and white paper for me. Then I lit the alcohol lamp again and waited for me to get the paper to bake. I picked up the brush, dipped it in some milk, and wrote a sentence. After I finished writing, I picked up the paper and baked it seriously like the teacher. After baking for a while, I suddenly heard the laughter of the teacher and classmates, and I asked: "What is so funny? Tell me too." "Look, alcohol lamp!" said a classmate. I looked down and saw, ah! It turned out that the flame of the alcohol lamp was extinguished by my paper.

Teacher Miao then lit the wick of the alcohol lamp again and asked me to bake again. I baked it for a while, and the words slowly appeared on the paper. I said happily: "Great, look, there are words!" But when I just wanted to show off, God was unfair. The paper suddenly burst into flames, leaving nothing behind.

Although I failed this experiment, I still feel very happy because, in this class, I learned the secret of displaying words on white paper.

3. What to write in a 400-word essay

Spring Rain

The spring rain is pouring down, and it falls from the sky with joy and harvest. The raindrops wet the flowers, plants and trees, giving the plants sufficient moisture. , the flowers, plants and trees sucked the nectar desperately, and sucked the nectar happily.

Listen, drip, drip, drip. That is the sound of spring rain, drip, drip. That is the sound of spring, drip, drip. It is the call of spring.

The raindrops are transparent, so thin, so small, and so light, as if they are tears from the sky, tears when the sky is excited. It has received the will of God and brought Human happiness and joy.

When I was a child, I often heard adults say: "Spring rain is as precious as oil." It is true. The silent spring rain falls so little, but it can bring the breath of spring to the earth. , the hope of spring.

The spring rain washes away the dust. The place it passes is so fresh and the air is so fresh. "Good rain knows the season, and spring will happen." The gentle rain brings mankind How much new hope. The spring rain washes the earth clean.

The spring rain is still falling, pattering. I love the gentle spring rain.