If I were a scientist, I would write a composition! 450 to 500 words. . Urgent. . .

I'll provide you with several articles for you to choose from:

Scientists are so clever that I really want to be a scientist.

If I were a scientist, the first thing I would invent would be an automated house. If there is a flood, the automatic house can be automatically moved to a safe place. Migrants from the Three Gorges of the Yangtze River don't have to leave their homes like this, but they can also save a lot of money for the country!

If I were a scientist, the second thing I would do was to invent many automatic war robots. With it, we China people don't have to be afraid of being invaded by world powers. At the same time, let Americans see what China can do and kill his arrogance.

If I were a scientist, the third thing I would do would be to invent a TV that is more advanced than a computer. With it, as long as I say what I want to watch, the TV will play automatically, without buttons or switches. This brings a lot of convenience to people. Let the children immerse themselves in the colorful fairy tale world all day.

If I were a scientist, I would also invent a hemp switch. Because of it, we can keep all thieves out. Give them a taste of being electrocuted. Besides, only the owner can open this door.

Suddenly, my mother woke me up from my dream. So this is a dream! However, when I grow up, I must become a real scientist and invent many things to realize my dream.

In our happy childhood, we often love fantasy. Some fantasize about being a rich man with great wealth, some fantasize about being a respected mayor, and some fantasize about being a doctor who can eliminate people's diseases, but I want to be a scientist who benefits the people.

If I were a scientist, I would invent a kind of magic clothes. This kind of clothes will make you feel cool in summer and warm in winter, so people don't have to worry about adding or subtracting clothes because of the changes of the four seasons. This kind of clothes also has magical disease-resistant function. You don't have to worry about getting sick when you put it on, because this kind of clothes has a good disease-resistant effect, and ordinary people won't get sick.

If I were a scientist, I would make a magical machine. This machine can eliminate natural disasters such as tsunami, earthquake and volcanic eruption. Where there is a volcanic eruption, just throw it down and don't be afraid in the future. Because this machine sealed the crater, the lava in the volcano could not erupt. Send it to the bottom of the sea, it will seal the land on the bottom of the sea, the earth will not move and there will be no tsunami.

If I were a scientist, I would develop a needle that can cure all diseases, even diseases that doctors in the world can't cure now. Because it releases cells that can kill all viruses, as long as everyone injects a needle, it can play a preventive role.

Although I can't realize this wish now, I believe that as long as I study hard now and develop well when I grow up, this wish will come true naturally.

If I were a scientist, I would definitely use what I have learned to benefit mankind, and work hard for the happiness of our mankind like many countries in the world.

First of all, I want to invent an intelligent authenticity instrument. Nowadays, there are many fake and shoddy products, which infringe everyone's interests and some even endanger people's lives. For example, in the first half of last year, there was a "big-headed doll" incident in our country, which was harmed by fake milk powder. Those dolls that parents regard as "the apple of their eyes" and "the darling of their hearts" have become "strange" dolls because of eating inferior milk powder, which is really heartbreaking. Now I have my intelligent authenticity meter, no matter what product, as long as I touch it, it will immediately tell you the quality, safety and hygiene of this product. Fake and shoddy products are exposed to the intelligent authenticity tester. In this way, people will never be infringed by fake and shoddy products again, and they can shop with confidence and live happily.

I also want to invent the earth cleaner. With the rapid development of the world economy, people's living standards have been greatly improved. However, the problem of environmental pollution is becoming more and more serious. The climate becomes abnormal, the temperature rises year by year, typhoons keep coming, the ozone hole appears over Antarctica, and the SARS virus is rampant ... all these are the consequences of our human destruction of the environment. Now, as long as I use my earth cleaner, in an instant, I can remove garbage, make the air fresh, make the rivers green and clear, and make the earth rejuvenate again. I also want to invent a time-space reminiscer, through which we can see everything that happened before, which will bring good news to our archaeologists.

I also want to invent ...

I believe that as long as we study hard, love science and be brave in innovation, we will certainly realize our dreams. As a great man said, "Today's world is yesterday's dream, and today's dream will be tomorrow's world".

Let's work hard for our dreams!

If I were a scientist, I would invent a machine to make cigarettes disappear completely in this world, because I hate cigarettes, which take away my grandfather's voice.

In the past, as long as I walked to the door, I could smell a smoke coming out of the door before I entered the room. I don't need to look to know that grandpa must be smoking in the room again. So, I held my breath and opened the door. Sure enough, I saw my grandfather with a cigarette in his mouth.

One morning, when I got up, I didn't see my grandpa, so I thought, why did grandpa sleep late today? I walked into my grandfather's room and saw, hey, he's not in the room either. At this time, my grandmother came over and said to me sadly, "Grandpa was seriously ill in the middle of the night and was taken to the hospital by an ambulance ..." Speaking of this, my grandmother's eyes were red. "How did this happen?" I shouted in surprise. "I'm going to the hospital to see my grandfather!" . When I arrived at the hospital, I saw my parents looking at my grandfather sadly. I hurried to grandpa's bedside and asked, "Grandpa, how are you?" Is it better? "Grandpa looked at me, nodded and said nothing. At this time, my mother pulled me out of the ward and whispered to me in the corridor, "Grandpa is sick now because he smokes too much." The doctor said that his throat must be completely removed, and grandpa can't talk any more ... "My mother burst into tears. I was shocked and tears welled up in my eyes. In those days, the whole family lost their joy and the whole family was full of sadness.

From then on, I hated cigarettes, which made my dear grandfather lose his voice and never dared to call my name again. So I hope to invent a machine when I grow up, so that cigarettes can be completely extinct in this world and the tragedy like grandpa will never happen again.