National knowledge to know in the 6th grade of elementary school

Relevant laws and regulations, national geographic knowledge, know the symbols of the country and its significance, know the main characteristics of our capital and some important cities.

I read this cartoon in a comic book: In a big forest, a man with a cigarette in his mouth and a sharp axe is cutting down trees, and the trees are crying, and the man stops a woodpecker on his shoulder, and the woodpecker looks at the man's head and says, "There must be worms in this piece of wood."

I don't know if you understand the meaning of this cartoon, that person does have a "worm" in his head, but this worm is not another worm, this "worm" refers to the heart worm that destroys the ecological balance, no wonder the woodpecker said that he "has a worm in the head", but in our daily life, in the world, the number of such "worms in the head" is countless, but woodpeckers are very few.

Usually, many students' scratch paper is thrown into the trash after only a few strokes, you know, these papers are trees; When washing your hands, the water is boiled quite large, not to mention, after washing your hands, you don't turn off the water and leave, let the water flow, you must know how precious water is in arid areas; Usually, throwing garbage on the ground affects both the environment and the aesthetics. You know, our earth has been greatly damaged, but those who have "worms in their heads" have not woken up at all, and they destroy the environment for their own benefit: indiscriminately cutting down and destroying vegetation; In order to facilitate the discharge of sewage into the rivers, I don't know how many rivers are undrinkable, and our mother river, the Yellow River, has become muddy. The former land of abundance - Chengdu.

The beautiful scenery no longer exists, and the land is marching towards desertification; Air pollution is also getting worse, with acid rain almost everywhere. Before such a shocking event, humanity did not seem to have woken up, and the greedy worm in people's heads was getting bigger and bigger, and people were already captivated by desire.

Since the human footprints were involved, the animals have never had a peaceful day, and the Tibetan antelope, which used to be docile and free.

Exhausted from the pursuit of humans; The whales that once dominated the oceans are on the verge of extinction. I don't know how many creatures have been wiped out at the hands of the greedy bugs of the human brain, and have since died out in the long river of history.

Now we must protect our beautiful earth, because to save the earth is to save the future, and the first thing we should do is to destroy the greedy worm in our brains, students, please shine a light on you.

The nature of the state The ruling party The basic system The history of the classics The basic rights of citizens The concept of the people.

The length, width, and area of the rectangle are three quantities, and when the length is constant, the (area) and (width) are proportional;

When the area is constant, the length and width are proportional;