Urgent need!!! Kneel and beg for 6th grade science review materials for new textbooks

1 False 2 False 3 to 4 1 Wrap the energized wire around the electromagnet, place the compass in the middle of or next to the two magnetic poles, and judge the magnetic poles of the electromagnet according to the pointing of the compass 2 Electrical energy is converted into light energy, mechanical energy .........

1.Wrong. 2.Wrong.

3.Right. 4.Right.

1.Connect the two ends of the wire to the two poles of the battery, and place the tip of the nail close to the compass (according to the basic properties of the magnet) to measure the north and south poles of the electromagnet.

2.Immediately the music was played, and there was a light that was shining and it was converted into light energy.

The three-dimensional paper cake is converted into kinetic energy when it rotates.

1.Sound is produced due to objects (vibrations).

2.When light encounters an object, it changes the direction of propagation and is reflected back, a phenomenon called light (reflection). 3.

The degree of heat and cold of an object is called (temperature) and is usually represented by the symbol (t). 4.Normally, the body temperature of the human body is (37 0C) and the temperature at which water freezes is (0 0C).

5.Heat is always transferred from the hotter end to the cooler end, and this type of heat transfer is called heat transfer.

1.The tighter the rubber band is pulled, the sound (b) makes.

The lower the A, the higher the B, the lighter the C.

2.The ability to reflect light is (c) in order of strongest to weakest.

a Mirror, black paper, white paper b white paper, mirror, black paper c mirror, white paper, black paper 3The shadow of the flagpole is 5 meters long during the day, and after a while, the shadow becomes shorter, and this phenomenon occurs in (a).

A a.m.b p.m.c p.m.

4.A magnifying glass is a type of (a) that magnifies the image of an object.

A convex lens, B concave lens, C flat mirrors.

5.(b) It is an energy-saving device designed by using various principles such as heat absorption and heat preservation of materials.

a Dirt**b Solar Water Heater c Periscope.

6.There are gaps between the rails of the train, and the principle of design is (a) nature.

a Thermal expansion and cold contraction of metals b Thermal shrinkage and cold expansion of metals c Strong sound transmission ability of metals 7Objects that are both very strong in heat conduction are (c).

a Wood, aluminum, iron b Plastic, foam, copper c Aluminum, copper, iron 8When measuring water temperature, (c) below is correct.

A Immerse the lower end of the thermometer in water, which can touch the bottom and wall of the container, b The thermometer should be taken out of the water and read again.

c Wait until the liquid column of the thermometer is no longer rising or falling.

1.Shake.

2.Reflection. 3.Temperature

0℃5.Thermal conduction.

Vibration reflection.

Goo (b0°Goo (ba, c

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A changing and colorful earth.

Clothes made of different materials are worn on the body, some are cool, some are warm.

The earth also has a variety of clothes, colorful and colorful, and they change with the passage of time. The Earth's unique atmosphere, water, and life make it a unique and colorful planet in the solar system.

The atmosphere is the most important coat of the earth, it intercepts the heat that blocks the sun, and at the same time prevents the heat from the ground from being lost to the universe. The spaceship allows for this wonderful realm, and the temperature of the spaceship in the shadows can be as low as -273. At high altitude, although it has not yet flown out of the outer layers of the atmosphere, the air there is so thin that it is close to the artificial vacuum on the ground and cannot play the role of heat absorption and warmth.

The blue clothes are ocean lakes, warm in winter and cool in summer. This is because water can absorb a lot of heat, and when the sun is strong, water absorbs a lot of heat, which plays a role in lowering the temperature; When the weather turns colder, the water releases the heat one after another, so that the temperature does not drop too low.

In the mountains, the air is thin, the water vapor content is low, the heat comes and goes quickly, and to a certain extent, the expenditure exceeds the income. It is often covered by snow all year round, and it is dressed in white. The white clothes reflect a lot of this heat, and the white snow that has just fallen can reflect back about 90% of the heat that hits the ground, which makes the temperature even lower.

What can make the cold, warm, dry and wet on the earth more suitable for human needs is the green clothing. Plants cover the ground, and the densest is the forest, which plays an important role in improving the climate. Unfortunately, compared to the vast territory of our country, the forest area is too small.

The clothes of the earth are so closely related to the climate that we need to make it fit. It is possible to do it, and it is being done. Afforestation and reasonable dense planting are stepping up the weaving of green clothes; The work of blackening the glaciers and blackening the white garments also began; There is more work to be done to cut clothes for the earth and draw dragons and embroidery styles.

After the spaceship is launched, we will also have a clearer understanding of the most important invisible cloak of the earth, the atmosphere. It will also be possible to control it and transform it in the future. We can make the planet's climate better day by day.

1) The metaphors in the article are vivid, please also use the earth as the object and make two metaphorical sentences.

2) What specific work have people done to put the planet in the right coat? Draw it in the text with ".

The garments of the earth.

Surface phenomena. The role of clothing.

Blue clothes.

Makes the winter warm and the summer cool.

High mountains at the poles. Green clothes.

4) The earth is so lovely, what practical actions do you want to take to protect it? Please write down your thoughts.

Only type 7 answers.

1.Isolated from oxygen.

2.Plated with anti-oxidation paint.

3.Soak in sulfuric acid.

1. First, the accumulation of eye fatigue caused by poor eye habits will lead to spasm of the ciliary muscle, which regulates the thickness of the lens to control the near and far and the ciliary process secreting aqueous humor. However, if the ciliary muscle spasms and cannot relax normally, the vision will be blurred and the vision will be reduced, which is pseudomyopia. The ciliary process cannot metabolize aqueous humor normally, so the internal circulation and metabolism of the eye are disordered, and the intraocular pressure increases, which will compress the corneal extravexity to form a refraction, and every 1mm increase is equivalent to 300 degrees.

Corneal extravexity is only refractive myopia, at this time, just wearing glasses, the intraocular pressure continues to increase, which will cause the vitreous to blur, the eye axis will be extended backwards, forming axial myopia, which is irreversible.

Second, eating sweets often causes the sclera to soften, so that the extraocular pressure compresses the growth of the eye axis. Third, picky eaters and too much concentrated food supplementation will also overdevelop the eyeball and make the eye axis grow. It is increased by 1mm and deepened by 300 degrees. The main cause of myopia is eye habits.

2. Poor eye hygiene can easily cause bacterial infection of the eyes, resulting in conjunctivitis, so that the eyes are very weak, and it is easier to accumulate eye fatigue, and the internal circulation and metabolism of the eyes will be affected, and myopia will be formed calmly.

3. Glasses are only a tool to assist in seeing far away, and have no effect on correcting myopia. If you can see clearly from a distance and don't squint, you don't need to wear glasses. Even if you see blurry from a distance, ordinary glasses will do.

Therefore, to correct and prevent myopia, we first need to start with eye habits, good eye habits, and then eliminate daily eye fatigue, and regulate the internal circulation and metabolism of the eyes are fundamental, so as to control the continued development of myopia.

(1) The lens is too thick.

2) Seeing things close for too long causes eye muscle fatigue.

3) Concave lenses.

1) Retina.

2) Optic nerve.

3) Lens.

4) Vitreous.

1.The refractive index of the lens becomes larger.

2.Excessive fatigue.

3.Concave lenses.

1.Retina.

2) Optic nerve. 3) Lens.

4.Vitreous body.