Knowledge is an awareness of the conviction of a subject and of the potential capacity to use it for specific purposes. The following is a collection of children's encyclopedia competitions shared by the network. Welcome
Part one
Scientists believe that the planet has existed for at least several billion years
A, 30b, 40c, 50
(b. The age of the earth, as measured by scientists, is 4. 6 billion years. If the age of the earth is compared to one day, then human beings appear at the last minute of that day
Two, orbiting the sun. How many planets
A, 6b, 8c, 10
(b, originally thought there were nine planets, and scientists later determined that pluto was not a planet, and now only eight
3. The day and night appear alternately because:
A. Earth rotation b. Earth rotation
(a, the earth rotates around the sun, calling it a public turn, one round around the sun for a year, while the earth rotates, and one round for a day
How many time zones in the world
A, 12b, 24c, 36
(b. Because the earth always turns from west to east, the east is always the first to see the sun, and the east is always earlier than west. In order to overcome the confusion of time, the world has been divided into 24 time zones, 13 different time zones between beijing and washington, d. C., where we are here during the day and they happen to be at night
5. Walking on the moon
A, like the earth, is as light as c, and hard to move
(b, the mass of the moon is much smaller than that of the earth, and gravity on the moon is about one sixth of the earth, so walking on it feels light
6. The moonlight we see is:
A, light b from the moon, light c from the moon reflecting the earth, light from the moon reflecting the sun
"c, the moon itself, the light we see, the light that reflects the sun."
7. Air is a colourless, odourless, transparent mixture of gases, which contains the most gases
A, nitrogen b, oxygen c, carbon dioxide
(a, nitrogen, nitrogen in air: 78% oxygen: 21%; co2: 0. 03% rare gases: 0. 94%
8. The rocks formed after the eruption are called:
A, magma b, sediment c, variable rock
(a. As a result of crustal motion, magma under the crust erupts into the surface and forms magma
9. The world's first river is:
A, nile b, amazon c, yangtze
(a, the nile is the longest river in the world, 6,650 km long, passing through east and north africa
10. The world's first largest river is:
A, nile b, amazon c, yellow river
(b, the amazon, located in south america, is the river of the world. The flow is several times larger than the sum of the three other rivers, the nile, the yangtze and mississippi, with basins covering 40 per cent of the size of south america; the number of tributaries exceeds 15,000
Title ii
1. The world's deserts are:
A, b of the sahara, c of the arab desert, takramakan desert
(a, the sahara desert covers one third of africa, with more than 9 million square kilometres, almost the size of one china
2. Our daily consumption of fresh water accounts for the world's total:
A, 30% b, 10% c, less than 1%
(c) less than 3 per cent of the earth's water is freshwater, while more than 65 per cent of freshwater is ice, and we drink less than 1 per cent of the world's total water
3. The countries with the most frequent earthquakes are:
A, japan b, indonesia c, guatemala
(a, an earthquake is the movement of the earth's crust, and when the rock breaks, it produces a strong vibration that releases energy. The country most frequented by earthquakes is japan, which is located in the crust belt at the border between the asia-europe plate and the pacific plate, where the crust is extremely unstable and can average 3-4 earthquakes a day
4. What materials are the first tools used by humankind
A, b, stone c, copper
B. Stones, which we call the stone age, were used as a labour tool in the early days of mankind
The first films were:
A. Eighteenth b, nineteenth c, twentieth
(b, nineteenth century, on 28 december 1895, the french lumiere brothers publicly screened in paris several short films they had filmed and were recognized as first public films. The first film on that day, train entry, became the first public screening of a world film
How long is the great wall
A, less than 10,000 miles b, more than 10,000 miles c, just 10,000 miles
(b, china's great wall of miles is one of the seven wonders of the world and travels more than 10,000 miles
7 - what time is cao cao
A, b, c, c
(b, during the trinational period, cao cao was our trinational military, statesman and literaryist
8. The four major inventions of china's ancient times are:
A. Gunpowder b. Geodynamic c. Guides
(b, geomotion, does not belong to the ancient chinese inventions. Four major inventions are the four inventions that have had a great impact on the world in china's ancient times. These are paper-making, compasses, gunpowder, print work. It is generally recognized that these four inventions have had a tremendous impact on china's ancient political, economic and cultural development, and that they have been transmitted to the west by various means and have had a significant impact on the history of civilization in the world
9. The newspapers were the first news carriers in the country to issue:
A, don dynasty b, song dynasty c, ming dynasty
(a, tang dynasty, the first newspaper to be published in the country is recognized by the academic community as the official newspaper of tang dynasty
10. Our "poetry" refers to:
A, b, c, d
(c, duff, all three of them are famous poets of tang dynasty, of whom li baek is dubbed "the poetry" and tofu is dubbed "poetry" and li ho is dubble."
Part iii
In which city did the 2xx olympics take place
A, beijing b, athens c, sydney
(a, beijing, the first olympic games of 2008 was held in beijing, my country, with a successful outcome that brought to the attention of the world the human ethos, style and abilities of china
2. The first chinese male athletes to receive gold medals in the olympic track project are:
A, li ning b, hsu hae c, liu shang
(c. Liu shang, who won the gold medal at the finals of the 110-metre male olympic games in athens in 2004, won the first male olympic championship in the chinese track and track project, creating the myth of the chinese on the 110-metre male field project. It is also a pride for asia as a whole and is hailed as the “asian first flying man”
3. The chinese martial arts are known to the world as follows:
A, tai chi box b, c, taekwondo
(a, tai chi boxing, chinese martial arts are long, sophisticated and well-known in the world. China's martial arts influence is greater in tai chi boxing, shaolin boxing, taekwondo, small caves, break-ups, etc., whereas modern boxing originates in the united kingdom and taekwondo in the former north korea
4. The provinces of the country's size are:
A, sichuan province b, xinjiang uighur autonomous region c, inner mongolia autonomous region
(b, xinjiang uighur autonomous region, located in the north-western part of china, covers 1. 66 million square kilometres, approximately one sixth of the total area of china and is the province of our administration
5. Where are the hottest places in the country:
A, nanjing b, nansha islands c, taruzan basin
"c, the torrupan basin, where the flame mountain lies in the western simulator."
6. Which system does noise harm to humans: (a), cardiovascular system b, digestive system c, respiratory system
7. People on earth watch clear skies blue because: (c)
A. The seawater on the mainland reflects the sky as blue b. The blue in the sunlight is reflected by objects as blue
C. The blue light in the sunlight is dispersed by particles in the sky into blue d. Space itself is blue
What's the moon? (c)
A: star b: planet c: satellite
9. Plants are the food of many animals, while plants themselves are produced mainly from photocooperative uses. Plants need air in addition to solar energy and their own chlorophyll in their light cooperation (a)
A, carbon dioxide b, carbon monoxide c, oxygen d, nitrogen oxides
10, what do ants do? (a)
A: tentacle b: quadrilateral c: mouth
11. Which of the following forms of drinking water is not appropriate: (a)
A. Drinking b after eating, thirsty and drinking c. Drinking and drinking water based on dietary nutrient composition volume
Mammals are the same vertebrates that feed their first-born larvae from maternal breast milk. Which one is mammal
13, the ping-pong ball is flattening
14: bats don't catch mosquitoes at night. What do they need? Wave
Frozen food with ice, with ice placed in food: (b)a, above b., below c, in the middle
16: why does a dog always breathe with his tongue? (a)a, heat b, run too fast c, help breathe
17: what's the voltage of household lighting circuits? (b)a, 110 b. 220 c, 380 v)
18, touch the iron and wood outside the room with your hands in the winter? (b)a, as cold as b, as cold as c, as cold as wood
19 - why do you see flashes and then hear thunder? (b)
A, lightning and thunder are not happening at the same time. The sound spreads faster than the light
C. The sound spreads faster than the light
