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The sun is a huge, hot and bright star. It is important because without it there would be no life on the earth. The sun gives us light and heat.
All living things depend on the sun for their growth. Plants need light and heat to grow. They use the light from the sun to make food. But we human beings cannot make food by our own bodies from the sun. All the food we eat comes from plants in a food chain(链) . And the food chain starts with the sun . For example.
sun —→ 
potatoes —→ 
chips
sun —→ 
corn —→ 
hens —→ 
eggs
sun—→ 
wheat —→ 
bread
Animals need sunlight, too. Just like us, their food comes from plants in food chain, which begins with the sun. For example,
Sun → leaf → caterpilllar(毛虫) → bird
Sun → seaweed(海藻) → small fish → whale(鲸)
With the help of sunlight, we can see things during the day. Even when the sky is cloudy, the sunlight is very strong and it shines through the clouds. If there was no sun, it would be dark all the time.
1.The sun is a star.
A. huge, cold and bright B. huge, hot and bright C. small, warm and bright
2.What are the two main things the sun gives us?
A. Light and heat. B. Heat and eggs. C. Corn and light.
3.From the passage we learn that .
A. when the sky is cloudy, there is no sunlight at all
B. without the sun there will be no life on the earth
C. we human beings can make food by our own bodies
4.All the food we eat comes from in a food chain. And the food chain stars with the .
A. plants; earth B. plants; sun C. animals; star
5.Which is the best title (标题) for this passage?
A. Plants need heat and light to grow
B. All living things depend on the sun for their growth
C. The sun is very important
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WHY IS THE SUN IMPORTANT？
The sun is a huge, hot, bright star. It is important because without it there would be no life on Earth. The sun gives us light and heat.
All living things need light and heat from the sun to live. Plants need light and heat to grow. They use the light from the sun to make food. We cannot make our own food, but plants can. All the food we eat comes from plants in a food chain(链)which starts with the sun. For example,
Animals need sunlight, too. Just like us, their food comes from a food chain which begins with the sun and the plants.
sun→ leaf→ caterpillar(毛虫)→bird
sun→ seaweed(海藻)→small fish→ whale(鲸)
Sunlight means we can see during the day. If there was no sun, it would be dark all the time. Even when the sky is cloudy, the sunlight is very strong and it shines through the clouds.
1.The sun is a star.
A. huge, cold and bright
B. huge, hot and bright
C. small, warm and bright
2.What are the two main things the sun gives us?
A. Light and heat.
B. Heat and eggs.
C. Corn and light.
3.From the passage we learn that .
A. when the sky is cloudy, there is no sunlight at all
B. without the sun there will be no life on the earth
C. we human beings can make food by our own bodies
4.All the food we eat comes from in a food chain. And the food chain stars with the .
A. plants; earth
B. plants; sun
C. animals; star
5.Which is the best title (标题) for this passage?
A. Plants need heat and light to grow
B. All living things depend on the sun for their growth
C. The sun is very important
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The sun is a huge, hot, bright star. It is important because without it there would be no life on Earth. The sun gives us light and heat.
All living things need light and heat from the sun to live. Plants need light and heat to grow. They use the light from the sun to make food. We cannot make our own food, but plants can. All the food we eat comes from plants in a food chain (链)which starts with the sun. For example,
Animals need sunlight, too. Just like us, their food comes from a food chain which begins with the sun and the plants.
sun→ leaf→ caterpillar (毛虫)→bird sun→ seaweed (海藻)→small fish→ whale
Sunlight means we can see during the day. If there was no sun, it would be dark all the time. Even when the sky is cloudy, the sunlight is very strong and it shines through the clouds.
1.What are the two main things the sun gives us？
A. Light and heat. B. Heat and eggs.
C. Corn and light. D. Wheat and bread.
2.Why can we still see during the day when the sky is cloudy？
A. Because the clouds gives the light.
B. Because the sun can't give us light all day long.
C. Because the sunlight can shine through the clouds.
D. Because the sunlight can shine through the chain.
3.All the food we eat comes from ______. And it starts with the _____.
A. plants; earth B. a food chain; sun
C. plants; sun D. plants; star
4.In what way do you think the sun cannot be harmful？
A. The sun can do harm to your eyes and skin.
B. The sun can sometimes make rivers too dry.
C. Without it there would be no life on Earth.
D. Hot sun on dry land can cause fires.
5.From the food chains given in the passage, we can know _____.
A. Whales like eating seaweed most
B. A caterpillar’s favourite food is bread
C. Small birds live mainly on caterpillars
D. The food hens eat comes from potatoes
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Our sun is a star. Like all stars, it is a mass of （ 一大团）very hot gases. The sun’s energy doesn’t come from burning fuels（ 燃料 ）. The sun’s energy comes from its nuclear fusion.( 核聚变 )
How big is the sun? Its diameter, the distance across its center, is quiet huge. That’s more than 100 times the diameter of Earth. The sun’s volume is more than a million times the volume of the Earth. Another way to say this is that the sun could hold one million Earths inside it.
The sun has different layers of gases. Each layer mixes into the next, like the layers of Earth’s atmosphere.（ 大气 ） Most of the sun’s mass is in its center. It is also very hot. Almost all fusion takes place in the center.
The sun creates energy in the form of heat and light. Even though the sun is a ball of gases, it is made up of several layers. The main layers are the center. There are also other layers. The sun produces hug energy. Its energy mainly comes from its center. The sun is the source of most of the energy on Earth. Without the sun, there will be no living things on earth, including human beings.
1.What are the gases of the sun like?
A. Very hot
B. Very bright
C. All of the above
2.The sun’s energy comes from .
A. X—rays
B. nuclear fusion
C. layers of gases
3.The diameter of the earth is about 6300 km. How about that of the sun?
A. About 6300km
B. About 63000km
C. About 630000km
4.What’s the meaning of the underlined word “ volume” according to the passage?
A. 形状 B. 面积 C. 体积
5.What’s the last two paragraphs about?
A. The sun has many layer.
B. Where the sun energy is from.
C. How the sun energy is made.
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— Why _____ most stars _____ in the daytime?
— Because the sun is too bright.
A. can’t; see B. can’t; be seen
C. weren’t; see D. weren’t; seen
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— Why _____ most stars _____ in the daytime?
— Because the sun is too bright.
A. can’t; see B. can’t; be seen
C. weren’t; see D. weren’t; seen
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— Why _____ most stars _____ in the daytime?
— Because the sun is too bright.
A．can’t; see B．can’t; be seen
C．weren’t; see D．weren’t; seen
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Our sun is a star, and nine worlds (天体) move round it. Worlds like these are planets. But there are other stars, other suns, not only thousands of them, but millions of them. Do different stars have planets? We can see the planets round our own sun. but we haven’t been anymore. The stars are too far away from us. Stars give out light, but the planets don’t have any light of their own. So we can’t see them. They are too far, and too dark. Still, we can tell that some stars have planets. While a big planet goes round, it pulls its star to one side. And sometimes we can see this. Then we know that the star has a planet. For example, Barnard’s Star is a small red star. And it is the quickest star in the universe. But sometimes it moves slower, and then quicker again. We have known Bernard’s Star for many years, and now we are sure it has a planet.
1.A star is a large body in the universe. It _________.
A. moves round our sun B. has light of its own
C. can also be called a sun D. both B and C
2.Which of the following is not true?
A. The earth is one of the sun’s world’s
B. There are millions of suns in the universe
C. The worlds are very bright
D. some stars have planets
3.We can see the planets round our sun. But we can’t see ________.
A. nine worlds in the universe
B. the planets round other stars
C. the satellites round the earth
D. other stars
4.Barnard’s Star moves more quickly than ________.
A. most stars B. any other star
C. its planet D. the planets round the sun
5.How can people know that there is a planet round Barnard’s Star?
A. Sometimes they see that the planet pulls the star to one side and makes it move slower.
B. The planet is shining
C. The planet is next to our earth.
D. The planet is a red one.
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Of all the stars the sun is the nearest to the earth. Millions of other stars are even bigger and brighter than the sun. They look small only because they are much farther away. You can’t see them in the daytime. But if you go out at night, you’ll be able to see thousands of them.
The earth is one of the sun’s planets, and the moon is our nearest neighbor in space. Men have visited it already. No man has traveled farther than the moon, but spaceship(宇宙飞船) without people have reached other planets.
Many countries have sent up man-made satellites(人造卫星) to circle the earth. With their help, people have done much research in many fields of science.
Our country sometimes uses man-made satellites to send and receive TV programs. This has helped the people of China and other countries to understand each other better.
根据材料内容选择最佳答案。
1.The sun looks bigger and brighter than other stars because ________.
A. we can’t see millions of them.
B. it is the nearest one to the earth
C. it is much farther away from other stars.
2.Our nearest neighbor of the earth in space is _______.
A. the earth B. the moon C. the spaceship
3.Man-made satellites can help us _______.
A. to visit the stars
B. to get to other planets
C. to do much research
4.Our country has sent up man-made satellites _______.
A. to travel to other stars
B. to circle the moon.
C. to sent and receive TV programs.
5.Which is true in the following sentences ?
A. The sun has only one planet in the place.
B. We can’t live on the earth.
C. Man-made satellites have helped the people of China and other countries to understand each other.
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The sunshine is so bright and hot. Why not your sunglasses?
A. put on B. take off C. wearing D. putting on
potatoes —→ 
eggs