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.

What is a museum? A museum is a good place to keep old and beautiful things. A museum may be a place to learn about science and a place to find out about art or people or animals.

What is inside a museum? Some museums have old cars and airplanes. Many museums have pictures and statues(雕塑). Others have rocks and old bones (骨头). One museum even has a real old street inside. It has shops and people’s statues doing business. It looks so real that one might feel that he was back to the old time.

Many cities have museums. Some very small towns have museums, too. Indianapolis has a children’s museum. Children do not have to pay (付款) to get in. Children often go to the museum. They like to look at the dinosaur (恐龙)bones. They see a white bear ten feet tall.

On Saturdays, Indianapolis children can hear talks about animals and trees. They see movies. They take hikes. They even learn to make things there.

1.What is Not true about a museum?

A. It’s a good place to do some shopping.

B. People can learn about the history of a place there.

C. People can learn about science there.

D. It’s a good place to learn about art.

2.In Indianapolis _______________.

A. there is only one museum for children

B. it’s free for children to visit the children’s museum

C. people do not have to pay to visit the children’s museum

D. museums are all the same

3.In the children’s museum in Indianapolis, children like to see ___________.

A. the dinosaur bones B. all old bones

C. old streets D. airplanes

4.The main idea of the passage is that____________.

A. old cars and airplanes are in museums

B. There are many animals and trees in museums

C. there are all kinds of museums

D. children like museums

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