Question

 Our sun is a star. Like all stars,it is a mass of(~"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 one hundred times the diameter of

Earth. The sun's volume is more than a million times the volume of Earth. Another way to say this is that the sun could hold one million Earths inside(在.. 内)it.

   The sun has different layers(层)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 huge 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.

根据短文内容，选择最佳答案。

(   ) 1. What are the gases of the sun like?

A. Burning. B. Very hot.

C. Very bright. D. All of the above.
(   ) 2. The sun's energy comes from      

A. nuclear fusion    B. burning fuels

C. X-rays D. layers of gases

(   ) 3. The diameter of the earth is about 6300

kilometers. How about that of the sun?

A.   About 6300 kilometers.

B.   About 63000 kilometers.

C.   About 630000 kilometers.

D.   About 6300000 kilometers.

(   ) 4. What's the meaning of the underlined word " volume " according to the passage?

A.形状         B.广度

C.面积         D.体积

(   ) 5. What's the last two paragraphs about?

A.   The sun has many layers.

B.   Where the sun energy is from.

C.   How the sun energy is made.

D.   The sun is the source of the energy on Earth.

Answer 1

1. B  由第一段第二句可知，太阳是一大团炙热的气体。

2. A  由第一段最后一句可知，太阳的能量来自于自身的核聚变。

3. C由第二段第三句可知，太阳的直径是地球直径的一百倍。

4. D  由下一句Another way to say…可推断volume意为"体积"。

5.B最后两段主要讲述太阳能量来自于哪儿。