题目内容：

缺词填空

There is nothing more i  1.  to life than the sun. W 2.  the sun, all living things on the earth would die. The sun is a star. In the sky there are t  3. of stars like the sun. They are as large as the sun and as hot as the sun. At night you can see many stars, but in the daytime you can o  4. see one star—the sun.

The sun is much n5.  to us than the other stars. That is w  6.   it looks the biggest and brightest of all the stars. The distance (距离) of the sun from the earth is as m  7.  as 150,000,000 kilometers. Most stars are thousands of light-years a  8. from the earth.

Do you know what a light-year is? N 9.  in the world travels faster than light. It travels 300,000 kilometers per second. And one light-year is the distance that light can travel in one y 10.  .