1. 阅读理解

    As long as people live on Earth, we will never stop looking up at bright stars in the night sky.

    We are always trying to understand the universe. Astronauts know that not all stars are the same. Some are almost as old as the universe itself, and others may be born just now. They are in different colours, blue, white, yellow and red. Some shine brightly in the sky, while others are Visible only with special tools. You can't see them with your eyes. Some stars run through space in pairs or groups, while others move alone.

    One of the most important ways that scientists group stars is by size. In the early 20th century, just World War I, astronauts began to put stars into two main size groups.

1. （1） Underlined word Visible means __________________ in Chinese.

   A . 宇宙的 B . 外星的 C . 可见的
3. （2） According to the passage, people use the special tools to ________________.

   A . make star groups B . check when the stars were born C . protect their eyes when watching stars
5. （3） According to the passage, there are __________________ different colours of stars in the sky.

   A . three B . four C . five
7. （4） Stars may be first put into two groups __________________.

   A . before 1914 B . after 1944 C . in 1955
9. （5） The best title of the passage may be __________________.

   A . How to watch stars B . Stars in the sky C . The sun and the stars