1. 阅读理解

    Scientiststhink that there has been life on earth for millions of years. However, wehaven't found life on other planets yet. The earth is a planet and it goesaround the sun. And there are seven other planets that also go around the sun.The sun and its planets are called the solar system. The solar system is asmall part of the universe.

    Scientistshas launched many spaceships to explore other planets in the solar system. Somespaceships have gone beyond the solar system. However, no one has discoveredany life in space yet.

    Why has noone from other planets sent us a message? Have they tried to send informationto us? With so many stars in space, are we alone, or is there life on otherplanets in space?

1. （1） Scientists think that there has been life on earth for_________.

   A . millions years B . millions of years C . million years D . million of years
3. （2） The earth is a planet and it goes around_________.

   A . the moon B . the solar system C . the sun D . the universe
5. （3） The solar system is a small part of_________.

   A . the planets B . the universe C . the spaceship D . the earth
7. （4） _________have gone beyond the solar system.

   A . Some explorers B . Some planets C . Some scientists D . Some spaceships
9. （5） What's the best title for the passage?

   A . Is There Life Out There? B . Our Planet C . The Stars at Night D . The Spaceship