阅读短文。把A-D四个句子填入文中空缺处，然后完成第5题。

      I think life will be very different in a hundred years' time. Some things will be better and some things

 will  be worse.

     Firstly, people won't live on the surface of the earth. __1__ Special machines will provide oxygen and

  light but the environment won't be the same. Trees and plants won't grow because there won't be any

soil. __2__  . Food will mainly be in the form of pills. If the sea isn't too polluted, people will also eat fish. 

 What is more, I think people's everyday life will be different. __3__ . No one will have to do housework

  either. So, people will have more free time and they will be able to enjoy the things they like sports, for

  example. Finally, I believe that everyone will be able to travel to the moon, to other planets and perhaps

 even to other galaxies (星系) for a holiday.

     In conclusion, __4__ . Whatever happens, though, I'm sure there will be an interesting place to live in the future.

 A. They won't have to work long hours because computers and robots will help them.

 B. Our cities will be under the sea, in large domes (圆顶屋).

 C. I think that life in the future won't be anything like it is now.

 D. As a result, people won't be able to grow crops.

5. What is the best title of the passage?

    A. Life under the Sea 

    B. The Future Life

    C. Future Life in My Mind

    D. An Interesting Place to Live in