A Cloud of Hope and Danger

    In 2050, a small cloud floats through the air in a hospital operating room (手术室). In the room a patient, suffering from cancer, lies on a table. The cloud surrounds (包围) the patient, {#blank#}1{#/blank#} her body and filling her lungs (肺). The cloud is not smoke or steam. It is made of millions of microscopic robots {#blank#}2{#/blank#} nano-robots (纳米机器人). These tiny robots move from cell (细胞) to cell in the patients' body, destroying the cancer cells.

    Fighting cancer with nano-robots is only an idea today, {#blank#}3{#/blank#} scientists say that it would be possible in the future. Using nano-robots for good purposes such as fighting disease or repairing the environment may be the {#blank#}4{#/blank#} to many of today's problems.

    However, nano-robots could be a {#blank#}5{#/blank#} risk as well. Since nano-robots are so tiny, they will have to work in large teams of many thousands to 'many millions. {#blank#}6{#/blank#} this reason, nano robots will have to be programmed to build {#blank#}7{#/blank#}. Scientists will not have the ability to build millions of nano-robots one by one.

    This ability to reproduce (复制) is making some scientists worried. What if something goes wrong in the programming? Quite a lot of crazy nan-orobots would be far {#blank#}8{#/blank#} than any disease. Some people think that if they get out of control, nan-orobots could destroy the Earth.

    What should be done? Should we continue {#blank#}9{#/blank#} nan-orobots or should we search for other methods? This is one of the many difficult {#blank#}10{#/blank#} that we have to make in the future.

A: The new year is coming. Did you make a New Year's resolution yesterday, Michael?

B: Yes, Maria, I {#blank#}1{#/blank#}.

A: What are you going 1o do?

B: I am going to make a football team at the {#blank#}2{#/blank#}of the next year. I like it very much.

A: Wow! What are you going to do for it?

B: I'm going to play with my teammates, and I'm going to practice it every day.

A: Great! I want to be a{#blank#}3{#/blank#}when I grow up. You know 1 like writing very much.

B: Sounds {#blank#}4{#/blank#} ! What are you going to do?

A: I am going to practice more next year and send them to {#blank#}5{#/blank#}and newspapers.

B: Are you going to take part in the writing competition next year?

A: Yes, of course. That's a good chance.

B: Wish you success,

A: Thank you.