A small cloud moves slowly through the air in a hospital operating room（手术室）. In the room a patient with cancer lies on a table. The cloud is all around the patient, covering her body and filling her lungs. The cloud is not smoke. It is made of million of nano-robots（纳米机器人）. These tiny robots move from cell（细胞）to cell in the patients’ body, killing the cancer.
Fighting cancer with nano-robots is only an idea today but scientists say that it could be possible in the the future. Using nano-robots for good purpose such as fighting the illness or repairing the environment may be the way to many of today’s problems. In the future, scientists at Rutgers University believe that nano-robots will help operation because it is the transporter of biological elements such as DNA and proteins.
However, nano-robots cloud be a dangerous risk as well. Because nano-robots are so tiny, they will have to work in large teams of many thousands to many millions. For this reason, nano-robots will have to be programmed to build themselves. Scientists will not have the ability to build millions of nano-robots one by one.
This ability to re-produce is making some scientists worried. What will happen if something goes wrong in the programming? Quite a lot of crazy nano-robots would be far worse than any illness. Some people think that if they get out of control, nano-robots could make the Earth gone.
What should be done? Should we continue researching nano-robots or should we search for other methods? This is one of the many difficult decisions that we have to make in the future.
【小题1】What is the cloud in the passage?| A．Smoke in the air |
| B．Millions of nano-robots |
| C．Something full of drops of water |
| D．Clothes to cover a patient |
| A．Fighting cancer with nano-robots |
| B．Moving from cell to cell |
| C．Killing the cancer |
| D．Repairing the environment |
| A．Nano-robots can’t be programmed to build themselves. |
| B．Something may go wrong in the programming. |
| C．Scientists have to build millions of nano-robots one by one. |
| D．Nano-robots in large teams may be out of control. |
| A．He agrees to the idea. | B．He disagree to the idea. |
| C．He doesn’t talk about his opinion. | D．He is crazy about it. |
| A．Future Robots | B．The Ways to Fight Cancer |
| C．Nano-robots in Use | D．A Cloud of Hope and Danger |
