题型：选词填空（语篇） 题类：模拟题 难易度：普通
四川省眉山市仁寿县华兴联谊学校2019年九年级英语“二诊考试”试卷（含听力音频）
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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, her body and filling her lungs (肺). The cloud is not smoke or steam. It is made of millions of microscopic robots 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, 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 to many of today's problems.
However, nano-robots could be a risk as well. Since nano-robots are so tiny, they will have to work in large teams of many thousands to 'many millions. this reason, nano robots will have to be programmed to build . 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 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 nan-orobots or should we search for other methods? This is one of the many difficult that we have to make in the future.
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