题型：选词填空（语篇） 题类：常考题 难易度：普通
| busy, small, big, interesting, clear, quite, for |
Our school is in a town. You can't find it on the map. In our school there is an garden. In the middle of the garden there is a apple tree. After class the students often have a rest under it. Near the garden there is a library. You can read the books in the reading room, But you must be in it and keep the room clean.
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worse solution covering themselves patient's dangerous but decisions ability researching |
A Cloud of Hope and Danger
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 called nano-robots( 纳米机器人) . These tiny robots move from cell(细胞) to cell in the {#blank#}2{#/blank#} body, destroying the cancer.
Fighting cancer with nano-robots is only an idea today, {#blank#}3{#/blank#} scientists say that it could 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. For this reason, nano-robots will have to be programmed to build {#blank#}6{#/blank#} . Scientists will not have the ability to build millions of nano-robots one by one.
This {#blank#}7{#/blank#} to reproduce is making some scientists worried. What if something goes wrong in the programming? Quite a lot of crazy nano-robots would be far {#blank#}8{#/blank#} than any disease. Some people think that if they get out of control, nano-robots could destroy the Earth.
What should be done? Should we continue {#blank#}9{#/blank#} nano-robots 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.
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