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 called nano-robots(纳米机器人). These tiny robots move from cell(细胞) to cell in the 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. For 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 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 continuenan-orobots or should we search for other methods? This is one of the many difficult that we have to make in the future.

Nowadays, working as a tutor in the free time is more and more for a college student. But what is a tutor?A tutor is a private teacher who a certain student or a small group of students. So if you are good at some , why not work as a tutor?It's a win­win thing because you make full of your time and make money at the same time. All you need to do is to make a proper ad of your service by using college newspapers and tools to spread your information.

China's Lengji Village, the coldest village in China, has become a famous tourist attraction. Itin Genhe, in the northern part of China.

Tourists have come tolife in Lengji Village where temperatures often drop 30 degrees below zero. They also have the chance to watch local working in the winter to protect the natural environment. To protect the snow-covered forests, villagers work all kinds of jobs at a local forest farm.

"Every day, we would patrol the forests. The forests of our motherland must be " said 51-year-old Cheng. "The forest has been under protection. Not only has it become larger, but it has become as we can see. The protection has also brought more wild animals."

completing his patrol, Cheng returned home and cooked local traditionalcalled "eight big bowls" to treat some tourists visiting his village. The old factory buildings were offered to the enterprising forestry workers. Some of have developed family tours in the area, making the development of "China's Cold Pole Village" more successful.

The local tourist industry has developed after ski facilities, ski rings and other snow activities were introduced.

The Lengji Village saw 36,000 trips in 2020, which led to Cheng's income increasing to more than 5,000 yuan every month.