As space science develops, man has learned more and more about space. Space is not only 【小题1】 but also dangerous. While working in space, spacemen are facing danger as well as success.

Scientists have 【小题2】 out that the radiation (辐射) is the greatest danger to spacemen. When 【小题3】 are working in space, they are in danger of the radiation from the sun and other stars, which is bad for their health.

Space 【小题4】 is also thought to be a great danger to spacemen. It’s reported that there were 9,000 man-made things flying in space. About 30% of these are satellites, 10% are 【小题5】 , and the rest are space rubbish. A small 【小题6】 of rubbish even knocks a spaceship window and 【小题7】 some damage (损坏).

Scientist are watching and reporting any possible danger all the time. They are working to deal 【小题8】 space rubbish. 【小题9】 space is really dangerous, it interests many people on the earth. In the near future, it may become 【小题10】 for people to spend a few days in a space hotel. We may even choose to leave the earth and live in space in a few years. So we should do something to help improve the space environment.

In the minds of the Chinese, they always【小题1】the moon with gentleness and brightness, expressing their best wishes. On August 15 of the lunar calendar each year, the moon is full and it’s time to celebrate the Mid-Autumn Festival.

In Chinese traditional culture, the moon is a【小题2】of human’s feelings. In ancient times, from royalty to the ordinary family, it was an important custom【小题3】the full moon during the festival. Adults usually enjoyed delicious mooncakes with a cup of hot tea,【小题4】children ran around with bright lanterns. After nightfall, whole families went out for a walk under the stars, looking up at the full moon and thinking of their relatives or friends, as well as【小题5】was far from home. A line from a poem “The moon seen at home is brighter” expresses those feelings.

Besides, with respect to the history of Chinese civilization（文明）, China is the first nation to have the dream of flying to the sky.【小题6】the story of Chang’e to Dunhuang flying apsaras, all express Chinese ancestors’ desire to explore（探索）outer space. Many ancient Chinese poets also showed their great【小题7】in the moon through wonderful words. For example, the poet Li Bai, a【小题8】lover of the moon, wrote hundreds of poems about it.

The Chinese exploring moon project, named after Chang’e,【小题9】expresses this pursuit（追求）of the Chinese. The successful launch of Chang’e 1 not only【小题10】the groundwork（基础）for future exploration of the moon, but also made a long-held dream of the Chinese people come true.

Our earth gets its warmth and light 【小题1】. The sun is a huge blazing（酷热的）ball, a million times 【小题2】 the earth. And it is millions of miles away. The earth spins（旋转） round once every 24 hours. It turns to face the sun and spins away every 24 hours.

When our part of the earth looks on to the sun, we see sunlight and we 【小题3】. When our part turns away from the light, we have night.

When our part begins to turn 【小题4】 and we see the first sunlight, we call it morning.

When we are facing the sun most directly, it is noon. Then the sun is closest to begin straight（直接地）above us. When we begin to 【小题5】 from the sun, we have afternoon, evening and night.