阅读下面材料,在空白处填入1个适当的单词或括号内单词的正确形式。
Northwest China’s Ningxia Hui Autonomous Region has adopted digital technology 【小题1】 (preserve)ancient cliff(悬崖) carvings and paintings before their disappearance.
Workers have copied more than 2,000 immovable rock carvings and paintings at Helan Mountain to digitalize the overall views as well as 【小题2】 (they)accurate locations. The digital information will be sorted and-workers will conduct a disease analysis.
Rock carvings 【小题3】 (appear)before writing systems were invented. Now, more than 20, 000 cliff paintings and carvings 【小题4】 were created by the ancestors have been discovered at Helan Mountain. The works record the lives of the people who lived 3, 000 to 10, 000 years ago. In general, 【小题5】(image)of animals dominate(占主要地位), followed 【小题6】 humans, vehicles, plants, planets, fingerprints and abstract signs. The surfaces were 【小题7】(main)carved with stone or metal in the open air, 【小题8】(expose)to weather beaten.
The protection of rock paintings and carvings is a worldwide issue. At present, there is no 【小题9】(effect), naturally scientific and technological means to prevent their disappearance. Some experts have predicted that by the end of this century, 【小题10】 quarter of the world’s rock paintings will disappear completely.