In 1940, four teenage boys and their dog were walking through the woodland close to Lascaux when their dog suddenly disappeared. The boys searched all around. They came to a cave and looked into the cave 【小题1】 could see nothing.

A few days later, the boys returned to the cave. They could hardly believe 【小题2】 (they) eyes. In the weak lamplight, the boys saw red horses and cows, and black bulls and deer covering the walls of the cave, which looked so 【小题3】 (frighten) that the boys escaped in fear. Little did the boys know that they had made one of the most important 【小题4】 (discover) of that century.

The famous Lascaux Cave is made up of a large hole and 【小题5】 series of connecting caves, with a natural water system. The paintings there are an especially important find because they are so numerous and so well protected. After a few years, the caves were opened 【小题6】 a tourist attraction, and 1,200 people per day came to the site 【小题7】 (admire) the paintings. 【小题8】 (fortunate) , a large number of visitors resulted in changes in the caves’ atmosphere, and green algae (藻类植物) began to grow around the walls. Since then, the caves 【小题9】 (close) to the public in an effort to protect the fragile paintings in this precious underground site.

Today, the caves have computer-controlled air-conditioning and are inspected daily. Scientists hope that these precautions (预防措施) can prevent any 【小题10】 (far) damage to the paintings.