答案：backgrounds　

　　10．解析：考查非谓语动词。be surprised to do sth.意为“吃惊地去做某事”，故用不定式形式。

　　答案：to find　

　　C

　　Near the town of Montignac in Southern France, visitors can find some of the most beautiful cave paintings in the world－the Lascaux Cave Paintings (拉斯科洞窟壁画)．

　　The history of these paintings is very interesting. Most caves are formed

　　__1__

　　nature under the ground, but some have entrances people can find. That's just what happened one day in 1940. Four boys were taking

　　__2__

　　walk in the woods near Montignac. As they walked along, one of them noticed an unusual rock.

　　__3__

　　they got closer, they found it wasn't a rock but an opening in the ground. This opening led to a cave, so they decided to have a look around it. The walls of the cave

　　__4__

　　(cover) with ancient art. The boys didn't know it, but the cave was the find of the century!

　　Over the years, many historians and artists came to study the art. They wanted to understand who painted the pictures and

　　__5__

　　they might mean. They soon realized some of the art indicated animals that were on Earth a long time ago. Many of the pictures also showed people

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