Leonardo da Vinci was a great artist．He lived in 　　1　　 in the fifteenth and sixteenth centuries．He painted some of 　　2　　 pictures in the world．Mona Lisa is a good example of his works．He 　　3　　 painting Mona Lisa in 1503．

　　Da Vinci loved science and 　　4　　．He used darkness and light in a clever way in the painting．And a person can 　　5　　 see that there is a lot of geometry(几何学)in Mona Lisa．The face of Mona Lisa is 　　6　　 many circles and round shapes like balls．Even her 　　7　　 can be seen as a small part of a large circle．

　　The woman in the painting is 　　8　　 on a balcony(阳台)? and mountains can be seen behind her．Da Vinci loved to study rocks and mountains, 　　9　　 we can see these in his other paintings．

　　The woman is sitting with her knees to the side．He hands are held together 　　10　　 her．This way of sitting is now used by many artists when they are painting a picture of a man or woman．

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根据短文内容选择可以填入空白处的最佳答案。(Choose the best answers to complete the passage．)

　　A long time ago, it was not easy to 　　1　　 around．Then we built ships．We made horses pull goods．We 　　2　　 bicycles, cars, trains and other means of transportation．We made all these things, so travelling became 　　3　　．

　　But we did not stop there．We looked 　　4　　 in the sky and wanted to fly like birds．So we made hot air balloons and gliders．　　5　　, the Wright brothers built the first airplane about 100 years ago．Ever since then, travelling 　　6　　 even easier!

　　But we still did not stop there．We looked up in the sky again and wanted to visit other planets．We wanted to know 　　7　　 the universe was like．We had 　　8　　 questions．We would not have any answers 　　9　　 we could travel in space．So we began trying．

　　　　10　　 fifty years ago, both the U．S．and Russia wanted to be the first country 　　11　　 people to space．Russia won．In April of 1961, Russia sent a craft to space．Yuri Gagarin flew the craft．He became the first person to see the Earth from space．He circled 　　12　　 the Earth once．The flight 　　13　　 1 hour and 48 minutes．The following month, the U．S．sent its first craft to space．Alan Shepard flew the craft．He did not circle around the Earth．He was only in space 　　14　　 15 minutes．

　　In the next several years, the U．S．and Russia continued the space race．

　　Russia won many more times．For example, Russia sent the first woman to space in June of 1963．Two years 　　15　　, Alexei Leonov from Russia became the first person to walk in space．

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阅读下面的短文，从A、B、C、D四个选项中选出能填入空白处的最佳答案。

　　Once, a circle lost a piece of its own．The circle wanted to be whole, so it went around, looking for its 　　1　　 piece．But because it was not complete, it could only roll(滚)very slowly．It enjoyed the flowers and the sunshine 　　2　　 the way．It talked with worms．It found lots of different pieces, but 　　3　　 of them fit．So it left them all by the side of the road and kept on 　　4　　 for the lost piece．Then one day the circle found a piece that fit 　　5　　．The circle put the piece into 　　6　　．It could be whole with nothing lost．It was so happy and began to roll．As it was a perfect circle, it could roll very fast, too fast to see flowers or talk to worms．It realized how different the world was when it rolled so quickly．It felt so sad 　　7　　 it stopped, left its found piece by the side of the road and rolled very slowly．

　　Sometimes we are perfect when we lose something．A man who 　　8　　 everything is poor in some ways．He will never have hopes, dreams or something 　　9　　．He will never know someone loves him or someone is giving him something he has always wanted or never had．

　　We couldn't be perfect．But we must be brave enough to love, strong enough to forgive, kind enough to share 　　10　　 with others and clever enough to know there is enough love around us and then we can always have a wonderful time in our life．

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