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　　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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完形填空

　　When you hear the word “scitentist”, what do you think of? Many people think scientist are people in clean white coats who work in labs．And some scientists do work in labs．But there are 　　1　　 scientist who work in woods and jungles．These scientists are called “animal behavior(行为)scientists”, and they study animals as they live in nature．

　　Why don’t these scientists catch animals and study them in zoos? The 　　2　　 is in the word “behavior”．Animals behavior scientists want to learn 　　3　　 animal behave in their wild homes．When animals live in cages(笼子)or in zoos, they do not act the same as they do when they are 　　4　　．They may fight 　　5　　 each other, or they may not eat, or they may not raise(抚养)their babies as they usually would．To see real animal behavior, scitentists must go where the animals 　　6　　．

　　So animal behavior scientists go into the jungles, the woods or the desert．There, their most important 　　7　　 are their eyes and ears．They watch and listen to the animals very 　　8　　．They write down everything that happened in notebook．　　9　　 they live near the animals, the scientists are careful not to frighten them．If the scientists are luncky, the animals will 　　１０　　 no attention to them．Then the scientists can see how the animals really live．

　　The behavior scientists hope what they’ve learned about animal behavoir can provide clues(提供线索)to help people learn to live together more happily．

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