阅读理解

　　New York City isn’t the biggest city in the world, but it is the biggest city in the United States．Most Americans live in much smaller cities and towns, but almost 8 million people live in New York City．Why did so many people come to live in one place?

　　A look at the city shows us that New York City has a very good port(商埠)The Dutch(荷兰)settlers(new comes), wanted to use it for business．In 1626, the Dutch paid(付钱)the Indians twenty-four dollars for the island of Manhattan．Its Dutch name was New Amsterdam．Then the British took the land in 1664 and changed its name to New York．

　　The Untied States became an independent(独立的)country in 1783 ,and New York was its capital for a short time．The city became so crowded that some people moved out to other areas(places)．But more people from everywhere went on coming into the city every day．

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阅读理解

　　Look at the centre circles of Diagram(图)A and Diagram B．Which of the centre circles looks larger?

　　In fact, they are exactly the same size．

　　Then look at the picture on the right．What do you see? A vase? Or two faces?Does the picture change quickly from one to the other again and again? Maybe or maybe not, but you can never see them at the same time．

　　“What's happening? Is something wrong with my eyes?” You may wonder at what you see．Don't worry．Here is how it goes：

　　When we look at things, our eyes send messages to our brains and then our brains interpret(解读)the information．However, sometimes our brains interpret the received information in a wrong way．It seems that our eyes are playing a joke on us．This often happens and we call it “visual illusion(视觉错误)”．

　　Movie makers often make use of visual illusions．They make the objects around actors much smaller or bigger than usual．This makes us believe that the actors are much larger or smaller than they usually are．The movies Jurassic Park and Honey I shrunk the kids just make use of visual illusions．

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