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北京昼夜温差最大的季节是( )P8
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北京地区最低海拔点的海拔为( )。P2
现在的通惠河的起止点分别是( )。P6
密云水库的总库容量是( )亿立方米。P5
Some people have very good memories and can easily learn quite a long paragraph by heart. But they often forget them almost as quickly as they learn them. There are other people who can only remember things when they have said them over and over, but when they do know them they don’t forget them.The human mind is rather like a camera, but it takes photographs not only of what we see but of what we feel, hear or smell. There is much to do before the photograph is finished and ready to show to our friends. In the same way, there is much work to be done before we can make a picture remain forever in the mind. Some people can easily learn things but they （）them easily, too.
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