Some of the pyramids still look much the same as they must have done when they were built thousands of years ago.Most of the __4__ suffered by the others has been at the hands of men who were looking for treasure or，more often，for stone to use in modern buildings.The dry climate of Egypt has helped to __5__ the pyramids，and their very shape has made them less likely to fall into ruin.These are good reasons why they can still be seen today，but perhaps the most important is that they were __6__ to last for ever.

　　It is __7__ certain that plans were made for the building of the pyramids because the plans of other large works have __8__ been preserved.However，there are no __9__

　　or pictures to show us how the Egyptians planned or built the pyramids themselves.Consequently，we are only able to __10__ at the methods used.However，by examining the actual pyramids and various tools which have been found，archaeologists have __11__ a fairly clear picture of them.

　　One thing is certain: there must have been months of

　　__12__

　　planning before they could begin to build.The first thing they had to do was to choose a

　　__13__ place.You may think this would have been __14__ with miles and miles of empty desert around，but a pyramid could not be built just anywhere.Certain rules had to be

　　__15__，and certain problems had to be overcome.

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