下面的短文有5处空白，短文后有6个句子，其中5个取自短文，请根据短文内容将其分别放回原有位置，以恢复文章原貌。 The Building of the Pyramids
The oldest stone buildings in the world are the pyramids. (46)
There are over eighty of them scattered along the banks of the Nile,
some of which are different in shape from the true pyramids. The most famous of
these are the "Step" pyramid and the "Bent" pyramid. 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 damage suffered by the others has been at
the hands of men who were looking for treasure or, more often, for stone to use
in modem buildings. (47) . These are good reasons why they
can still be seen today, but perhaps the most important is that they were
planned to last for ever. (48) . However, there are no
writings or pictures to show us how the Egyptians planned or built the pyramids
themselves. (49) . Nevertheless, by examining the actual
pyramids and various tools which have been found, archaeologists have formed a
fairly cleat picture of them. One thing is certain: there must
have been months of careful planning before they could begin to build.
(50) You may think this would have been easy with miles and
miles of empty desert around, but a pyramid could not be built just anywhere.
Certain rules had to be followed, and certain problems had to be
overcome. A. The dry climate of Egypt has helped to preserve the
pyramids, and their very shape have made them less likely to fall into
ruin. B. It is practically certain that plans were made for the
building of the pyramid because the plans of other large works have fortunately
been preserved. C. The first thing they had to do was to choose
a suitable place. D. Consequently, we are only able to guess at
the methods used. E. Many people were killed while building the
pyramids. F. They have stood for nearly 5,000 years, and it
seems likely that they will continue to stand for thousands of years yet.