The weakened waters would have been disaster for the Egyptians.Changes that affect food supply dont have to be very large to have a rippleeffect in societies，says Bill Ryan of the Lamont Doherty Earth Observatory in New York.

　　Similar events today could be even more devastating，says team member Daniel Stanley.ascientist from the Smithsonian Institution in Washington D.C.Anything humans do to shift the climate belts would have an even worse effect along the Nile system today because the populations have increased dramatically.

　　1 Why does the author mention Egypts mighty pyramid builders?

　　A Because they once worked miracles.

　　B Because they were wellbuilt.

　　C Because they were actually very weak.

　　D Because even they were unable to rescue their civilization.

　　2 Which of the following factors was ultimately responsible for bringing down the civilization of ancient Egypt?

　　A Change of climate.

　　B Corrulption.

　　C flood.

　　D Population growth.

　　3 which of the following statements is true?

　　A The White Nile is the trunk of the River Nile.

　　B The White Nile is the trunk of the Blue Nile.

　　C The White Nile is a branch of the Blue Nile.

　　D The White Nile is a branch of the River Nile.

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