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te Nile.
　　The Blue Nile mud has a different isotope signature from that of the White Nile. So by analyzing isotope differences in mud deposited in the Nile Delta, Michael Krom of leeds University worked out what proportion of sediment came from each branch of the river.
　　Krom reasons that during periods of drought, the amount of the Blue Nile mud in the river would be relatively high. He found that one of these periods, from 4,500 to 4,200 years ago, immediately predates the fall of the Egypts Old Kingdom.
　　The weakened waters would have been catastrophic for the Egyptians. Changes that affect food supply dont have to be very large to have a ripple effect 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, a geoarchaeologist 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 because the populations have increased dramatically.
　　1. Why does the author mention pyramid builders?
　　A. because they once worked miracles.( 职称英语考试网 www.yingyukaoshi.com )
　　B. because they were well-built
　　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 the fall of the civilization of ancient Egypt?
　　A. Change of climate
　　B. famine
　　C. food
　　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 Bile
　　C. The White Nile a branch of the Blue Nile
　　D. The White Nile and the Blue Nile are branches of the River Nile
　　4. According to Krom, Egypts Old Kingdom fell
　　A. immediately after a period of drought
　　B. immediately after a period of flood
　　C. just before a drought struck
　　D. just before a flood struck
　　5. The word devastating in the last paragraph could be best replaced by
　　A. frustrating
　　B. damaging
　　C. defeating
　　D. worrying
　　标准答案： D,A,D,A,B
　　解析：
　　22、
　　第五部分：补全短文(每题2分，共10分)阅读下面的短文，文章中有5处空白，文章后有6组文字，请根据文章的内容选择5组文字，将其分别放会文章原有位置，以恢复文章原貌。请将答案涂在答题卡相应的位置。
　　Agitated sunspots cause trouble
　　If the lights in your house keep flicking, blame frequent sunspots.
　　A sunspot is actually charged particles flying at the speed of 3 million kilometers an hour out of the surface of the sun to form sun storms.
　　__1__.
　　The earth, which is directly energized by the sun, is influenced by sun storms in a number of ways.
　　__2__. Wireless short-wave communication, which depends on the wave's reflection against this layer of atmosphere, is likely to be jammed. It is said that mobile phone communication may be affected too.
　　__3__. According to a research conducted by the Russian scientists from 1957 to 1960, the frequency of earthquake can be linked to the movement of the sunspots.
　　Though little research has been carried out about how exactly the sunspot will negatively harm the health of the people, a paper published by a North Korea observatory says that sun storms may cause an increase in the incidence of heart disease and skin disease.__4__.
　　Besides, the nervous system is also affected, and traffic accidents are more frequent when sunspot