题目内容
Where Did All the Ships Go？
The Bermuda Triangle (三角区) is one【51】 the greatest mysteries of the sea. In this triangular area between Florida, Puerto Rico and Bermuda in Atlantic, ships and airplanes【52】 to disappear more often than in【53】 parts of the ocean. And they do so【54】 leaving any sign of an accident or any dead bodies. It is【55】 that Christopher Columbus was the first person to record strange happenings in the area. His compass. stopped working, a flame came down from the sky, and a wave 100 to 200-feet-high carried his ship about a mile away.
The most famous disappearance in the Bermuda Triangle was the US Naval (海军的) Air Flight 19.【56】 December 5,1945, five bomber planes carrying 14 men【57】 on a training mission from the Florida coast. Later that day, all communications with Flight 19 were lost. They just disappeared without a trace.
The next morning, 242 planes and 19 ships took part in the largest air-sea search in history. But they found nothing.
Some people blame the disappearances【58】 supernatural (超自然的) forces, It is suggested the【59】 ships and planes were either transposed to other times and places kidnapped (绑架) by aliens (外星人)【60】 attacked by sea creatures.
There are【61】 natural explanations, though. The US Navy says that the Bermuda Triangle is one of two places on earth【62】 a magnetic compass (指南针) points towards true north【63】 magnetic north,【64】, planes and ships can lose their way if they don't make adjustments. The area also has changing weather and is known【65】 its high waves. Storms can turn up suddenly and destroy a plane or ship. Fast currents could then sweep away any trace of an accident.
(51)
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Ancient Egypt Brought Down by Famine
Even ancient Egypt's mighty pyramid (金字塔) builders were powerless in the face of the famine (饥荒) that helped bring down their civilization around 2180 B.C. Now evidence collected from mud deposited by the River Nile suggests that a shift in climate thousands of kilometers to the south was ultimately to blame—and the same or worse could happen today.
The ancient Egyptians depended on the Nile's annual floods to irrigate their crops. But any change in climate that pushed the African monsoons (季风) southwards out of Ethiopia would have reduced these floods.
Declining rains in the Ethiopian highlands would have meant fewer plants to stabilize the soil. When rain did fall it would have washed large amounts of soil into the Blue Nile and into Egypt, along with sediment (沉积) from the White Nile.
Blue Nile mud has a different isotope (同位素) 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 Blue Nile mud in the river would he relatively high. He found that one of these periods, from 4500 to 4200 years ago, immediately came before the fall of the Egypt's old Kingdom.
The weakened waters would have been disaster for the Egyptians. "Changes that affect food supply don't have to be very large to have a ripple (波浪) 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 scientist 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. "
Why does the author mention "Egypt's mighty pyramid builders"？
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