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[主观题]

Most ancient ink slabs unearthed by archaeologists were made in the . A. B. C. D.

A、Zhou Dynasty

B、Wei Dynasty

C、Western Han Dynasty

D、the Southern and Northern Dynasties

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第1题

Egypt Felled by Famine

Even ancient Egypt's mighty pyramid builders were powerless in the face of the famine that helped bring down their civilisation around 2180 BC. Now evidence gleaned from mud deposited by the River Nile suggests that a shift in climate thousands of kilometres 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 southwards out of Ethiopia would have diminished these floods.

Dwindling rains in the Ethiopian highlands would have meant fewer plants to stablise the soil. When rain did fall it would have washed large mounts of soil into the Blue Nile and into Egypt, along with sediment from the White Nile.

The Blue Nile mud has a different isotope signature from that of the White Nile. So by analysing 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 fiver.

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 4,50Oto 4,200 years ago, immediately predates the fall of the Egypt's Old Kingdom.

The weakened waters would have been catastrophic for the Egyptians. "Changes that affect food supply don't 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 Institutions 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 "pyramid builders"?

A.Because they once worked miracles.

B.Because they were well-built.

C.Because they were actually very weak.

D.Because even they were unable to rescue their civilisation.

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第2题

【C20】

A.under the sun

B.in the sun

C.in the world

D.on the world

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第3题

What is implied in this passage?

A.The sun was worshiped by all the Chinese people.

B.The sun was thought of as a cock.

C.Chinese religion and astronomy were closely interrelated.

D.Sundials were first used by the Chinese.

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第4题

They stand ______.

A.under the sun

B.in the sun

C.over the sun

D.against the sun

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第5题

They stand______.

A.under the sun

B.in the sun

C.over the sun

D.against the sun

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第6题

A.Mow the lawn.

B.Wash the car.

C.Exercise in the sun.

D.None of these.

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第7题

A.sun

B.earth

C.way

D.plants

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第8题

【C9】

A.sun

B.moon

C.earth

D.planet

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第9题

【B9】

A.sun

B.moon

C.earth

D.planet

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第10题

【B4】

A.stars

B.sun

C.earth

D.space

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