[不定项选择题]共用题干 Egypt Felled by Famine
Even ancient Egypt's mighty pyramid builders were powerless in the face of the famine that helped bring down their civilization around 2180 B C.Now evidence gleaned（搜集）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 diminished these floods.
Dwindling（使减少）rains in the Ethiopian highlands would have meant fewer plants to establish the soil.When rain did fall it would have washed large amounts of soil into the Blue Nile and into Egypt,along with sediment（沉积物）from the White Nile.
The 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 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 predated 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（天文台）in New York.
"Similar events today coald be even more devastating,"says team member Daniel Stanley,a geoarchaeologist from the Smithsonian Institution in Washington, D.0."Anything humans do to shift the climate belts woulld have an even worse effect along the Nile system because the populations have increased dramatically." The word"devastating"in the last paragraph could be best replaced by______.
A.frustrating
B.damaging
C.defeating
D.worrying

[不定项选择题]共用题干 Egypt Felled by Famine
Even ancient Egypt's mighty pyramid builders were powerless in the face of the famine that helped bring down their civilization around 2180 B C.Now evidence gleaned（搜集）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 diminished these floods.
Dwindling（使减少）rains in the Ethiopian highlands would have meant fewer plants to establish the soil.When rain did fall it would have washed large amounts of soil into the Blue Nile and into Egypt,along with sediment（沉积物）from the White Nile.
The 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 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 predated 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（天文台）in New York.
"Similar events today coald be even more devastating,"says team member Daniel Stanley,a geoarchaeologist from the Smithsonian Institution in Washington, D.0."Anything humans do to shift the climate belts woulld have an even worse effect along the Nile system because the populations have increased dramatically." According to Krom,Egypt's 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

[不定项选择题]共用题干 第三篇

Egypt Felled by Famine

Even ancient Egypt's mighty pyramid builders were powerless in the face of the famine that helped
bring down their civilization around 2180 B C. Now evidence gleaned（搜集）from mud deposited by the River
Nile suggests that a shift in climate thousands of kilometers to the south was ultimately to blame一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 diminished these
floods.
Dwindling（逐渐变少；使变少）rains in the Ethiopian highlands would have meant fewer plants to
establish 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；沉积物）from the White Nile.
The Blue Nile mud has a different isotope（同位素；核素）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 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 predated 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（天文台）in New York.
"Similar events today could be even more devastating,"says team member Daniel Stanley,a
geoarchaeologist（地质考古学家）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." The word"devastating"in the last paragraph could be best replaced by_______________.
A.frustrating
B.damaging
C.defeating
D.worrying

[不定项选择题]共用题干 A公司拟发行债券和股票筹资，原定方案为：筹资总额500万元，债券和普通股的资金成本率分别为10%和15%。两种筹资方式筹集的资金分别占筹资总额的40%和60%。根据以上资料，回答下列问题： 经预测，公司筹集到的资金年平均收益为50万元，则该筹资方案()。
A.可行
B.不可行
C.不完全可行
D.不能确定