El Abbasa (Sweet Water) Canal______from River Nile at Cairo to Suez Canal at Ismaili.A.extendB.extendingC.are extendingD.extends

The canal must be wide enough to permit two of the largest boats using it to pass each other easily.It must be deep enough to leave about two feet of water（ ）the keel of the largest boat using the canal.

A.down
B.below
C.beneath
D.off

共用题干
第二篇

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 BC.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 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 be 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."

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.

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 BC.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."

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 and the Blue Nile are branches of the River Nile.

共用题干
Water

From the beginning,water has furnished man with a source of food and a highway to travel upon.The first civilization arose(51)________water was a dominant element in the environment,a challenge(52)______man's ingenuity.The Egyptians invented the 365一day calendar in response to the Nile's annual flooding. The Babylonians,(53)________were among the most famous lawmakers in ancient times,invented laws(54)_________ water usage.Water inspired the Chinese to build a 1,000-(55)________canal,a complex system which,after nearly 2,500 years,remains still practically(56)_______ and still commands the astonishment of engineers.But (57)_________never found complete solutions to their water problems.The Yellow River is also known as "China's Sorrow" ;it is so unpredictable and dangerous(58)_________in a single flood it has caused a million(59)________.Floods slowed the great(60)_________of the Indus River Valley,and inadequate drainage ruined (61)________of its land. Today water dominates man (62)_______it always has done.Its presence continues to(63)________the location of his homes and cities;its violent variability can(64)________man or his herds or his crops;its routes links him(65)________his fellows;its immense value may add to already dangerous political conflicts.There are many examples of this in our own time.

_________(51)
A:where
B:the place
C:when
D:in the place