题目内容
（请给出正确答案）
During the ______ farmers took all the troubles to irrigate their crops.
A．draught
B．naught
C．fraught
D．drought
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Why does Mann foresee stronger and more hurricanes in future Atlantic Ocean？
A．All other factors resulting in hurricanes were equal during the past 150 years or so.
B．A rising thermometer has pushed the number of hurricanes a year up to 15 in recent years.
C．Atlantic temperatures today have dropped to the lowest because La Nina events these years.
D．Atlantic temperatures today are even higher than temperatures in the Perfect Storm.
The Effects of Global Warming
Although the term “global warming” has become increasingly familiar to the general public, a recent survey carried out by the Chinchilla Institute for Environmental Studies clearly demonstrates that the full implications of the term are (51) understood. As long as public
(52) remains so low, the political measures required to deal with the (53) disastrous consequences are unlikely to come about.
Over 80 percent of the people interviewed in the Chinchilla Survey were unable to indicate any of the effects of a worldwide rise in temperature. (54) more disturbing was the very small (55) of people interviewed (7.4%)who felt that their lives would be directly (56) by global warming during the next 20 years.
This indifference is in sharp (57) to the concerns voiced by the team of professionals who conducted the Survey. Team leader professor Ernest Wong stated that we should all expect to (58) significant lifestyle. changes as a result of the effects of global warming. In (59) the likely effects, Professor Wong emphasized that the climatic changes caused by a rise in global temperature of only 1℃ would result in (60) changes.
Primary among these changes would be the rise in sea level as a (61) of the melting of the polar icecaps. The consequent 30-centimeter rise in sea levels would have disastrous consequences for lowly coastal areas. The very (62) of countries such as Bangladesh would be threatened. Indeed, (63) coastal cities would entirely escape severe flooding and damage. (64) considerable debate surrounds the accuracy of Professor Wong’s predictions, those who share his (65) prediction insist that governments must respond to this challenge by investing in coastal defense.
(51)
A．so far
B．by far
C．far from
D．far and away
Egypt Felled by Famine
Even ancient Egypts mighty pyramid builders were powerless in the face of the famine that helped bring down their civilian around 2180 BC.Now evidence gleaned from mud deposited by the River Nile suggests that a shift in climate thousands of kilometers to the south was ultimately to blem 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 amounts 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 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 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 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
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 civilization.
A.FA = -7.03kN，FB =FC =5.21kN；
B.FA = -5.64kN，FB =FC =4.57kN；
C.FA = -3.75kN，FB =FC =3.37kN；
D.FA = -2.81kN，FB =FC =4.23kN；
一对角接触球轴承（α=25°)反安装。已知：径向力FrⅠ=6750N，FrⅡ=5700N，外部轴向力FA=2000N，方向如图所示，两轴承的轴向力FaⅠ、FaⅡ分别为（）。 （注：内部轴向力Fs=0.68Fr)
A.由于轴承1压紧，FaⅠ=Fa+FsⅡ，FaⅡ= FsⅡ
B.由于轴承1压紧，FaⅠ= FsⅠ，FaⅡ= FsⅠ+Fa
C.由于轴承1压紧，FaⅠ= FsⅡ，FaⅡ= FsⅡ+Fa
D.由于轴承2压紧，FaⅠ= FsⅠ，FaⅡ= FsⅠ+Fa
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