题目内容
（请给出正确答案）
In December 1997, a United Airlines flight hit unexpected rough air,
A．causing a lot of damage to the plane.
B．throwing its passengers out of the cabin.
C．resulting in heavy casualties.
D．forcing the pilot to make an emergency landing.
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更多“In December 1997, a United Air…”相关的问题
In December 1997, a United Airlines flight hit unexpected rough air,
A．causing a lot of damage to the plane.
B．throwing its passengers out of the cabin.
C．resulting in heavy casualties.
D．forcing the pilot to make an emergency landing.
In December 1997, a United Airlines flight hit unexpected rough air.
A．causing a lot of damage to the plane.
B．throwing its passengers out of the cabin.
C．resulting in heavy casualties.
D．forcing the pilot to make an emergency landing.
In December 1997, a United Airlines flight hit unexpected rough air,
A．causing a let of damage to the plane.
B．throwing its passengers out of the cabin.
C．resulting in heavy casualties.
D．forcing the pilot to make an emergency landing.
Write a letter about 100-120 words advising your customer to settle his accounts as soon as possible.
Global Warming
At the Kyoto conference on global warming in December 1997, it became abundantly clear how complex it has become to work out international agreements relating to the environment because of economic concerns unique to each country. It is no longer enough to try to forbid certain activities or to reduce emissions of certain substances. The global challenges of the interlink between the environment and development increasingly bring us to the core of the economic life of states. During the late 1980s we were able, through international agreements, to make deep cuts in emissions harmful to the ozone layer, These reductions were made possible because substitutions had been found for many of the harmful chemicals and, more important, because the harmful substances could be replaced without negative effects on employment and the economies of states.
Although the threat of global warming has been known to the world for decades and all countries and leaders agree that we need to deal with the problem, we also know that the effects of measures, especially harsh measures taken in some countries, would be nullified (抵消) if others countries do not control their emissions. Whereas the UN team on climate change has found that the emissions of carbon dioxide would have to be cut globally by 60% to stabilize the content of CO2 in the atmosphere, this path is not feasible for several reasons. Such deep cuts would cause a breakdown of the world economy. Important and populous (人口众多的) low—or medium-income countries are not yet willing to undertake legal commitments about their energy uses. In addition, the state of world technology would not yet permit us to make such a big leap.
We must, however, find a solution to the threat of global warming early in the 21st century. Such a commitment would require a degree of shared vision and common responsibilities new to humanity. Success lies in the force of imaginations, in imagining what would happen if we fail to act. Although many living in cold regions would welcome the global-warming effect of a warmer summer, few would cheer the arrival of the subsequent diseases, especially where there had been none.
The main purpose of this passage is to______.
A．convince people that global warming is a real threat
B．criticize some countries for refusing to cut down emissions harmful to the ozone layer
C．analyze the problem of global warming
D．argue against making deep cuts in emissions
El Nino
While some forecasting methods had limited success predicting the 1997 El Nino a few months in advance, the Columbia University researchers say their method call predict large El Nino events up to two years in advance. That would be good news for governments, farmers and others seeking to plan for the droughts and heavy rainfall that El Nino can produce in various parts of the world.
Using a computer the researchers matched sea-surface temperatures to later El Nino occurrences between 1980 and 2000 and were then able to anticipate El Nino events dating back to1857, using prior sea-surface temperatures. The results were reported in the latest issue of the journal Nature.
The researchers say their method is not perfect, but Bryan C. Weare. a meteorologist at the University of California, Davis, who was not involved in the work, said it "suggests'El Nino is indeed predictable.'"
"This will probably convince others to search around more for even better methods." said Weare. He added that the new method "makes it possible to predict El Nino at long lead.times." Other models also use sea-surface temperatures, but they have not looked as far back because they need other data, which is only available for recent decades, Weare said.
The ability to predict the warming and cooling of the Pacitic is of immense importance. The 1997 El Nino, for example, caused an estimated $ 20 billion in damage worldwide, offset by beneficial effects in other areas, said David Anderson, of the European Centre for Medium Range Weather Forecasts in Reading England. The 1877 El Nino, meanwhile, coincided with a failure of the Indian monsoon and a famine that killed perhaps 40 million in India and China, prompting the development of seasonal forecasting, Anderson said.
When El Nino hit in 1991 and 1997, 200 million people were affected by flooding in China alone, according to a 2002 United Nations report.
While predicting smaller El Nino events remains tricky, the ability to predict larger ones should be increased to at least a year if the new method is confirmed.
El Nino tends to develop between April and June and reaches its peak between December and February. The warming tends to last between 9 and 12 months and occurs every two to seven years
The new forecasting method does not predict any major El Nino events in the next two years, although a weak warming toward the end of this year is possible.
El Ninon. 厄尔尼诺现象
equatorial adj.赤道的
occurrence n. 发生
meteorologist n.气象学家
offset v. 抵销
lead adj. 提前的
monsoon n.季风
tricky adj.难以捉摸的
The method used by the Columbia University researchers can predict El Nino a few months in advance.
A．Right
B．Wrong
C．Not mentioned
听力原文： After the death of my grandfather, I got the genealogy bug. It started with the gathering of family photos and progressed to writing a family history. Several years ago, I took another step and began creating a Website for the Stovalls. During this initiative, I also pursued the Wallace, Cox, Raney, and other related family lines.
One day I received an email about the Wallace line from a fellow named Ron Ritchie. Although I lived in Birmingham, Alabama, and he lived in Dallas, Texas, he had some Wallaces from the same area from which mine originated. We corresponded several times, after which he passed the baton to his daughter, Connie. She emailed me, and after six months or so, we reached the conclusion that we were not related.
With no more data to work on, we chatted about other interests and one thing led to another. The end result？ This shy Alabama-born boy found himself flying to Dallas to meet a girl. During several subsequent trips, we explored the sights, met each other's families, and plotted our lives. In December of 1997, my genealogical penpal and I were married. Our search for roots had led instead to a fresh branch on our now combined family tree. I think it's only fair to give our ancestors the credit!
When did I begin my genealogy research？
A．After the death of my father.
B．After the death of my grandfather.
C．After the death of my mother.
D．After the death of my grandmother.
El Nino
While some forecasting methods had limited SUCCESS predicting the 1997 E1 Nino a few months in advance．the Columbia University researchers say their method call predict large E1 Nino events up to two years in advance．That Would be good news for governments，farmers and others seeking to plan for the droughts and heavy rainfall that El Nino can produce in various parts of the world．
Using a computer the researchers matched sea-surface temperatures to later El Nino occurrences between 1980 and 2000 and were then able to anticipate El Nino events dating back to 1857，using prior sea-surface temperatures．The results were reported in the latest issue of the journal Nature．
The researehers say their method is not perfect，but Bryan C．Weare．a meteorologist at the University of California．Davis,who was not involved in the work，said it“suggests‘E1 Nino is indeed predictable．”
“This will probably convince others to search around more for even hetter methods．”said Weare.He added that the new method“makes it possible to predict El Nino at long lead times．”0ther models also use sea-surfaee temperatures，but they have not looked as far back because they need other data，which is only available for recent decades，Weare said．
The ability to predict the warming and cooling of the Pacitic is of immense importance’．The l997 El Nino，for example，caused an estimated $20 billion in damage worldwide，offset by beneficial effects in other areas，said David Anderson，of the European Centre for Medium．Range Weather Forecasts in Reading England．The 1877 El Nino，meanwhile，coincided with a failure of the Indian monsoon and a famine that killed perhaps 40 million in India and China.prompting the development of seasonal forecasting，Anderson said．
When El Nino hit in 1991 and 1997．200 million people were affected hy flooding in China alone．according to a 2002 United Nations report．
While predicting smaller E1 Nino events remains tricky．the ability to predict larger ones should be inereased to at least a year if the new method is confirmed．
El Nino tends to develop between April and June and reaches its peak between December and February．The warming tends to last between 9 and 12 months and occurs every two to seven years．
The new forecasting method does not predict any major E1 Nino events in the next two years，although a weak warming toward the end of this year is possible．
第 22 题 The method used by the Columhia University researchers can predict E l Nino a few months in advance．
A．Right
B．Wrong
C．Not mentioned
Please Fasten Your Seatbelts
Severe turbulence (湍流) can kill aircraft passengers. Now, in test flights over the Rocky Mountains; NASA (美国航空航天局) engineers have successfully detected clear-air turbulence up to 10 seconds before an aircraft hits it.
Clear-air turbulence often catches pilots by surprise. Invisible to radar, it is difficult to forecast and can hurl (用力抛出去) passengers about the cabin. In December 1997, one passenger died and a hundred others were injured when unexpected rough air caused a United Airlines flight over the Pacific to drop 300 metres in a few seconds.
However, passengers can avoid serious injury by fastening their seatbelts. "It is the only antidote (对策) for this sort of thing," says Rod Bogue, project manager at NASA's Dryden Flight Research Center in Edwards, California.
The centre's new turbulence detector is based on lidar, or laser radar. Laser pulses are sent ahead of the plane and these are then reflected back by particles in the air. The technique depends on the Doppler effect. The wavelength of the light shifts according to the speed at which the particles are approaching. In calm air, the speed equals the plane's airspeed. But as the particles swirl (打漩) in rough air, their speed of approach increases or decreases rapidly. The rate of change in speed corresponds to the severity (激烈程度) of the turbulence.
In a series of tests that began last month, a research jet flew repeatedly. into disturbed air over the mountain ridges (山脉) near Pueblo, Colorado. The lidar detector spotted turbulence between 3 and 8 kilometres ahead, and its forecasts of strength and duration corresponded closely with the turbulence that the plane encountered.
Bogue says that he had "a comfortable amount of time" to fasten his seatbelt. The researchers are planning to improve the lidar's range with a more powerful beam. The system could be installed on commercial aircraft in the next few years.
What does "clear-air turbulence" probably mean？ (Paragraph 1)
A．A not very rough storm.
B．Unexpected disturbed air.
C．A kind of visible storm.
D．A storm over mountain ridges.
Please Fasten Your Seatbelts
Severe turbulence (湍流) can kill aircraft passengers. Now, in test flights over the Rocky Mountains, NASA (美国航空航天局) engineers have successfully detected clear-air turbulence up to 10 seconds before an aircraft hits it.
Clear-air turbulence often catches pilots by surprise. Invisible to radar, it is difficult to forecast and can hurl (用力抛出去) passengers about the cabin. In December 1997, one passenger died and a hundred others were injured When unexpected rough air caused a United Airlines flight over the Pacific to drop 300 metres in a few seconds.
However, passengers can avoid serious injury by fastening their seatbelts. "It is the only antidote (对策) for this sort of thing," says Rod Bogue, project manager at NASA's Dryden Flight Research Center in Edwards, California.
The centre's new turbulence detector is based on lidar, or laser radar. Laser pulses are sent ahead of the plane and these are then reflected back by particles in the air. The technique depends on the Doppler effect. The wavelength of the light shifts according to the speed at which the particles are approaching. In calm air, the speed equals the plane's airspeed. But as the particles swirl (打漩) in rough air, their speed of approach increases or decreases rapidly. The rate of change in speed corresponds to the severity(激烈程度) of the turbulence.
In a series of tests that began last month, a research jet flew repeatedly into disturbed air over the mountain ridges (山脉) near Pueblo, Colorado. The lidar detector spotted turbulence between 3 and 8 kilometres ahead, and its forecasts of strength and duration corresponded closely with the turbulence that the plane encountered.
Bogus. says that he had "a comfortable amount of time" to fasten his seatbelt. The researchers are planning to improve the lidar's range with a more powerful beam. The system could be installed on commercial aircraft in the next few years.
第 36 题 What does "clear-air turbulence" probably mean？ (Paragraph 1)
A．A not very rough storm.
B．Unexpected disturbed air.
C．A kind of visible storm.
D．A storm over mountain ridges.
