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 meters 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 kilometers 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.

The newspaper did not mention the degree of the damage caused by the fire. range level extent quantity

Shelly had prepared carefully for her biology examination so that she could be sure of passing it on her first endeavor. intention attempt purpose desire

They bought the land in order to build a new office block. with a purpose to with a view to with a goal to with a reason to

She can speak French and German, let alone English. to say nothing of to speak nothing of to talk nothing of to tell nothing of

Some people would like to do shopping on Sundays since they expect to pick up wonderful articles in the market. batteries bargains baskets barrels

The tomato juice left a brown stain on the front of my jacket. track trace spot point

A peculiarly pointed chin is his most memorable facial characteristic. mark feature trace appearance

The manager got angry just because his secretary was ten minutes late. lost his mood lost his temper lost his mind lost his passion

Scotland: A Land of Wisdom In the 1740s, the famous French philosopher Voltaire said “We look to Scotland for all our ideas of civilization. “That’s not a bad advertisement for any country when it comes to attracting people to search for a first-class education. According to the American author Arthur Herman, the Scots invented the modern world itself. He argues that Scottish thinkers and intellectuals worked out many of the most important ideas on which modern life depends—everything from the scientific method to market economics. Their ideas did not just spread among intellectuals, but to those people in business, government and the sciences who actually shaped the Western world. It all started during the period that historians call the Scottish Enlightenment(启蒙运动), which is usually seen as taking place between the years 1740 and 1800. Before that, philosophy was mainly concerned with religion. For the thinkers of the Scottish Enlightenment, the proper study of humanity was mankind itself. Their reasoning was practical. For the philosopher David Hume, humanity was the right subject for philosophy because we can examine human behavior and so find real evidence of how people think and feel. And from that we can make judgments about the societies we live in and make concrete suggestions about how they can be improved, for universal benefit. Hume’s enquiry into the nature of knowledge laid the foundations for the scientific method— the pursuit of truth through experiment. His friend and fellow resident of Edinburgh, Adam Smith, famously applied the study of mankind to the ways in which mankind does business. Trade, he argued, was a form of information. In pursuing our own interests through trading in markets, we all come to benefit each other. Smith’s idea has dominated modern views of economics. It also has wide applications. He was one of the philosophers to point out that nations can become rich, free and powerful through peace, trade and invention. Although the Scottish Enlightenment ended a long time ago, the ideas which evolved at that time still underpin(构成......的基础)our theories of human exchange and enquiry. It also exists in Scotland itself in an educational tradition that combines academic excellence with orientation（方向）

A a lot of money B British people C morning D local people E national issues F local issues

The first navigational lights in the New World were probably lighthouses hung at harbor entrances. The first lighthouse was put up by the Massachusetts Bay Colony in 1716 on Little Brewster Island at the entrance to Boston Harbor. Paid for and maintained by “ light dues“ levied(征收)on ships, the original beacon was blown up in 1776. Until then there were only a dozen or so true lighthouses in the colonies. Litde over a century later, there were 700 lighthouses. The first eight lighthouses erected on the West Coast in the 1850s featured the same basic New England design: a Cape Cod dwelling with the tower rising from the center or standing close by. In New England and elsewhere, though, lighthouses reflected a variety of architectural styles. Since most stations in the Northeast were set up on rocky eminences(高处), enormous towers were not the rule. Some were made of stone and brick, others of wood or metal. Some stood on pilings or stilts; some were fastened to rock with iron rods. Farther south, from Maryland through the Florida Keys, the coast was low and sandy. It was often necessary to build tall towers there— massive structures like the majestic lighthouse in Cape Hatteras, North Carolina, which was lit in 1870. 190 feet high, it is the tallest brick lighthouse in the country. Not withstanding differences in construction appearance, most lighthouses in America shared several features: a light, living quarters, and sometimes a bell(or, later, a foghorn). They also had something else in common: a keeper and usually the keeper’s family. The keeper’s essential task was trimming the lantern wick(灯芯)in order to maintain a steady, bright flame. The earliest keepers came from every walk of life, they were seamen, farmers, mechanics, rough mill hands and appointments were often handed out by local customs commissioners as political plums. After the administration of lighthouse was taken over in 1852 by the United States Lighthouse Board, and agency of the Treasury Department, the keeper corps gradually became highly professional.

In previous times, when fresh meat was inadequate, pigeons were kept by many households as a source of food. in short store in short provision in short reserve in short supply

Professor Taylor’s talk has indicated that science has a very strong influence on the everyday life of non-scientists as well as scientists. motivation perspective impression impact

I catch a cold now and then. always occasionally constantly regularly

Housewives who do not go out to work often feel they are not working to their full ability. capacity strength length possibility

Please give my best wishes to your family. notice attention regards cares

A complete change in policy is needed if relations are ever to improve. strict wide ever radical

At the meeting both sides exchanged their views on a wide scope of topics they were interested in. extent number collection range

Local Newspapers in Britain 1 Britain has a large circulation(发行量)of the national newspapers. The Daily Mirror and The Daily Express both sell about 4 million copies each day. On average, every family will buy one newspaper in the morning, and take two or three on Sundays. 2 Local newspapers are just as popular as the national ones in Britain. Local papers have a weekly circulation of 13 million. Nearly every town and country area has its own paper, and almost every local paper is financially holding its own. Many local newspapers are earning good profits. 3 Local newspapers have their special characteristics. They mainly satisfy interest in local e-vents—births, weddings, deaths, council meetings, and sports. Editors often rely on a small staff of people who know the district well. Clubs and churches in the neighborhood regularly supply these papers with much local news. Local news does not get out of date as quickly as national news. If there is no room for it in this week’s edition, a news item can be held over until the following week. 4 The editor of a local newspaper never forgets that the success of any newspaper depends on advertising. For this reason, he is keen to keep the good will of local businessmen. If the newspaper sells well with carefully chosen news items to attract local readers, the businessmen will be grateful to the paper for the opportunity of keeping their products in the public eye. 5 Local newspapers seldom comment on problems of national importance, and editors rarely take sides on political questions. But they can often provide service to the community in expressing public feeling on local issues. A newspaper can sometimes persuade the council to take action to improve transport, provide better shopping facilities, and preserve local monuments and places of interest. A Keeping Good Relations with Local Businessmen B Service Provided by Local Newspapers C Large Circulation of the National Newspapers D Special Features of Local Newspapers E Power of Local Newspapers F Popularity of Local Newspapers

What does “clear-air turbulence“ in Paragraph 1 probably mean?

In December 1997, a United Airlines flight hit unexpected rough air, ______.

The turbulence detector can tell the severity of the turbulence by measuring______.

We can infer from the fifth paragraph that______.

The last paragraph tells us, among other things, that______.