the pilot reverses the engines thrust. Starry claims his redesigned wheels and C. the Starport runways would control aircraft in some ways runways could reduce the amount of fuel required for landing by about 25 percent- the new design would eventually facilitate environmental protection ving as much as 300 million gallons annually at an airport the size of Denver'si facility, which will open in late 1994 with 84 gates. The reduced fuel consumption TEXTB would also improve air quality. Noise pollution would decrease too, because on A weather map is an important tool for geographers. A succession of three or takeoff planes could coast 10.000 feet before switching to full thrust. four maps presents a continuous picture of weather changes. Weather forecasters are A Starport would require less land than conventional designs like 53-square-mile airport But although airport planners are reviewing his concept, none whether ass is retaining its original characteristics or taking on those of the has yet been willing to build and test a Starport prototype surface over which it is moving. Thus, a most significant function of the map is to 51. While aircraft have gone through enormous changes reveal an synoptic picture of conditions in the atmosphere at a given time A airport have also taken on striking new looks. All students of geography should be able to interpret a weather map accura B. a revolution has begun in airport design, with the starport being the first of eather maps contain an enormous amount of information about weather conditions existing at the time of observation over a large geographical area They reveal in a C. Airports have remained relatively unchanged few minutes what otherwise would take hours to describe the United States Weather D. Runways today are the same as they were when the Wright brothers took Bureau issues information about approaching storms, floods, frosts, droughts and all climate conditions in general. Twice a month it issues a 30-day"outlook" which is a 52. The reduced fuel consumption by 25 percent would be possible only rough guide to weather conditions likely to occur over broad areas of the United States. These outlooks are based on an analysis of the upper air levels A. with slopping runways With the use of electronic instruments and satellites, enormous gains have taken B. with the turbine turmed off on the grour place recently in identifying and tracking storms over regions which have but few C. with plane wheels generating electricity for sliding meteorological stations. Experiments are also in progress for weather modification D. with Starry's redesigned runways and brake-accelerator wheels studies, although few successful results such as artificial rainmaking have been 53. All but one of the following are true of the Starport The exception is achieved so far 54. One characteristic of weather maps not mentioned in this passage is A. for all the benefits brought about by the Starport, the reinvented runways A fronts B temperature change C wind speed D frost should receive all the credit 55. The thirty-day forecast is made by examining B. the Starport would look different from conventional airports in shape A. daily weather maps4 the pilot reverses the engines’ thrust. Starry claims his redesigned wheels and runways could reduce the amount of fuel required for landing by about 25 percent--- saving as much as 300 million gallons annually at an airport the size of Denver’s new facility, which will open in late 1994 with 84 gates. The reduced fuel consumption would also improve air quality. Noise pollution would decrease too, because on takeoff planes could coast 10,000 feet before switching to full thrust. A Starport would require less land than conventional designs like Denver’s new 53-square-mile airport. But although airport planners are reviewing his concept, none has yet been willing to build and test a Starport prototype. 51. While aircraft have gone through enormous changes, __________. A. airport have also taken on striking new looks. B. A revolution has begun in airport design, with the Starport being the first of its kind C. Airports have remained relatively unchanged D. Runways today are the same as they were when the Wright brothers took flight 52. The reduced fuel consumption by 25 percent would be possible only _________. A．with slopping runways B．with the turbine turned off on touching the ground C．with plane wheels generating electricity for sliding D．with Starry’s redesigned runways and brake-accelerator wheels 53. All but one of the following are true of the Starport. The exception is __________. A．for all the benefits brought about by the Starport, the reinvented runways should receive all the credit B．the Starport would look different from conventional airports in shape C．the Starport runways would control aircraft in some ways D．the new design would eventually facilitate environmental protection TEXT B A weather map is an important tool for geographers. A succession of three or four maps presents a continuous picture of weather changes. Weather forecasters are able to determine the speed of air masses and fronts. They are also able to determine whether an air mass is retaining its original characteristics or taking on those of the surface over which it is moving. Thus, a most significant function of the map is to reveal an synoptic picture of conditions in the atmosphere at a given time. All students of geography should be able to interpret a weather map accurately. Weather maps contain an enormous amount of information about weather conditions existing at the time of observation over a large geographical area. They reveal in a few minutes what otherwise would take hours to describe. The United States Weather Bureau issues information about approaching storms, floods, frosts, droughts and all climate conditions in general. Twice a month it issues a 30-day “outlook”which is a rough guide to weather conditions likely to occur over broad areas of the United States. These outlooks are based on an analysis of the upper air levels. With the use of electronic instruments and satellites, enormous gains have taken place recently in identifying and tracking storms over regions which have but few meteorological stations. Experiments are also in progress for weather modification studies, although few successful results such as artificial rainmaking have been achieved so far. 54. One characteristic of weather maps not mentioned in this passage is __________. A. fronts B. temperature change C. wind speed D. frost 55. The thirty-day forecast is made by examining __________. A. daily weather maps B. upper air levels