It'sabouttwohours’(fly)fromXi’antoBeijing.（2.0分）

A . A、singly B . B、apiece C . C、set D . D、sets

A．The storm so severe was B．So severe was the storm C．So the storm was severe D．Such was the storm severe

A．Berlin． B．Bangkok． C．Moscow．

A.fly-v* B.[fly].[v*] C.[fly].[v] D.fly-v

A little airplane has given new meaning to the term "going hyper. " The Hyper-X recently broke the record for air-breathing jet planes when it traveled at a hypersonic speed of seven times the speed of sound. That's about 5,000 miles per hour. At this speed, you'd get around the world -- flying along the equator (赤道) -- in less than 5 hours. The Hyper-X is an unmanned,experimental aircraft just 12 feet long. It achieves hypersonic (超音速的) speed using a special sort of engine known as a scramjet. It may sound like something from a comic book,but engineers have been experimenting with scramjets since the 1960s. For an engine to burn fuel and produce energy, it needs oxygen. A jet engine, like those on passenger airplanes, gets oxygen from the air. A rocket engine typically goes faster but has to carry its own supply of oxygen. A scramjet (紧急刹车) engine goes as fast as a rocket, but it doesn't have to carry its own oxygen supply. A scramjet's special design allows it to obtain oxygen from the air that flows through the engine. And it does so without letting the fast-moving air put out the combustion (燃烧) flames. However, a scramjet engine works properly only at speeds greater than five times the speed of sound. A booster rocket carried the Hyper-X to an altitude of about 100,000 feet for its test flight. The aircraft's record-beating flight lasted just 11 seconds. Although the little plane's self-powered flight lasted only 11 seconds, that brief journey on March 27 makes a major milestone on the way to a new breed of very fast airplanes, comments Werner J. A. Dahm of the University of Michigan in Ann Arbor. In the future, engineers predict, airplanes equipped with scramjet engines could transport cargo quickly and cheaply to the brink of space. Such hypersonic jets could potentially carry passengers anywhere in the world in just a few hours. Out of the three experimental Hyper-X aircrafts built for NASA, only one is now left. The agency has plans for another 11-second hypersonic flight, this time at 10 times the speed of the sound. The Hyper-X broke the record because A．it was the first air-breathing jet plane. B．it flew along the equator. C．it flew at speeds smaller than five times the speed of sound. D．it traveled at a supersonic speed.

A surprise for air travelers The strides made in satellite-communications technology in recent years are at last yielding benefits for air travelers, particularly executives who need to keep in touch with their offices. Five airlines— three of them based in the Asia-Pacific region—have recently equipped aircraft to offer outbound (向外的)telephone calls to anywhere in the world using a new satellite system. And in the not-too-distant future, businessmen will be able to send faxes in flight, too. Air Canada, Qantas of Australia, United Airlines of the US and Japan Air Lines have at least one satellite-communication aircraft apiece. Hong Kong's Cathay Pacific Airways is also about to offer the service and several other airlines are expected to follow. The calls, dialed directly and charged to a credit card, will cost about US $ 9 ～ 10 per minute. The earlier flying phones Phone communications from aircraft are not entirely new. For some time, telephones have been available to passengers on US internal flights, for example, and on private jets. But these systems have used cellular phones operating on very high frequency radio links. These systems—the same links that keep pilots in touch with flight controllers—have either limited range or low quality and reliability, particularly over vast oceans such as the Pacific. By contrast, the new satellite service will provide clear links instantly to destinations around the world. Technological obstacles Several technological problems had to be resolved before the service could be introduced. One was to define an effective technical standard, Airinc 741, that guarantees compatibility among different manufacturers' avionics systems—essential if the service was to be truly global. Another was to make reliable antennas(天线) small enough and light enough to mount on aircraft of different types. And a third was to perfect voice-coding algorithms(规则系统), which tell machinery how to break down voice signals into digital signals for transmission at the standard rate of 9,600 bits a second. A further drawback, for any type of call routed by satellite, is an uncomfortable time lag between words being spoken and received. Because of the distance that signals have to travel, there is a delay of about a quarter of a second. With airborne calls, there is the potential for a double delay as signals arriving via satellite at a ground station are passed on via another satellite to their destination. To avoid this problem, ground stations have been equipped to identify calls from aircraft and route them to coaxial or fibre-optic cables for the second lag of their journey. Surface links, though long, are still considerably shorter than the 72,000-km round-trip into space. Most calls will therefore not suffer the double delay. The International Maritime Satellite Organization (Inmarsat) approved the initial sitcom system for commercial service last November 'after two years of trials. Besides the handful of aircraft operated by the five major carriers who have signed on to the system, about two dozen company jets have fitted with the necessary equipment. A new technology The technology has three components: antennas and associated equipment on board planes, communications satellites, and ground stations. In the course of development, antennas have lust both their dish shape and several kilograms. Even so, antenna and avionics weigh as much as two occupied scats. One obstacle to further weight savings, however, is that lighter antennas are more easily confused by the plethora(过多) of satellites now circling the Earth. The satellites themselves are provided by Inmarsat, a London-based cooperative of 64 nations. One operational satellite and several 'back-ups A．Y B．N C．NG

A．The kites whose wings can be taken apart. B．The kites whose wings can not be taken apart. C．The kites with large wings that can fly like birds. D．The kites that have large sizes and peculiar structures.

A、a good trip B、a pleasant journey home C、good lucky D、a happy journey travel

B．working C．trapping D．staying

A．can B．am C．are

设循环队列的结构如题33。若有一个Queue类型的队列Q，计算队列元素个数应该用(34)。 A．(Q.rear-Q.front+ MaxSize)%MaxSize； B．Q.rear-Q.front+1； C．Q.rear-Q.front-1； D．Q.rear-Qfront；

判断一个顺序存储的队列sp为空的条件是()。 A.sp->front=sp->rear B.sp->front=sp->rear+1 C.sp->front=sp->rear-1 D.sp->front=NULL

A.arise B.arose C.breed D.arouse

A．Can B．Will

A．simile B．personication C．metaphor D．sarcasm

此题为判断题(对，错)。

A．A.I&39;m feeling lonely.I wish I had someone to play wit B．B.Joyfully C．C.Listlessly D．D.Anxiously E．E.Delightedly