Flying the Hypert1 Skies　　A little airplane has given new meaning to the term going hyper.　　The Hyper-X is an unmanned，experimental aircraft just 12 feet long. It achieves hypersonic speed using a special sort of engine known as a scramjet3.It may sound like something from a comic book，but engineers have been experimenting with scramjets since the 1960s.　　Out of the three experimental Hyper-X aircrafts built for NASA5，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.　　1. The Hyper-X broke the record because　　B it flew along the equator.　　D it traveled at a supersonic speed.　　A A jet engine that gets oxygen from the air.　　C A rocket engine that carries its own supply of oxygen.　　3. What is NOT true about the scramjet engine?　　B It extracts oxygen from the air that flows through the engine.　　D It doesnt carry its own oxygen supply.　　A It indicated the birth of a very fast airplane.　　C It can transportcargo quickly and cheaply to the brink of space.　　5. What has NASA planned to do?　　B To make three more Hyper-X experiments.　　D To make the aircraft fly higher and longer.　　1. C Hyper-X之所以打破纪录是因为它的飞行速度是音速的7倍。它不是第一架空气喷气式飞机，也不是第一架超音速飞机，所以A和D都不对。Hyper-X的试飞并未绕赤道飞行，所以B也是错误的选择。　　3. A 根据第五段内容，B、C、D都是正确的说法。第四段最后一句告诉我们，A的说法是不正确的。　　5. A 答案可在最后一段找到。

　　Flying the Hypert1 Skies　　A little airplane has given new meaning to the term going hyper.　　The Hyper-X is an unmanned，experimental aircraft just 12 feet long. It achieves hypersonic speed using a special sort of engine known as a scramjet3.It may sound like something from a comic book，but engineers have been experimenting with scramjets since the 1960s.　　Out of the three experimental Hyper-X aircrafts built for NASA5，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.　　1. The Hyper-X broke the record because　　B it flew along the equator.　　D it traveled at a supersonic speed.　　A A jet engine that gets oxygen from the air.　　C A rocket engine that carries its own supply of oxygen.　　3. What is NOT true about the scramjet engine?　　B It extracts oxygen from the air that flows through the engine.　　D It doesnt carry its own oxygen supply.　　A It indicated the birth of a very fast airplane.　　C It can transportcargo quickly and cheaply to the brink of space.　　5. What has NASA planned to do?　　B To make three more Hyper-X experiments.　　D To make the aircraft fly higher and longer.　　1. C Hyper-X之所以打破纪录是因为它的飞行速度是音速的7倍。它不是第一架空气喷气式飞机，也不是第一架超音速飞机，所以A和D都不对。Hyper-X的试飞并未绕赤道飞行，所以B也是错误的选择。　　3. A 根据第五段内容，B、C、D都是正确的说法。第四段最后一句告诉我们，A的说法是不正确的。　　5. A 答案可在最后一段找到。