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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. 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. 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. What has NASA planned to do? B To make three more Hyper-X experiments. D To make the aircraft fly higher and longer. | 
