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.

　　词汇

　　hypersonic/7haipE5sCnik/adj.超音速的　　 booster/ 5bu:stE/n.助推器

　　equator/i5kweitE/ n.赤道　　　　　　　　　milestone/5mailstEun/n.里程碑

　　unmanned/Qn5mAnd/adj.无人的 booster rocket 助推火箭

　　scramjet/5skrAmdVet/n.超音速燃烧冲压式， cargo/5kB:^Eu/n.货物

　　喷气发动机

　　combustion/kEm5bQstFEn/n.燃烧 brink/briNk/n.边缘

　　练习：

　　1. 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.

　　2. What kind of an engine did the Hyper-X use?

　　A A jet engine that gets oxygen from the air.

　　B A scramjet engine that doesnt carry its own oxygen supply.

　　C A rocket engine that carries its own supply of oxygen.

　　D A iet engine that uses no oxygen.

　　3. What is NOT true about the scramjet engine?

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