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.
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