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.

　 C Hyper-X之所以打破紀錄是因為它的飛行速度是音速的7倍。它不是第一架空氣噴氣式飛機，也不是第一架超音速飛機，所以A和D都不對。Hyper-X的試飛并未繞赤道飛行，所以B也是錯誤的選擇。

　　A 根據第五段內容，B、C、D都是正確的說法。第四段最后一句告訴我們，A的說法是不正確的。

　　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.

　　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.

　 C Hyper-X之所以打破紀錄是因為它的飛行速度是音速的7倍。它不是第一架空氣噴氣式飛機，也不是第一架超音速飛機，所以A和D都不對。Hyper-X的試飛并未繞赤道飛行，所以B也是錯誤的選擇。

　　A 根據第五段內容，B、C、D都是正確的說法。第四段最后一句告訴我們，A的說法是不正確的。

　　A 答案可在最后一段找到。