Flying the Hypert1 Skies

　　The Hyper-X2 recently broke the record for air-breathing jet planes when it traveled at a hypersonic speed of seven times the speed of sound.Thats about 5,000 miles per hour.At this speed，youd get around the world flying along the equator in less than 5 hours.

　　For an engine to burn fuel and produce energy，it needs oxygen.A jet engine，like those on passenger airplanes，gets oxygen from the air.A rocket engine typically goes faster but has to carry its own supply of oxygen.A scramjet engine goes as fast as a rocket，but it doesnt have to carry its own oxygen supply.A scramjets special design allows it to obtain oxygen from the air that flows through the engine.And it does so without letting the fast-moving air put out the combustion flames. However，a scramjet engine works properly only at speeds greater than five times the speed of sound.A booster rocket carried the Hyper-X to an altitude of about 100,000 feet for its test flight.The aircrafts record-beating flight lasted just 11 seconds.Although the little planes self-powered flight lasted only 11 seconds，that brief journey on March 27 makes a major milestone on the way to a new breed of very fast airplanes，comments Werner J.A.Dahm of the University of Michigan in Ann Arbor4.In the future，engineers predict，airplanes equipped with scramjet engines could transport cargo quickly and cheaply to the brink of space. Such hypersonic jets could potentially carry passengers anywhere in the world in just a few hours.

　　詞匯:7haipE5sCnik 5bu:stEp

　　equator n.赤道 milestonen.里程碑

　　scramjetn.超音速燃燒沖壓式， cargon.貨物

　　combustionn.燃燒 brinkn.邊緣

　　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.

　　flight?

　　B It was self-powered，so it lasted only 11 seconds.

　　D It is a major milestone in the journey of making a new type of very fast airplanes,

　　A To make another 11-second hypersonic flight at 10 times the speed of the sound.

　　C To retest the aircraft that is left.

　　答案與題解：

　　2. B 第四段講了三種發(fā)動機的氧氣噴氣式發(fā)動機是從空氣中汲取氧氣，火箭發(fā)動機必須自攜氧氣，而超音速沖壓噴氣發(fā)動機則不必白攜氧氣，而這正是Hyper-X使用的發(fā)動機裝置。

　　4. D 文章的第六段中，密歇根大學(xué)的研究人員Werner J.A.Dahm說，Hyper-X的試飛成功只是研制一種新式快速飛機過程中的一個里程碑，而不是新型飛機的誕生。所以，D是正確選擇，A是錯誤選擇。B也不是Werner J.A.Dahm想要表達(dá)的意思。C是其他下程師而不是Werner J.A.Dahm說的話。

　　Flying the Hypert1 Skies

　　The Hyper-X2 recently broke the record for air-breathing jet planes when it traveled at a hypersonic speed of seven times the speed of sound.Thats about 5,000 miles per hour.At this speed，youd get around the world flying along the equator in less than 5 hours.

　　For an engine to burn fuel and produce energy，it needs oxygen.A jet engine，like those on passenger airplanes，gets oxygen from the air.A rocket engine typically goes faster but has to carry its own supply of oxygen.A scramjet engine goes as fast as a rocket，but it doesnt have to carry its own oxygen supply.A scramjets special design allows it to obtain oxygen from the air that flows through the engine.And it does so without letting the fast-moving air put out the combustion flames. However，a scramjet engine works properly only at speeds greater than five times the speed of sound.A booster rocket carried the Hyper-X to an altitude of about 100,000 feet for its test flight.The aircrafts record-beating flight lasted just 11 seconds.Although the little planes self-powered flight lasted only 11 seconds，that brief journey on March 27 makes a major milestone on the way to a new breed of very fast airplanes，comments Werner J.A.Dahm of the University of Michigan in Ann Arbor4.In the future，engineers predict，airplanes equipped with scramjet engines could transport cargo quickly and cheaply to the brink of space. Such hypersonic jets could potentially carry passengers anywhere in the world in just a few hours.

　　詞匯:7haipE5sCnik 5bu:stEp

　　equator n.赤道 milestonen.里程碑

　　scramjetn.超音速燃燒沖壓式， cargon.貨物

　　combustionn.燃燒 brinkn.邊緣

　　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.

　　flight?

　　B It was self-powered，so it lasted only 11 seconds.

　　D It is a major milestone in the journey of making a new type of very fast airplanes,

　　A To make another 11-second hypersonic flight at 10 times the speed of the sound.

　　C To retest the aircraft that is left.

　　答案與題解：

　　2. B 第四段講了三種發(fā)動機的氧氣噴氣式發(fā)動機是從空氣中汲取氧氣，火箭發(fā)動機必須自攜氧氣，而超音速沖壓噴氣發(fā)動機則不必白攜氧氣，而這正是Hyper-X使用的發(fā)動機裝置。

　　4. D 文章的第六段中，密歇根大學(xué)的研究人員Werner J.A.Dahm說，Hyper-X的試飛成功只是研制一種新式快速飛機過程中的一個里程碑，而不是新型飛機的誕生。所以，D是正確選擇，A是錯誤選擇。B也不是Werner J.A.Dahm想要表達(dá)的意思。C是其他下程師而不是Werner J.A.Dahm說的話。