閱讀下面的短文。每篇短文的后面有五個問題，每個問題有四個備選答案。請根據(jù)短文的內(nèi)容選擇最佳答案。每個試題計3分,共計15分。

　　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.

　　hypersonicadj.超音速的　　 boostern.助推器

　　unmannedadj.無人的 booster rocket 助推火箭5skrAmdVet5kB:^Eup

　　噴氣發(fā)動機(jī)

　　練習(xí)：

　　A it was the first air-breathing jet plane.

　　C it flew at speeds smaller than five times the speed of sound.

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

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

　　D A iet engine that uses no oxygen.

　　A It goes slower than a rocket.

　　C It works only at speeds greater than five times the speed of sound.

　　4. What did Werner J.A.Dahm of the University of Michigan say about the Hyper-X test 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(jī)的氧氣噴氣式發(fā)動機(jī)是從空氣中汲取氧氣，火箭發(fā)動機(jī)必須自攜氧氣，而超音速沖壓噴氣發(fā)動機(jī)則不必白攜氧氣，而這正是Hyper-X使用的發(fā)動機(jī)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(jī)過程中的一個里程碑，而不是新型飛機(jī)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。

　　閱讀下面的短文。每篇短文的后面有五個問題，每個問題有四個備選答案。請根據(jù)短文的內(nèi)容選擇最佳答案。每個試題計3分,共計15分。

　　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.

　　hypersonicadj.超音速的　　 boostern.助推器

　　unmannedadj.無人的 booster rocket 助推火箭5skrAmdVet5kB:^Eup

　　噴氣發(fā)動機(jī)

　　練習(xí)：

　　A it was the first air-breathing jet plane.

　　C it flew at speeds smaller than five times the speed of sound.

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

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

　　D A iet engine that uses no oxygen.

　　A It goes slower than a rocket.

　　C It works only at speeds greater than five times the speed of sound.

　　4. What did Werner J.A.Dahm of the University of Michigan say about the Hyper-X test 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(jī)的氧氣噴氣式發(fā)動機(jī)是從空氣中汲取氧氣，火箭發(fā)動機(jī)必須自攜氧氣，而超音速沖壓噴氣發(fā)動機(jī)則不必白攜氧氣，而這正是Hyper-X使用的發(fā)動機(jī)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(jī)過程中的一個里程碑，而不是新型飛機(jī)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。