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之所以打破纪录是因为它的飞行速度是音速的7倍。它不是第一架空气喷气式飞机,也不是第一架超音速飞机,所以A和D都不对。Hyper-X的试飞并未绕赤道飞行,所以B也是错误的选择。
A 根据第五段内容,B、C、D都是正确的说法。第四段最后一句告诉我们,A的说法是不正确的。
A 答案可在最后一段找到。
牛津实用英语语法 a/an(不定冠词)
比较and和or
句子的种类
as, which 非限定性定语从句
主动形式表示被动意义
比较so和 such
引导名词性从句的连接词
不用进行时的动词
被动形式表示主动意义
what/whatever;that/what; who/whoever
谓语需用单数
并列连词与并列结构
need "不必做"和"本不该做"
名词性wh
表示"一…就…"的结构
wish的用法
关系副词引导的定语从句
名词性that
would rather表示"宁愿"
指代意义决定谓语的单复数
so, neither, nor作部分倒装
关系代词引导的定语从句
用一般过去时代替完成时
结果状语从句
比较while, when, as
否定转移
原因状语从句
反意疑问句
will和would
并列结构作主语时谓语用复数
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |