It reached a speed of over 301 miles per hour. That's how ____ it went.

A speed of 30 miles per hour is equivalent to a speed of 44 feet per second. A speed of 33 feet per second is equivalent to a speed of x miles per hour.

Column A Column B

X 22.5

A．if the quantity in Column A is greater

B．if the quantity in Column B is greater

C．if the two quantity are equal

D．if the relationship cannot be determined from the information given

Flying the Hypert Skies

A little airplane has given new meaning to the term "going hyper. "

The Hyper-X recently broke the record for air-breathing jet planes when it traveled at a hypersonic speed of seven times the speed of sound. That's about 5,000 miles per hour. At this speed, you'd get around the world -- flying along the equator (赤道) -- in less than 5 hours.

The Hyper-X is an unmanned,experimental aircraft just 12 feet long. It achieves hypersonic (超音速的) speed using a special sort of engine known as a scramjet. It may sound like something from a comic book,but engineers have been experimenting with scramjets since the 1960s.

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 (紧急刹车) engine goes as fast as a rocket, but it doesn't have to carry its own oxygen supply. A scramjet's 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 (燃烧) 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 aircraft's record-beating flight lasted just 11 seconds. Although the little plane's 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 Arbor. 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.

Out of the three experimental Hyper-X aircrafts built for NASA, 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

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.

听力原文： A little airplane has given new meaning to the term "going hyper".

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

The Hyper-X is an unmanned, experimental aircraft just 12 feet long. It achieves hypersonic speed using a special sort of engine. Actually, engineers have been experimenting with such an engine since the 1960s.

For an engine to bum 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. This special engine goes as fast as a rocket, but it doesn't have to carry its own oxygen supply.

Its design allows it to extract oxygen from the air that flows through the engine. And it does so without letting the fast-moving air put out the combustion flames.

A booster rocket carried the Hyper-X to an altitude of about 100,000 feet for its test flight. The aircraft's record-beating flight lasted just 11 seconds.

In the future, engineers predict, airplanes equipped with such engines could transport cargo quickly and cheaply to the edge of space. Hypersonic airliners could carry passengers anywhere in the world in just a few hours.

(36)

A．How to develop a new airplane technology.

B．Features and possible usages of a special engine.

C．How to do experiment with dangerous engines.

D．How to do experiment with unmanned airplanes.

The Hyper-X

The Hyper-X (超音速飞机) recently broke the record for air-breathing jet planes when it traveled at a Hypersonic speed (超音速) of seven times the speed of sound. That's about 5,000 miles per hour: At this speed, you'd get around the world -flying along the equator (赤道) - in less than 5 hours.

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 scramjet (超音速冲压式喷气发动机).

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 doesn't have to carry its own oxygen supply.

A scramjet's 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 (燃烧) flames. However, a scramjet engine works properly only at speeds greater than five times the speed of sound.

A booster rocket (助推火箭) carried the Hyper-X to an altitude of about 100,000 feet for its test flight. The aircraft's record-beating flight lasted just 11 seconds. That brief journey on March 27 makes a major milestone on the way to a new breed of very fast airplanes, says Werner J. A. Dahm of the University of Michigan in Ann Arbor. In the future, engineers predict, airplanes equipped with scramjet engines could transport cargo quickly and cheaply to the brink (边缘) of space. Such hypersonic jets could carry passengers anywhere in the world in just a few hours.

Out of the three experimental Hyper-X aircrafts built for NASA, only one is now left. The agency has plans for another 11-second hypersonic flight, this time at 10 times the speed of sound.

The Hyper-X broke the record because

A．it was the first air-breathing jet plane.

B．it flew along the equator.

C．it traveled at the speed of sound.

D．it reached a speed of about 5,000 miles per hour.

下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。

第一篇

The Hyper-X

The Hyper-X（超音速飞机）recently broke the record for air-breathing jet planes when it traveled at a Hypersonic speed（超音速）of seven times the speed of sound．That's about 5,000 miles per hour．At this speed，you'd get around the world-flying along the equator （赤道）-in less than 5 hours．

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 scramjet（超音速冲压式喷气发动机）．

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 doesn't have to carry its own oxygen supply．

A scramjet's 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（燃烧） flames．However，a scramjet engine works properly only at speeds greater than five times the speed of sound．

A booster rocket（助推火箭）carried the Hyper-X to an altitude of about l00，000 feet for its test flight．The aircraft's record-beating flight lasted just 11 seconds；That brief journey on March 27 makes a major milestone on the way to a new breed of very fast airplanes, says Werner J．A．Dahm of the University of Michigan in Ann Arbor．In the future，engineers Predict，airplanes equipped with scramjet engines could transport cargo quickly and cheaply to the brink（边缘）of space．Such hypersonic jets could carry passengers anywhere in the world in just a few hours．

Out of the three experimental Hyper．X aircrafts built for NASA, only one is now left．The agency has plans for another 11-second hypersonic flight, this time at 10 times the speed of sound．

31 The Hyper-X broke the record because

A it was the first air-breathing jet plane．

B it flew along the equator．

C it traveled at the speed of sound．

D it reached a speed of about 5, 000 miles per hour，

The Hyper-X

The Hyper-X (超音速飞机) recently broke the record for air-breathing jet planes when it traveled at a Hypersonic speed (超音速) of seven times the speed of sound. That's about 5,000 miles per hour: At this speed, you'd get around the world -flying along the equator (赤道) - in less than 5 hours.

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 scramjet (超音速冲压式喷气发动机).

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 doesn't have to carry its own oxygen supply.

A scramjet's 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 (燃烧) flames. However, a scramjet engine works properly only at speeds greater than five times the speed of sound.

A booster rocket (助推火箭) carried the Hyper-X to an altitude of about 100,000 feet for its test flight. The aircraft's record-beating flight lasted just 11 seconds. That brief journey on March 27 makes a major milestone on the way to a new breed of very fast airplanes, says Werner J. A. Dahm of the University of Michigan in Ann Arbor. In the future, engineers predict, airplanes equipped with scramjet engines could transport cargo quickly and cheaply to the brink (边缘) of space. Such hypersonic jets could carry passengers anywhere in the world in just a few hours.

Out of the three experimental Hyper-X aircrafts built for NASA, only one is now left. The agency has plans for another 11-second hypersonic flight, this time at 10 times the speed of sound.

The Hyper-X broke the record because

A．it was the first air-breathing jet plane.

B．it flew along the equator.

C．it traveled at the speed of sound.

D．it reached a speed of about 5,000 miles per hour.

More than 30，000 drivers and front seat passengers are killed or seriously injuredeach year. At the speed of only 30 miles per hour. it is the same as falling farom athird-floor window. Wearing a seat belt saves Lives, it reduces your chance of death orserious injury by more than half. Therefore,drivers or front seat passengers over 14 in most vehicles must wear a seatbelt. If you do not, you could be fined up to $50. It will not be up to the drivers tomake sure you wear your belt. But it will be the driver s resp’nsibility to make surethat children under 14 do not ride in the front unless they are wearing a seat belt ofsome kind. However,you do not have to wear a seat belt if you are reversing your vehicle;or you are making a local delivery or collection using a special vehicle, or if you have a valid medical certificate which excuses you from wearing it. Make sure thesecircumstances apply to you before you decide not to wear your seat belt. Rememberyou may be taken to court for not doing so, and you may be fined if you cannotprove to the court that you have been excused from wearing it.

This text is taken from( ).

A．a medical magazine

B．a police report

C．a legal document

D．a government information booklet

Flying the Hyper1 Skies

A little airplane has given new meaning to the term “going hyper．”

The Hype-X recently broke the record for air-breathing jet planes when it traveled at a hypersonic speed of seven times the speed of sound． That’s about 5，000 miles per hour． At this speed， you’d get around the world-flying along the equator-in less than 5 hours．

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 scramjet． It may sound like something from a comic book，but engineers have been experimenting with scramjets since the 1960s．

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 doesn’t have to carry its own oxygen supply．

A scramjet’s special design allows it to obtain 0xygen 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 aircraft’s record—beating flight lasted just 11 seconds．Although the little plane’s 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 Arbor．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．

Out of the three experimental Hyper—X aircrafts built for NASA．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．

第 11 题 The Hyper X broke the record because

A．It was the first air—breathing jet plane．

B．1t flew along the equator．

C．It new at speeds six times larger than the speed of sound．

D．It was the first supersonic plane．