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[主观题]

The rocket engine, with its steady roar like that of a waterfall or a thunderstorm, is an

impressive symbol of the new space age. Rocket engines have【C1】______powerful enough to shoot astronauts【C2】______the earth's gravitational pull and【C3】______them on the moon. We have now become【C4】______in space. Impressive and complex【C5】______it may appear, the rocket, which was【C6】______in China over 800 years【C7】______, is a relatively simple device. Fuel that is【C8】______in the rocket engine changes【C9】______gas. The hot and rapidly【C10】______gas must escape, but it can do so only【C11】______an opening that【C12】______backward. As the gas is【C13】______with great force, it【C14】______the rocket in the【C15】______direction. Like the kick of a gun【C16】______it is fired, it【C17】______the laws of nature【C18】______by Sir Isaac Newton when he discovered that"【C19】______every action, there is【C20】______equal and opposite reaction."

【C1】

A．shown

B．been

C．appeared

D．proved

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发布时间：2020-11-09

更多“The rocket engine, with its steady roar like that of a waterfall or a thunderstorm, is an”相关的问题

第1题

What kind of engine did the Hyper-X use？A．A jet engine that carries its own oxygen supply.

What kind of engine did the Hyper-X use？

A．A jet engine that carries its own oxygen supply.

B．A jet engine that uses no oxygen.

C．A scramjet engine that doesn't carry its own oxygen supply.

D．A rocket engine that carries its own oxygen supply.

点击查看答案

第2题

What kind of engine did the Hyper-X use？查看材料A.A je

What kind of engine did the Hyper-X use？查看材料

A.A jet engine that carries its own oxygen supply.

B.A jet engine that uses no oxygen.

C.A scramjet engine that doesn"t carry its own oxygen supply.

D.A rocket engine that carries its own oxygen supply.

点击查看答案

第3题

32 What kind of engine did the Hyper-X use？A A jet engine that carries its own oxygen supp

32 What kind of engine did the Hyper-X use？

A A jet engine that carries its own oxygen supply．

B A jet engine that uses no oxygen．

C A scramjet engine that doesn't carry its own oxygen supply．

D A rocket engine that carries its own oxygen supply.

点击查看答案

第4题

What kind of an engine did the Hyper-X use？A．A jet engine that gets oxygen from the air.B．

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

A．A jet engine that gets oxygen from the air.

B．A scramjet engine that doesn't carry its own oxygen supply.

C．A rocket engine that carries its own supply of oxygen.

D．A jet engine that uses no oxygen.

点击查看答案

第5题

听力原文：Since the beginning of history, people on the earth have always watched the sky a

听力原文： Since the beginning of history, people on the earth have always watched the sky and wondered about the things they saw. As centuries of discoveries flew by, it became obvious that humans would not be content to just gaze at the solar system. We wanted to fly into it and explore it as well.

Once again, technology allowed us to accomplish our goal. (33)On October 4, 1957. a Soviet rocket sent the first man-made satellite into space. It was called Sputnik, the Russian word for "traveler". Even though Sputnik was nothing more than a small aluminum ball with a radio inside, it started a whole new era of space exploration.

In May 1961 President John F. Kennedy challenged American scientists to land a person on the moon before the end of the 1960s. (34)In the quest to do this, scientists faced many obstacles. For example, to get a spaceship all the way to the moon and back would demand a rocket engine powerful enough to make the trip. (35)Scientists realized that it would be difficult for one heavy rocket loaded with fuel to reach the moon. Instead, they decided to use a multistage rocket. When the fuel in one stage of the multistage rocket is used up, that stage will fall away. This makes the rocket lighter, and the engine of the next stage can go on providing power and thrust the rocket even faster and higher. As you know, Americans successfully landed on the moon in July 1969. Since then our knowledge of the solar system has increased dramatically.

(34)

A．The Russian name for the spacecraft means "traveler".

B．It was launched toward the end of the 1950s.

C．It was resulted from Soviet and American scientists.

D．The spacecraft was a small aluminum ball fitted with a radio.

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第6题

听力原文：Robert Goddard, American physicist and rocket scientist, once said that the dream

听力原文： Robert Goddard, American physicist and rocket scientist, once said that the dream of yesterday is the hope of today and the reality of tomorrow. It was his scientific work that gave hope to many of our dreams about space and then turned them into reality.

Robert Goddard's many studies and tests in the early 1900s led to the first rocket. Then he developed rockets with more than one engine. Each engine pushed the rocket higher and higher out of Earth's atmosphere. His ideas are still used today.So, in a way, every rocket that flies today is a Goddard rocket.

Robert Goddard was far ahead of his time. He developed and flew many rockets that got their power from solid fuels. Then, in 1925, he made and tested the first rocket engine using a soft chemical fuel. In 1926, he successfully fired the world's first liquid-fuel rocket.

Robert Goddard died in 1945 of cancer. He was sixty-three years old. He received a special honor many years after his death. In 1959, the United States established the Goddard Space Flight Center near Washington, D.C. The Goddard Space Flight Center honors the man whose work proved that machines could travel out of Earth's atmosphere, into space.

(23)

A．An airplane designer.

B．A science fiction writer.

C．The inventor of rockets.

D．A famous theoretical physicist.

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第7题

The Hyper-XThe Hyper-X （超音速飞机) recently broke the record for air-breathing jet planes

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.

点击查看答案

第8题

Flying the Hyper1 Skies A little airplane has given new meaning to the term “going hyp

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．

点击查看答案

第9题

请根据短文的内容，回答题。 The Hyper-XThe Hyper-X （超音速飞机) recently broke the record for

请根据短文的内容，回答题。

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&39;s about 5,000 miles per hour. At this speed, you&39;d get around the world-flying along the equator (赤道 ) in less than 5 hours.＜br＞

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) .＜br＞

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&39;t have to carry its own oxygen supply.＜br＞

A scramjet&39;s special design allows it to obtain oxygen from the air that flows through the engine.＜br＞

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.＜br＞

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&39;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.＜br＞

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.＜br＞

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 __________. 查看材料

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

点击查看答案

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