请输入或粘贴题目内容
搜题
拍照、语音搜题，请扫码下载APP
题目内容
（请给出正确答案）
A．A space rocket can only be used once.
B．The pilot can fly a space plane just like an ordinary plane.
C．A space rocket travels much faster than a space plane.
D．Both A and B.
答案
更多“A．A space rocket can only be used once.B．The pilot can fly a space plane just like an o”相关的问题
第1题
M: Well, it looks just like an ordinary plane, really. It’s about the same size as a plane, and it can carry about 50 passengers.
W: But it doesn’t act like an ordinary plane, does it？
M: No, it’s much faster. For example, you could fly from London to Beijing in only 30 minutes.
W: My goodness! And how does it work？
M: Well, shortly after taking off, the plane leaves the earth’s atmosphere and goes into orbit around the earth until it returns to the ground.
W: So it’s really a kind of space rocket.
M: Not really, no, for two reasons. First, a space rocket can only be used once, but this space plane can be used for many times. Second, while the plane is traveling through the atmosphere, the pilot can fly it just like an ordinary plane.
W: It sounds very exciting.
(20)
A．A satellite.
B．An ordinary plane.
C．A space plane.
D．A space rocket.
第2题
A．A space flight center.
B．A museum.
C．A monument.
D．A rocket research center.
第3题
Which of the following is not true of the Space Shuttle Columbia？
A．It was the first rocket ever made in history.
B．It did the first flight in 1981.
C．Its first flight was of great importance in the development of space exploration.
D．It can only stay in space for about a week now.
第4题
According to preliminary market surveys, there are 10,000 would-be space tourists willing to spend $1 million each to visit the final frontier. Space Adventures in Arlington have taken more than 130 deposits for a two-hour, $98,000 space tour tentatively set to occur by 2005. This may sound great, but there are a few hurdles: Putting a simple satellite into orbit--with no oxygen, lift: support or return trip necessary—already costs an astronomical $2,200/kg. And that doesn't include the cost of insuring rich and possibly litigious (爱打官司的) passengers. The entire group of entrepreneurs trying to comer the space- tourism market has between them "just enough money to blow up one rocket".
The U.S. space agency has plenty of money but zero interest in making space less expensive for the little guys. So the little guys are racing to do what the government has failed to do: design a reusable launch system that's inexpensive, safe and reliable. Kelly Space's prototype looks like a plane that has sprouted rocket engines. Rotary Rocket in California has a booster with rotors to make a helicopter-style. return to earth. The first passenger countdowns arc still years away, but bureaucrats at the Federal Aviation Administration in Washington arc already informally discussing flight regulations. After all, you can't be too prepared for a trip to that galaxy far, far away.
Which of the following is the best title for the passage？
A．Take Vacations in Space
B．Building Hotels in Space
C．Flight Regulations in Space Travels
D．Cost of Space Traveling
第5题
A．a closed surface
B．the gravity of the planet
C．the field of space
D．its critical point
第6题
Rocket Renaissance
The Ear of Private Spaceflight Is About to Start
Background
Two years ago, people witnessed the first space travel by SpaceShip One. Three people were involved in this flight: Burt Rutan, who designed the craft, and Mike Melvill, who flew it--although they were ably assisted by Paul Allen, one of the founders of Microsoft, who paid for it. Certainly, people have long been known that manned spaceflight was possible. What they showed was that it is not just a game for governments. Private individuals can play, too.
People involved
Now, lots of people want to join in, and most of them have just met up at the International Space Development Conference in Los Angeles, to engage in that mixture of camaraderie and competition that characterises the beginnings of a new technology. And, as might be expected, they have two of the necessary ingredients of success: ideas and money.
First, the money. So far, more than $1 billion is known to have been committed to building private spaceships and the infrastructure to support them. For example, Mr.. Rum' s follow-up vehicle, SpaceShip Two, is expected to cost its backers, Virgin Galactic, $240m for a fleet of five. The spaceport in New Mexico from which these are intended to fly will account for another $225m, although New Mexico's government is planning to raise this money itself.
These are not small sums, of course. On the other hand, Virgin Galactic has already banked $14m of deposits towards the $200,000 fare from people who want to travel on SpaceShip Two, even though it has yet to be built, let alone flown.
All this suggests that spaceflight, if not exactly entering the age of the common man, is at least entering the age of the moderately prosperous enthusiast. For entrepreneurs, it is no longer necessary to have billions of dollars to get into space; millions will now do. And for those who merely wish to travel there, and have enough money in their bank account, reality is favourable.
Get started
As with aircraft a century ago, a lot of designs are competing with each other, and there is no certainty about which will succeed. The initial goal is to build a "suborbital" vehicle. This will not have to develop the tremendous speed needed to go into orbit around the Earth. instead, it will travel briefly into space, offering a short thrilling ride out of the atmosphere, a few minutes of weightlessness, and a spectacular view of the planet from about 100kin. Four important criteria are how you take off, what fuel you use, what your craft is made of, and how you come back.
Most people's vision of a rocket launch is straight up from the ground. But, of the five vehicles most likely to be developed, two will actually be launched from the air. SpaceShip Two will be carded to high altitude by a purpose-built aircraft known as Eve before its rocket motor is ignited. And Explorer, a vehicle being designed by Space Adventures, will be launched from the top of a high-altitude Russian research plane called the M-55X, according to Eric Anderson, the firm's president and chief executive.
As Dennis Jenkins, a consultant engineer at NASA, America's space agency, points out, this is similar to using a two-stage rocket to get into space, with the aircraft acting as the first stage. However, a plane offers several advantages over a throw-away booster rocket. First, it can be used again. Second, it uses oxygen from the air, rather than having to carry its own oxidant, which saves weight. Third, it is lifted by wings. That means the atmosphere is an advantage, rather than a hindrance. All this means that the spacecraft itself can be lighter and cheaper.
Not everyone wants to run two vehicles, though. Jeff Greason, president of XCOR Aerospace, a firm based in Mojave, California, is developing a two-person, ground-launched suborbital rocketplane c
A．Y
B．N
C．NG
第7题
Impressive and complex 13 it may appear, the rocket, which was invented in China over 800 years 14 , is a relatively simple device.Fuel that is burned in the rocket engine changes 15 gas.The hot and rapidly expanding gas must escape, but it can do so only 16 an opening that faces backward.As the gas is 17 with great force, it pushes the rocket in the 18 direction.Like the kick of a gun when it is fired, it 19 the laws of nature described by Sir Isaac Newton when he discovered that“ 20 every action, there is an equal and opposite reaction.”
11.A.shown
B.been
C.appeared
D.proved
12.A.send
B.land
C.take
D.carry
13.A.that
B.so
C.as
D.sometimes
14.A.in advance
B.before
C.earlier
D.ago
15.A.as
B.into
C.for
D.the
16.A.in
B.at
C.by
D.through
17.A.transmitted
B.dispersed
C.erected
D.radiated
18.A.same
B.other
C.opposite
D.wrong
19.A.states
B.proves
C.follows
D.breaks
20.A.like
B.as
C.with
D.for
第8题
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.
第9题
Rocket Renaissance
The Ear of Private Spaceflight Is About to Start
Background
Two years ago, people witnessed the first space travel by SpaceShip One. Three people were involved in this flight: Burt Rutan, who designed the craft, and Mike Melvill, who flew it--although they were ably assisted by Paul Allen, one of the founders of Microsoft, who paid for it. Certainly, people have long been known that manned spaceflight was possible. What they showed was that it is not just a game for governments. Private individuals can play, too.
People involved
Now, lots of people want to join in, and most of them have just met up at the International Space Development Conference in Los Angeles, to engage in that mixture of camaraderie and competition that characterises the beginnings of a new technology. And, as might be expected, they have two of the necessary ingredients of success: ideas and money.
First, the money. So far, more than $1 billion is known to have been committed to building private spaceships and the infrastructure to support them. For example, Mr.. Rum&39; s follow-up vehicle, SpaceShip Two, is expected to cost its backers, Virgin Galactic, $240m for a fleet of five. The spaceport in New Mexico from which these are intended to fly will account for another $225m, although New Mexico&39;s government is planning to raise this money itself.
These are not small sums, of course. On the other hand, Virgin Galactic has already banked $14m of deposits towards the $200,000 fare from people who want to travel on SpaceShip Two, even though it has yet to be built, let alone flown.
All this suggests that spaceflight, if not exactly entering the age of the common man, is at least entering the age of the moderately prosperous enthusiast. For entrepreneurs, it is no longer necessary to have billions of dollars to get into space; millions will now do. And for those who merely wish to travel there, and have enough money in their bank account, reality is favourable.
Get started
As with aircraft a century ago, a lot of designs are competing with each other, and there is no certainty about which will succeed. The initial goal is to build a "suborbital" vehicle. This will not have to develop the tremendous speed needed to go into orbit around the Earth. instead, it will travel briefly into space, offering a short thrilling ride out of the atmosphere, a few minutes of weightlessness, and a spectacular view of the planet from about 100kin. Four important criteria are how you take off, what fuel you use, what your craft is made of, and how you come back.
Most people&39;s vision of a rocket launch is straight up from the ground. But, of the five vehicles most likely to be developed, two will actually be launched from the air. SpaceShip Two will be carded to high altitude by a purpose-built aircraft known as Eve before its rocket motor is ignited. And Explorer, a vehicle being designed by Space Adventures, will be launched from the top of a high-altitude Russian research plane called the M-55X, according to Eric Anderson, the firm&39;s president and chief executive.
As Dennis Jenkins, a consultant engineer at NASA, America&39;s space agency, points out, this is similar to using a two-stage rocket to get into space, with the aircraft acting as the first stage. However, a plane offers several advantages over a throw-away booster rocket. First, it can be used again. Second, it uses oxygen from the air, rather than having to carry its own oxidant, which saves weight. Third, it is lifted by wings. That means the atmosphere is an advantage, rather than a hindrance. All this means that the spacecraft itself can be lighter and cheaper.
Not everyone wants to run two vehicles, though. Jeff Greason, president of XCOR Aerospace, a firm based in Mojave, California, is developing a two-person, ground-launched suborbital rocketplane called Xerus. Launching from the ground, says Mr. Greason, is more difficult than air launching, but he reckons that in this case it has significantly lower operating costs.
Fuel choices
The second important design choice is the type of fuel. Unlike a jet engine, a rocket carries its own oxidant (氧第剂). This is why it can operate in space. Sometimes that oxidant is oxygen itself, in liquid form. In that case the fuel, too, is usually liquid-either kerosene (煤油) or liquid hydrogen (氢) —and the two liquids are stored in separate tanks until they meet in the rocket&39;s combustion chamber. Alternatively, both fuel and oxidant are solid, and are loaded pre-mixed, like the propellant of a firework rocket.
SpaceShip Two, though, follows the design of SpaceShip One and is powered by a mixture of the two. The combustion chamber of a mixture is partly filled with solid fuel but no oxidant. However, the fuel is coated round the inside of the chamber, leaving a hole through the middle into which a liquid or gaseous oxidant can be pumped, and out of which the exhaust emerges. In SpaceShip One, the fuel was rubber and the oxidant a liquefied gas called nitrous oxide (一氧化二氮).
Proponents of mixture say they are safer than either pure solid or pure liquid rockets. George Whittinghill, Virgin Galactic&39;s chief technologist, says that they are safer than solid rockets because the flow of oxidant can be controlled, and combustion halted, if there is a problem. Solid rockets, like the fireworks they resemble, cannot be stopped until they run out of fuel. On the other hand liquid-fuelled engines, though they can be shut down, are complex and temperamental. As Mr. Whittinghill observes, "they have pumps, seals, valves and lines everywhere, and there is a lot that potentially could go wrong."
All this rather irrates those working on liquid propulsion. Richard Pournelle, head of investor relations at XCOR Aerospace, says the comparison is unfair. Liquid propulsion is routine in rocketry while hybrids are still rare. Numbers alone, therefore, mean that liquid-fuelled rockets blow up more often. That, Mr. Pournelle argues, does not prove that they are inherently unsafe. Chuck Lauer, vice- president of business development for Rocketplane, another firm going down the liquid-fuelled route, agrees and argues that kerosene is widely used as aviation fuel and nobody complains that it is unsafe.
1. It is only two years ago that people became aware of the fact that manned spaceflight was actually possible.
A.Y
B.N
C.NG
Spaceflight is possible for individuals who want to fly in the space and who have the money.
A.Y
B.N
C.NG
The initial goal of building an aircraft is to make the vehicle fly, and speed was not such a primary consideration.
A.Y
B.N
C.NG
All of the five vehicles most likely to be developed will be launched from the air.
A.Y
B.N
C.NG
Although it is possible to launch the spaceship both from ground and from the air, some people believe it&39;s more cost-effective to launch it from ground.
A.Y
B.N
C.NG
A consultant engineer at NASA points out that using aircraft acting as the first Stage provides several advantages over a throw-away booster rocket.
A.Y
B.N
C.NG
In the design considerations of a spaceship, fuel choice is as important as the method of launching.
A.Y
B.N
C.NG
A rocket carries its own oxidant, and its fuel is usually either kerosene or______.
Proponents of mixture say that they are______than either pure solid or pure liquid rockets.
Proponents of kerosene cite the example of______using it as fuel
请帮忙给出每个问题的正确答案和分析，谢谢！
第10题
We know that there is air all around the world. We could not breathe without air. Airplanes could not fly without air. Thy need air to lift their wings. Airplanes cannot fly very high because as they go higher the air gets thinner. If we go far enough away from the earth, we find there is no air. What is the sky？ The sky is space. In this space there is nothing except the sun, the moon and all the stars. Scientists have always wanted to know more about the other worlds in the space. They have looked at them through telescopes and in this way they have found out a great deal. The moon is about 384,000 kilometers away from the earth. An airplane cannot fly to the moon but there is a thing that can fly even when there is no air. This is rocket.
I am sure that you are asking, “How does a rocket fly？” if you want to know, get a balloon and then blow it up until it is quite big. Do not tie up the neck of the balloon. Let go! The balloon will fly off through the air very quickly. The air inside the balloon tries to get out. It rushes out through the neck of the balloon and this pushes the balloon through the air. It does not need wings like an airplane. This is how a rocket works. It is not made of rubber like a balloon, of course. It is made of metal. The metal must not be heavy but it must be very strong. There is gas inside the rocket which is made very hot. When it rushes out of the end of the rocket, the rocket is pushed up into the air.
Rockets can fly fat out into space. Rockets with men inside them have already reached the moon. Several rockets, without men inside them, have been sent to other worlds much father away. One day rockets may be able to go anywhere in the space.
36. What color is the sky()？
A. It is blue .
B. It is white.
C. It is grey.
D. It has no color.
37. When an airplane flies too high()？
A. the air will be too thin to support its wings
B. the air will become thicker
C. the air will exert pressure on it
D. the air will disappear in no time
38. A rocket can fly to the moon because ().
A. it looks like a balloon
B. it is much lighter than an airplane
C. it doesn’t have wings
D. it works like an untied balloon
39. Which of the following statements about a rocket is NOT true()？
A. It can fly when there is no air.
B. It can fly without wings
C. It is made of strong metal
D. it is propelled by burning gas inside it.
40. A rocket is pushed up into the air when ().
A. hot gas rushes out of its head
B. it is powered by gas
C. hot gas rushes out of its bottom
D. hot gas rushes out of its neck.
