题目内容
（请给出正确答案）
This rocket has sufficient power to blow a battleship to pieces.
A) constructive
B) destructive
C) delicate
D) economical
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更多“This rocket has sufficient pow…”相关的问题
A．It failed because of a sudden rocket explosion.
B．It has been re-scheduled for a midday takeoff.
C．It has been canceled due to technical problems.
D．It was delayed for eleven hours and thirty minutes.
According to the news, what has happened last autumn？
A．A rocket has been successfully launched.
B．There was a rocket hitting the moon.
C．A deep crater appeared on the moon"s South Pole.
D．There was an amazing finding made by LRO.
A.It failed because of a sudden rocket explosion.
B.It has been re, scheduled for a midday takeoff.
C.It has been canceled due to technical problems.
D.It was delayed for eleven hours and thirty minutes.
Escaping from the Earth
The Earth has a force that pulls things toward itself. We call this force gravity(地心引力). This is something we live with all the time, and we take it for granted and hardly ever think about it. But it is a most important factor in rocket operation and must be overcome if we are to get anywhere in space, or off the ground at all.
Take the throwing of a ball as an example. The harder the ball is thrown, the faster and higher it will go. What is the secret？ Its speed. If we could throw the ball hard enough it would go up and up forever and never come down. The speed at which it would have to be thrown to do this is known as escape speed. Of course, we cannot throw a ball hard enough because the speed required to escape completely from the Earth's gravity is seven miles per second, or over twenty-five thousand miles per hour.
Once escape speed has been reached by a spacecraft(宇宙飞船), no further power is needed. A rocket aimed at the Moon, for instance, will "coast"(滑行) the rest of the way because the Earth's gravity cannot then pull it back, and there is no air resistance(阻力) in space to slow it down. This "coasting" is known as "free fall". That does not mean the rocket is falling down towards the Earth but that it is traveling freely in space without the aid of power, like a bicycle coasting downhill.
Free fall is an important feature of space travel: it would be impossible to carry enough fuel to provide powered flight all the time.
What is the most important factor for a rocket to escape from the Earth？
A．To travel as fast as it can.
B．To overcome the Earth gravity.
C．To get away from the air resistance.
D．To have strong power in its operation.
Judging from the discoveries and outcomes, the scientists claimed that
A．a large quantity of frozen water existed on the moon.
B．the water on the moon was as much as in the desert.
C．there was a lot of rocket remaining on the moon surface.
D．a large area has been affected by the rocket.
Which of the following statements is INCORRECT according to the news item？
A．Curiosity will be the seventh NASA spacecraft to land on the Mars if successful.
B．Curiosity will trave at about 20,000 kilometers per hour when it hits the Martian surface.
C．Curiosity is the size of a small car and has 17 cameras.
D．Curiosity will be lowered to the Martian surface on cables and cut loose before the rocket pack blasts off.
Which of the following is TRUE？
A．The spaceship travels to its destination with its own fuel.
B．The booster separates and drops when all the fuel it carries has used up.
C．The multi-stage rocket is powerful enough to send the spaceship to its destination.
D．The spaceship gets out of the Earth's gravitation force and flies to its destination on its own.
Escaping from the Earth
The Earth has a force that pulls things toward itself. We call this force gravity(地心引力). This is something we live with all the time, and we take it for granted and hardly ever think about it. But it is a most important factor in rocket operation and must be overcome if we are to get anywhere in space, or off the ground at all.
Take the throwing of a hall as an example. The harder the ball is thrown, the faster and higher it will go. What is the secret？ Its speed. If we could throw the ball hard enough it would go up and up forever and never come down. The speed at which it would have to be thrown to do this is known as escape speed. Of course, we cannot throw a ball hard enough because the speed required to escape completely from the Earth's gravity is seven miles per second, or over twenty-five thousand miles per hour.
Once escape speed has been reached by a spacecraft(宇宙飞船), no further power is needed. A rocket aimed at the Moon, for instance, will "coast"(滑行) the rest of the way be cause the Earth's gravity cannot then pull it back, and there is no air resistance(阻力) in space to slow it down. This "coasting" is known as "free fall". That does not mean the rocket is falling down towards the Earth but that it is traveling freely in space without the aid of power, like a bicycle coasting downhill.
Free fall is an important feature of space travel: it would be impossible to carry enough fuel to provide powered flight all the time.
What is the most important factor for a rocket to escape from the Earth？
A．To travel as fast as it can.
B．To overcome the Earth gravity.
C．To get away from the air resistance.
D．To have strong power in its operation.
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, life 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 are still years away, but bureaucrats at the Federal Aviation Administration in Washington are 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
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.
