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A new kind of radar has been developed for spaceship travelers. A working laboratory model

of a new system of radar that makes use of a beam of light is said to be ten thousand times more accurate than the best comparable system of radar that used microwaves.

The model has shown that this radar system, known as laser-doppler radar, can measure with absolute precision speeds varying from spaceship orbital injection (进入) velocities (速度) of five miles per second down to virtual stops--speeds of less than one ten thousandth of an inch per second. According to the scientists who are developing this system, such fine measures of velocity are of prime importance in space missions. In a rendezvous (对接) between two spaceships, or in a landing approach by a vehicle onto an orbiting space station, a bump could rip open a ship's skin, or a nudge could knock the station out of its orbit.

The light-beam radar, which operates at a frequency of trillions (百万兆) of cycles per second, could easily detect and measure the movement of a vehicle edging up to a satellite space station. A control system using so precise a signal as this would allow a huge vehicle to dock at a space station as lightly as a feather.

Laser-doppler radar ______. ()

A．measures the movements of a spaceship by means of light beam

B．makes use of microwaves

C．makes use of sound waves

D．Both A and B

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更多“A new kind of radar has been d…”相关的问题

第1题

Laser-doppler radar is especially valuable in space missions because ______. （)A．it is on

Laser-doppler radar is especially valuable in space missions because ______. ()

A．it is one thousand times more precise than microwave radar

B．it provides precise measures of the velocity of space vehicles

C．it is a new system of radar

D．it can measure the movement of a spaceship less accurately than a microwave radar

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第2题

This passage is trying to tell us about______.A．motorists'troubles in parking their cars i

This passage is trying to tell us about______.

A．motorists'troubles in parking their cars in cities

B．the reason why a new kind of hotel is getting popular

C．which place is better for people to stay for the night

D．how to find a place to park your car when traveling

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第3题

Salesman: Good morning. Planning to buy a new car today？Customer: ______.Salesman: What ki

nd of car are you looking for？Customer: Something that has enough room for my family.A.I'm just looking around B.I'm just looking everywhereC.I'm just looking here and there D.I'm just looking all the cars

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第4题

Salesman: Good morning. Planning to buy a new car today？ Customer: ______. Salesman: What

kind of car are you looking for？ Customer: Something that has enough room for my family.

A．I'm just looking around

B．I'm just looking everywhere

C．I'm just looking here and there

D．I'm just looking all the cars

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第5题

In a new school, Liu Hui wonders how to build a good relationship with his new classma

tes and is asking for Li Hua's advice._

LI HUA：Hi, Liu Hui. Have you got something on your __1___

LIU HUI：Hmmm, I'm ... a little ... upset.

LI HUA：Anything wrong It's only the___2__ of the first semester . How are you getting on with your school life

LIU HUI：My classmates are from different places, with all those different backgrounds . I'm not___3__ how to get along with them.

LI HUA：That's not difficult. Try your___4__ to find common topics to talk with them about.

LIU HUI：What kind of common topics

LI HUA：Hobbies, games, hometown, family and so on.

LIU HUI：Well. I see. Breaking the ice is a good way to make ___5__. Thank you very much.

LI HUA：My pleasure.

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第6题

The first hotels were very different from today's hotels. They were small inns built along

the road. Later, as people began to travel by train, hotels were built in the centers of large cities. Usually located near railroad stations, these hotels were many stories tall and had hundreds of rooms.

Although trains were a popular means of travel for some time, automobiles slowly began to take their place. Automobile travel caused problems for city hotels, which did not have enough parking space for so many cars.

People who traveled by automobile needed a different kind of hotel. They needed places to stay that were near highways and had room to park. Motorists did not like to drive in heavy city traffic to reach a hotel. The answer to the motorists' problems came when a new kind of hotel was built. These new buildings were called motels, a word made from the first part of MOTORIST and the last part of HOTELS.

Motels were much smaller than hotels. Built on ground level, often in separate units, they were more convenient for people traveling. The separate units also made them quieter than hotels, best of all, there was more than enough room for cars to park. ,

Now, many big hotels in the cities are being torn down. They can no longer make enough money to stay in business. In their place, many small motels have been built on the outskirts(近郊) of cities. Motels have become a big business in the United States.

The first hotels were built______.

A．with hundreds of rooms

B．around the city centers

C．near railway stations

D．quite close to roads.

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第7题

In 1826, a Frenchman named Niepce needed pictures for his business.So he invented a very s

In 1826, a Frenchman named Niepce needed pictures for his business. So he invented a very simple camera. He put it in a window of his house and took a picture of his garden. That was the first photo.

The next important date in the history of photography (摄影术) was in 1837. That year, Daguere, another Frenchman, took a picture of his reading room. He used a new kind of camera in a different way. In his picture you could see everything very clearly, even the smallest thing. This kind of photo was called a Daguerreotype.

In about 1840, photography was developed. Then photographers could take pictures of people and moving things. That was not simple. The photographers had to carry a lot of film and other machines. But this did not stop them, for example, some in the United States worked so hard.

Mathew Brady was a famous American photographer. He took many pictures of great people. The pictures were unusual' because they were very lifelike.

Photographs also became one kind of art by the end of the 19th century. Some photos were not just copies of the real world. They showed feelings like other kinds of art.

The first photo taken by Niepce was a picture of______.

A．his business

B．his house

C．his garden

D．his window

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第8题

听力原文： Good evening, welcome to the first meeting of our spring cycling season. It's a

pleasure to see so many new faces here. I certainly hope that most of you will soon feel right at home with our group and bicycling will be a regular hobby for you and a part of your physical routine. Some of you may not realize that the State of New Jersey offers ample opportunities for bicyclists of all abilities. We've rolling countryside, miles of beaches, lovely hills and mountains and valleys and thousands of miles of roads. Beginners will find the shore suitable for their needs while expert riders will find that the steep trails of the region offer a challenge to their skill. In addition, New Jersey is rich in historical interest. The state abounds in colonial architecture, battlefields of the revolution and other historic sites important in the early history of the country, most are carefully preserved and restored. We organize tours to a variety of places nearly every weekend. Next Saturday's tour will relatively be a easy one. Interested cyclists will meet at 8 a. m. in the parking lot at the corner of Hamilton Street and College Avenue. The minimum time of this tour is about six hours. Each new rider must team up with an experienced rider. You can pick up a map of Saturday's tour at the information table before you leave this evening.

What is the purpose of the talk？

A．To encourage people to participate in a club activity.

B．To introduce a new kind of bicycle.

C．To inform. the beginning cyclists about New Jersey's traffic law.

D．To warn tourists about bicycling on the roadways.

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第9题

The Voice of America began during the World War II when Germany was broadcasting a radio p

rogram to get international (21) . American officials believed they should (22) the German broadcast with words that they thought were the facts of world (23) . The first VOA news report began with these words in (24) : "The (25) may be good or bad, but we shall tell you the truth." Within a week, other VOA (26) were broadcasting in Italian, French and English.

After the World war II (27) in 1945, some Americans felt VOA's (28) had to be changed, (29) the Soviet Union (苏联)became the enemy of America. They wanted to reach Soviet listeners. Then VOA began broadcasting in Russian.

In the early years VOA began (30) something new to its broadcast that was (31) "Music USA" , Another new idea came (32) in 1959. VOA knew that many listeners did not know (33) English to completely understand its normal English broadcast. So VOA (34) a simpler kind of English, which uses about 1,500 words and is spoken (35) ,of course, it is Special English.

21.

A. business

B. culture

C. support

D. information.

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第10题

Longbusridesareliketelevisionshows.Theyhaveabeginning，amiddle，andanend—withcommercialsthro

Long bus rides are like television shows. They have a beginning，a middle，and an end—with commercials thrown in every three or four minutes. The commercials are unavoidable. They happen whether you want them or not. Every couple of minutes a billboard glides by outside the bus window. “Buy Super Clean Toothpaste. ”“Drink Root Beer. ” “Fill up with Pacific Gas. ” Only if you sleep, which is equal to turning the television set off, are you spared the unending cry of “You Need It! Buy It Now !，’The beginning of the ride is comfortable and somewhat exciting, even if you've traveled that way before. Usually some things have changed—new houses, new buildings, sometimes even a new road. (76) The bus driver has a style of driving and it ’ s fun to try to figure it out the first hour or so. If the driver is particularly reckless or daring, the ride can be as thrilling as a suspense story. Will the driver pass the truck in time？ Will the driver move into the right or the left-hand lane？ After a while, of course, the excitement dies down. Sleeping for a while helps pass the middle hours of the ride. Food always makes bus rides more interesting. But you ’ ve got to be careful of what kind of food you eat. Too much salty food can make you very thirsty between stops.

The end of the ride is somewhat like the beginning. You know it will soon be over and there ’ s a kind of expectation and excitement in that. The seat, of course, has become harder as the hours have passed. (77) By now you ’ ve sat with your legs crossed，with your hands in your lap，with your hands on the armrests—even with your hands crossed behind your head. The end comes just at the right time. There are just no more ways to sit.

According to the passage, what do the passengers usually see when they are on a long bus trip？

A.Buses on the road.

B.Films on television.

C.Advertisements on the board.

D.Gas stations.

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