题目内容
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Scientists imagine such a change in weather on human population would be ______.
A．terrified
B．surprised
C．horrible
D．frightened
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更多“Scientists imagine such a chan…”相关的问题
Recent research suggests that the warming trend (倾向) of the past hundred years or so may be coming to an end. During the past ten years, scientists tell us that the temperature of the world has dropped a little. This would have effects on wind and rain in the weather picture.
Scientists believe clouds may be an important factor (因素) in changing the amount of heat on the earth. Another possibility is that man's agriculture and industry ways may affect the natural weather.
The weather of the world seems to be getting ______.
A．hotter
B．colder
C．warmer
D．freezing
NASA, the U.S. space agency, believes there's a good chance that we're not alone in the universe. Last fall, NASA began a new project called the High Resolution Microwave Survey (HRMS). Its aim: to find evidence of life in one of the billions of galaxies in the universe.
The search for intelligent life on other planets isn't new. It began almost 100 years ago. That's when scientists built a huge transmitter to send radio waves into space. Scientists thought smart beings on other planets might pick up the signals.
Scientists also have sent a message about humans and our solar system to a nearby constellation (星座 ). But because the constellation is 25,000 light years away, a return message wouldn't reach Earth for 50,000 years! So don't wait up for an answer.
So far, no extraterrestrial (地球外的 ) beings that we know of have returned our “ calls. ” But according to Dr. Jill Tarter, an HRMS scientist, we haven't exactly had our ears wide open. “ Now, however, ” says Dr. Tarter, “ we've built the tools we need to listen well.”
Last October, Dr. Tarter switched on the largest radio receiver in the world. It's an enormous metal bowl stretching 1,000 feet across a valley in Puerto Rico.
Meanwhile, another NASA scientist turned on a huge radio receiver in California's Mojave Desert. NASA hopes these big dishes-and others around the world-will pick up radio signals from new world.
Dr. Frank Drake has been searching for life in outer space for years. He explains the HRMS project this way: To listen to your radio, you move the tuner on the dial until the channels come in loud and clear: Now imagine radio receivers that scan our galaxy “listening” to 14 million channels every second. That's what NASA's radio receivers in Puerto Rico and California are doing.
But that's not all. Powerful computers hooked to the receivers examine every signal carefully. The computers try to match the signals to ones that scientists already recognize, such as human-made signals. If they can't, Drake and Tarter check on them. “It could prove there is radio technology elsewhere in the universe, ” says Dr. Tarter. “ And that would mean we're not alone. ” 26、NASA scientists started a new project in order to _______.
A、discover life in other galaxies
B、send human beings into space
C、find evidence of a new galaxy
D、confirm the number of galaxies
27、According to Dr.Jill Tarter ,the reason why we haven't received any return any return messages from outer space is that_______.
A、our ears are not sharp enough to hear them
B、our equipment hasn't been good enough
C、it takes millions of yuars for them to reach us
D、it takes quite a long time to send them
28、Dr.Jill Tarter compares the large receiver to _______.
A、the human ear
B、the universe
C、a metal bowl
D、a huge dish
29、According to Dr.Frank Drake ,NASA's radio receivers in Puerto Rico and California are _______.
A、trying to check on every channel carefully
B、moving the tuner on the dial for clear channels
C、scanning the universe for possible signals
D、picking up radio signals from new world
30、The best title of this passage is ________.
A、Signals from the Space
B、The Invention of New Radio Receivers
C、The Intelligent Life in Outer Space
D、NASA Listens for Space Neighbors
At first this did not seem like a particularly hard task. Scientists began to try making synthetic diamonds towards the end of the eighteenth century. It was at this time that a key scientific fact was discovered: diamonds are a form. of carbon, which is a very common element. Graphite, the black mineral that is used for the lead in your pencil, is made of it, too. The only difference, we know today, is that the carbon atoms have been packed together in a slightly different way. The chemists were fired with enthusiasm: Why not change a cheap and plentiful substance, carbon, into a rare and expensive one, diamond？
You have probably heard about the alchemists who for centuries tried to turn plain lead or iron into gold. They failed because gold is completely different from lead or iron. Transforming carbon into diamonds, however, is not illogical at all. This change takes place in nature, so it should be possible to make it happen in the laboratory.
It should be possible, but for one hundred and fifty years efforts failed. During this period, none the less, several people believed that they had solved the diamond riddle. One of these was a French scientist who produced crystals that seemed to be the real thing. After the man's death, however, a curious rumour began to go the rounds. The story told that one of the scientist's assistants had simply put tiny pieces of genuine diamonds into the carbon mixture. He was bored with the work, and he wanted to make the old chemist happy.
The first real success came more than sixty years later in the laboratories of the General Electric Company. Scientists there had been working for a number of years on a process designed to duplicate nature's work. Far below the earth's surface, carbon is subjected to incredibly heavy pressure and extremely high temperature. Under these conditions the carbon turns into diamonds. For a long time the laboratory attempt failed, simply because no suitable machinery existed. What was needed was some sort of pressure chamber in which the carbon could be subjected to between 800,000 and 1,800,000 pounds of pressure to the square inch, at a temperature of between 200°F and 2,200°F.
Building a pressure chamber that would not break under these conditions was a fantastically difficult feat, but eventually it was done. The scientists eagerly set to work again. Imagine their disappointment when, even with this equipment, they produce all sorts of crystals, but no diamonds. They wondered if the fault lay in the carbon they were using, and so they tried a number of difficult forms. They failed again and again but went on working. The idea was then brought forward that perhaps the carbon needed to be dissolved in a melted metal. The metal might act as a catalyst, which means that it helps a chemical reaction to take place more easily.
This time the carbon was mixed with iron before being placed in the pressure chamber. The pressure was brought up to 1,100,000 pounds to the square inch and the temperature to 900℉. At last the chamber was opened. A number of shiny crystals lay within. These crystals scratched glass, and even diamonds. Light waves passed through them in the same way as they do through diamonds. Carbon dioxide was given off when the crystals were burned. Their density was just 3.5 grams per cubic centimeter, as is true of diamonds. The crystals were analyzed chemically. They were finally studied under X-rays, and there was no longer room for doubt. These jewels of the laboratory were not like diamonds; they were diamonds. They even had the same atomic structure.
The main idea of Paragraph 2 is that______.
A．making artificial diamonds didn't seem very difficult at first sight
B．scientists began to try making synthetic diamond in the late 1700s
C．scientists discovered diamonds are a form. of carbon, a common element
D．the discovery of the diamonds' constitute impelled scientists to make a synthetic one
Already Texas instruments in the United States is developing an electronic translation machine. Imagine a Spanish secretary, for example, who wants to type a letter from the boss to a business man in Sweden. All he or she will have to do is this; first type the letter in Spanish. The letter will appear on a television screen. After a few seconds the translated letter will appear on another television screen in Stockholm in perfect Swedish.
And that's not all. Soon a computer will be able to teach you English, if you really want to learn the language. You'll sit in front of a television screen and practise endless structures. The computer will tell you when you are correct and when you are wrong. It will even talk to you because the silicon chips can change electrical impulses into sounds. And clever programmers can predict the responses you, the learner, are likely to make.
So think of it. You will be able to teach yourself at your own pace. You will waste very little time, and you can work at home. And if after all that, you still can't speak English you can always use the translating machine. In a few years, therefore, perhaps there will be no need for BBC Modern English, or BBC English by Radio programs--no more textbooks or teachers of English. Instead of buying an exciting new textbook, the computer will ask you to replace it with microprocessor one thousand nine hundred and eighty-four. Fast, reliable and efficient language learning and translating facilities will be available to you. Think of that no more tears or embarrassing moments. One little problem is that a computer can't laugh yet-- but the scientists are working on it. Happy learning!
Silicon chips are ______.
A．microprocessors
B．the result of the development of microprocessors
C．the computer itself
D．parts of microprocessors
— __________________
A.I should imagine so.
B.No problem.
C.That' s a good idea.
A.imagine
B.notice
C.examine
D.review
Questions are based on the following passage．
For years， high school students have received identical textbooks as their classmates．Even asstudents have different learning styles and abilities， they are force-fed the same materials．"Imagine adigital textbook where because I"m adifferent person and learn differently， my book is different thanyour book，" said Richard Baraniuk， founder of OpenStax．
OpenStax will spend two years developing the personalized books and then test them on Houston-area students．The books will also go through a review and evaluation process similar to traditionaltextbooks．Baranluk expects 60 people to review each book before publication to ensure its quality．The idea is to make learning easier， so students can go on to more successful careers and lives．
Baraniuk isn"t just reproducing physical textbooks on digital devices， a mistake e-book publishers havemade．He"s seriously rethinking that the educational experience should be in a world of digital tools．Todo this means involving individuals with skills traditionally left out of the textbook business．Baraniuk iscurrently hiring cognitive scientists and machine learning experts．Baraniuk wants to use the tactics of Google， Netfllx and Amazon to deliver a personalized experience．These Web services all rely oncomplex algorithms （算法） to automatically adjust their offerings for customers．Just as Netlix recommends different movies based on your preferences and viewing history， a textbook might present materials at a different pace．The textbook——which will be stored on a range of digital devices——will automatically adjust itself thanks to machine learning．As a student learns about a topic， he or she could be interrupted by brief quizzes that evaluate， whether he or she masters the area．Depending on how the student does， the subject could be reinforce~l with more material．Or a teacher could be automatically e-mailed that the student is struggling with a certain concept and could use some one-on-one attention．This personalized learning experience is possible thanks to the wealth of data a digital textbook cantrack．This data can be used to better track students" progress during a course．Parents and teacherscan monitor a student"s development and provide in time more proper assistm ce．With personalizedlearning methods， our students" talents will be better developed．
What do we learn about personalized books？ 查看材料
A.Their quality will be ensured since they are developed by OpenStax．
B.They will be examined and judged before being published．
C.They will overlook different learning styles and abilities．
D.They will be much similar to traditional textbooks．
What's the attitude scientists toward atomic bomb？ ______.
A．Pleased
B．Worried
C．Disapproved
D．Not mentioned
Scientists will()new methods of increasing the world's food supply
A、set aside
B、go over
C、turn up
D、come up with
