The goal of earthquake prediction is to give early enough warning. The U.S. Geological Survey conducts and supports research on the likelihood of future earthquakes. Scientists estimate earthquake probabilities in two ways: by studying the history of large earthquakes in a special area and the rate at which strain(拉力)accumulates(积累)in the rock.
Scientists study the past frequency of large earthquakes in order to determine the future likelihood of similar large shocks. For example scientists researched the large earthquakes in the San Francisco Bay region during the 75 years between 1836 and 1911. For the next 68 years, no earthquakes of magnitude (震级) 6 or large occurred in the region. Beginning with a magnitude 6 shock in 1979, the earthquakes in the region increased dramatically; between 1979 and 1989, there were four magnitude 6 or greater earthquakes, including a magnitude 7.1 earthquake. So scientists estimated that the probability of a magnitude 6.8 or larger earthquake occurring during the next 30 years in the region is about 67 percent.
Another way to predict earthquakes is to study how fast strain accumulates. When plate movements build the strain in rocks to a critical level, like pulling a rubber band too tight, the rocks will suddenly break and slip to a new position. Scientists measure how much strain accumulates along a fault (断层) each year, how much time has passed since the last earthquake, and how much strain was released in the last earthquake. This information is used to calculate the time required for the accumulating strain to build to the level that results in an earthquake. This simple model is so complicated that such detailed information about faults is rare. In the United States, only the San Andreas Fault System has adequate records for using this prediction method.
Scientific understanding of earthquakes is of vital importance to the Nation. As the population increases, expanding urban development and construction encroach (侵蚀) upon areas susceptible(易受影响的) to earthquakes. With a greater understanding of the causes and effects of earthquakes, we may be able to reduce damage and loss of life from this destruction.What does the passage mainly talk about?
A.What an earthquake is like. |
B.How to predict earthquakes. |
C.Where earthquakes often happen. |
D.When a fault is formed. |
That scientists study the history of large earthquakes in certain areas is to ultimately_________.
A.do research on the past frequency of large earthquakes |
B.estimate the magnitude of similar earthquakes |
C.forecast the possibilities of similar earthquakes |
D.judge the specific location of future earthquakes |
Which is TRUE according to the passage?
A.There were four magnitude 6 earthquakes in the San Francisco Bay region between1979 and1989. |
B.The accumulating strain of the fault to a certain level results in the earthquake. |
C.About 68 years after 1911, no earthquakes occurred in the San Francisco Bay region. |
D.The fast increasing population on the earth is the main cause of the earthquake. |
What is the critical factor of forming a fault?
A.The material of rocks. |
B.The existing time span of the rocks. |
C.The plate movements around the rocks. |
D.The amount of strain released in the last earthquake. |
According to the passage, we can know that the San Andreas Fault System____.
A.has a greater understanding of the causes and effects of earthquakes |
B.stores much more information about the history of large earthquakes |
C.offers the potential for doing research on the faults where strain accumulates |
D.illustrates specifically how rocks along a fault are formed |
(三)
A
I recently spent two years in the Arctic filming the series Blue Planet. I love being in an environment that hasn't changed for 20,000 years. Of course it's freezing, but it must be a healthy place because you never catch colds.
When I'm filming, I like to really feel how lonely the environment is. Filming underwater involves cutting through thick ice and diving in tied to a line. The person at the other end has to be ready to pull you out fast if necessary.
Originally I was a research diver for the British Antarctic Survey project, but for me science lacked excitement. I'd always enjoyed photography, and whenever camera teams passed through, they encouraged me to watch and learn. I was then able to move into filming in 1985 and have concentrated on Arctic and Antarctic wildlife ever since.
I prefer to be faced with the animals I'm filming. I haven't got in the water with killer whales yet, but I plan to. Of course, it's dangerous if you choose the wrong moment. They're big animals and can move fast, so I'd be stupid to film them searching for food!
I've never had problems with polar bears, although once I was frightened when one tried to get into my tent. Polar bears are bold, clever and dangerous. But I made this one see I wasn't about to attack it - I'm sure it realised I wouldn't hurt it.
When I come home back from my trips, I work in the mornings and spend the afternoons swimming to keep fit. Now I'm fifty, filming is harder. The challenge for me is to continue to deliver high-quality work.
56. In this text, the writer is describing __________.
A. the challenges of the environment he works in B. the beautiful scenery of the Arctic
C. the career opportunities in TV camera work. D. the difficulties of having to work alone
57. What does the writer say about his early career?
A. He was bored by working only in Antarctic.
B. It taught him how to become a skilled diver.
C. He wasted the years he spent as a scientist.
D. It provided him with a chance to learn about filming.
58. When talking about killer whales, the writer says that __________.
A. he has always been careful when diving with them
B. he tries to avoid any danger by facing them
C. he will only film them from a safe distance
D. he believes there are safe opportunities to film them
59. How does the writer describe his experience with a polar bear?
A. The writer realized he was wrong to trust polar bears.
B. The writer felt nervous that the bear might come back.
C. The bear seemed to know the writer wasn’t a danger.
D. The animal was much more afraid than the writer was.
D
We all know what it is like to be unable to turn your head because of a cold in the muscles of your neck, or because an unexpected twist has made your neck ache and stiff. Your whole body feels tight. The slightest move makes you jump with pain. Nothing could be worse than a pain in the neck.
That is why we use phrase to describe some people who give you the same feeling. We have all met such people.
One is the man who always seems to be clapping his hands—often at the wrong time—during a performance in the theater. He keeps you from hearing the actors.
Even worse are those who can never arrive before the curtain goes up and play begins. They come hurrying down to your row of seats. You are comfortably settled down, with your hat and heavy coat in your lap. You must stand up to ;et them pass. You are proud of your self—control after they have settled into their seats…Well, what now…Good God, one of them is up again. He forgot to go to the men’s room, and once more you have to stand up, hanging on to your hat and coat to let him pass. Now, that is “a pain in the neck.”
Another, well—known to us all, is the person sitting behind you in the movies. His mouth is full of popcorn; he is chewing loudly, or talking between bites to friends next to him. None of them remain still. Up and down, back and forth, they go—for another bag of popcorn, or something to drink.
Then, there is the main sitting next to you at a lunch counter smoking a smelly cigar. He wants you to enjoy it too, and blows smoke across you food into your mouth.
We must not forget the man who comes into a bus or subway car and sits down next to you, just as close as you will let him. You are reading the newspaper and he leans over and stretches his rock so that he can read the paper with you. He may even turn the paper to the next page before you are ready for it.
We also call such a person a “rubber neck,” always stretching his neck to where it does not belong, like neighbors who watch all your visitors. They enjoy invading your privacy. People have a strong dislike for rubbernecks. They hate being spied upon.
68.Where can you find this passage?
A.Medicine dictionaries. B.Social science books,
C.Kids’ comic books. D.Science text books.
69.How do you feel when late comers walk back and forth in front of you in a cinema?
A.Ignored. B.Bored. C.Disturbed D.Relaxed.
70.A “rubber neck” often .
A.says bad words behind people.
B.quarrels face to face with neighbors.
C.bargains the price with sales women
D.asks about other people’s business
71.Which of the follow is a “pain on the neck”?
A.Someone who helps you find your seat in a movie theatre.
B.Someone who smokes in a smoking section on a train.
C.Someone who throws trash out of his car window on the highway.
D.Someone who goes to the doctor for his severe pain on the neck.