题目内容
With tremendous force a great mass of solid rock suddenly moves deep inside the earth. Shock waves travel upward, and the surface of the earth begins to tremble, ff the trembling is very strong, trees sway and fall, houses collapse, bridges twist and slide into rivers. In cities, fires start as gas lines break. With a loud rear, the ground splits open. Earthquake!
Experts cannot tell when earthquakes will occur. But they can tell us why they happen. In the center of the earth a huge, hot mass moves constantly, like rushing water. Vast areas of solid rock, called plates(板岩), rest on top of this mass. Sometimes two plates move and strain against each other. When they finally break, the earth's surface moves, and an earthquake begins. Some quakes have other causes.
Most of the world's earthquakes happen around or in the Pacific Ocean. Called the "ring of fire" by scientists, this area suffers from about twenty powerful earthquakes each year. But there are others even too small to be felt. They occur a million times a year. However, they take place under the ocean or away from people. Therefore, there is no damage.
Scientists measure the strength of earthquakes with sensitive machines called seismographs(地震仪). These instruments can record shock waves from earthquakes in any part of the world. Seismographs show us that some earthquakes can give off as much energy as 200 million tons of TNT. That is 10,000 times stronger than an atomic bomb!
Powerful earthquakes can sometimes take an enormous number of human lives. The worst earthquake on record took place in China in 1556. At that time 830,000 people died. In 1737, 300,000 were killed during an earthquake in India. In modern times, China was hit again with the world's second worst quake in 1976. It left 650,000 dead.
Many cities are taking steps to prevent loss of life in earthquakes. Buildings are being made quakeproof. Rescue teams practice saving victims. Partly because of such steps, the 1989 San Francisco quake took only sixty lives.
We can infer from the passage that ______.
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Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文： Florida International University has opened what it says is the first computer art museum in the United States. You don't have to visit the university to see the art, you just need a computer linked to a telephone. You call the telephone number of a university computer and connect your own computer to it. All of the art is stored in the school computer. It is computer art, created electronically by artist on their own computers. In only a few minutes, your computer can receive and copy all the pictures and drawings.
Robert Shostak is director of the new computer museum. He says he started the museum because computer artists had no place to show their work and he just wants to help them to some extent.
A computer artist could only retard his pictures electronically and send the records, or floppy discs, to others to see on their computers. He could also put his pictures on paper. But to print good pictures on paper, the computer artist needed an expensive laser printer.
(27)
A．At supper-time.B．Before Jane went to bed.C．Around eleven.D．After midnight.
听力原文：M: Hi, Jane...Say, are you OK？ You've looking a bit tired.
W: Oh, I am. It's my neighbors.
M: Oh, so they're acting up again. Huh？
W: Unfortunately, yes, they are.
M: Loud music？
W: Not exactly. You've been to my apartment, right？
M: Yeah, I've been there once. It's a nice place.
W: Well, thank you. So you remember I live on the top floor. Well, last night, around eleven, my neighbors decided to go up on the roof of my apartment building!
M: The roof？ Really？
W: Yeah. They had this guy in from out of town and they wanted to show him the view! Can you believe it？ I'm soundly asleep, and all of a sudden I hear "stomp, stomp, stomp!" They're walking around on the roof. It sounded like my ceiling was going to fall in.
M: So what did you do？
W: Well, after about ten minutes, I got dressed and went up there to tell them to be quiet. I was so mad. Then of course after that, I couldn't go back to sleep.
M: Oh, don't you hate when that happens？ You can't fall asleep, and then before you know it, it's morning and the alarm clock is going off.
(20)
A．To watch the night scenes.B．To look up at the stars.C．To clean up the roof.D．To show
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