题目内容
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： A deadly infectious outbreak swept through a small city in Zaire, Africa last spring, killing more than one hundred people. The killer was a rare virus that caused most victims to bleed to death. As scientists rushed to control the outbreak, people in the U.S. wondered "Could it attack here." "We are foolish if we think it couldn't come to our country," say doctors. The virus can be highly infectious. If you come in contact with a victim' s blood or other body fluids, you can get
sick, too. All it takes is one infected person to start such a disease. That' s what scientists believe happened in Zaire. The healthcare workers who treated the first victims there soon fell ill too. The problem was: they had no protective equipment to prevent themselves from being infected. International rescue workers brought equipment to Zaire soon after the out- break occurred. Now the disease appears to be under control. One big mystery is that no one knows where the virus comes from or where it will strike next. Some scientists say that the virus lies inactive in the cells of some kind of plant, insect or other animals, Then it somehow finds a way to infect humans. Scientists are now headed into the jungles of Africa to find out where the virus lives. Once they find the virus, they also hope to find ways to combat it.
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SECTION B PASSAGES
Directions: In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.
听力原文： Men are the cleverest and most dangerous animals on earth. Rats come second. Men kill their enemies. They have killed millions of men since ancient times--but rats have killed hundreds of millions of men. Rats carry diseases. Black rats carry fleas, and these fleas give men bubonic plague. Bubonic plague still kills thousands of Asians and Africans today--as it killed millions of Europeans in the past, until brown rats came to Europe and pushed the black rats out. There is no plague in Europe today, but brown rats carry thirty-five other diseases. One of them has killed 200 million people in the last 400 years. Rats are dangerous. They not only carry diseases into men's homes, they also take men's food. They eat 33 million tons of grain every year. That is enough to feed 200 million people--so men die of hunger because rats eat their food. Rats are clever, too. They have good leaders. Men try to poison them, but if their leaders tell them that food is dangerous, they do not eat it, so our cities and villages are full of rats. We can go to the moon, but we cannot kill this dangerous enemy. Why？ Is it because we are not clean？
There are no black rats in Europe today because
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