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Passage 43 Sometimes it is impossible to send all the mail that arrives at the post office. Perhaps there is an inadequate or illegible address and there is no return address. The post office cannot just throw the mail away, so it becomes "dead mail". Dead mail is then sent to one of the U.S. Postal Service’s dead mail offices in Atlanta, New York, Philadelphia, St. Paul, and San Francisco. Seventy-five million pieces of mail can end up in these offices in one year. The staff ’of the dead mail offices has different ways to deal with all of these pieces of dead mail. First of all, they look for clues that can help them deliver the mail; they open packages in the hope that something inside will show where the package came from or is going to. (43) Dead mail will also be listed on a computer so that people can call in and cheek to see if a missing item is there. However, all of the mail cannot simply be stored forever: there is just too much of it. When a lot of dead mail has piled up, the dead mail offices hold public auctions. Every three months, the public is invited to the offices and containing items found in dead mail packages are sold to the highest bidder (出价人). The passage indicates that dead mail auctions are held______.
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Passage 41 Three men got to the Dover Railway Station a few minutes after nine o’clock one evening. They asked a guard, "What time is the next train for London" The guard said, "You’ve just missed one. A train goes every hour. The next one is at ten o’clock." "That’s all right," they said. "We’ll go and have a drink." So off they went to a bar. A minute or two after ten o’clock they came running and asked the guard. "Has the train gone" "Yes," the guard said. "It went at ten, and I told you. The next one is at eleven o’clock." "That’s all right," they said again. "We’ll go and have another drink." So they went back to the bar. They missed the eleven o’clock train in the same way. Then the guard said, "No, the next train is the last one. If you miss that train, you won’t get to London tonight." (41) Twelve o’clock came, and the last train was just starting out when the three of them came out of the bar running as fast as they could. Two of them got on the train just as it was leaving but the third one didn’t run fast enough, and the train went out leaving him behind. He stood there looking at the train and laughing, as if to miss a train was the best joke in the world. The guard went up to him and said, "I told you that this was the last train. Why didn’t you come earlier" The man kept laughing until tears came into his eyes. Then he caught hold of the guard and said, "Did you see the two men get into the train and leave me here" "Yes, I did." "Well, I was the only one to leave for London. They were here only to see me off!" The man laughed when he failed to catch the train because______.
Passage 29 The first English window was just a slit in the wall. (29) It was cut long, so that it would let in as much light as possible, and narrow, to keep out the bad weather. However, the slit let in more wind than light. This is why it was called "the wind’s eye". The word window itself comes from two Old Norse words for wind and eye. Before windows were used, the ancient halls and castles of northern Europe and Britain were dark and smoky. Their great rooms were high, with only a hole in the roof to let out the smoke from torches and cooking fires. As time went on, people wanted more light and air in their homes. They made the wind’s eyes wider so as to admit air and light. They stretched canvas across them to keep out the weather. The first window was a______.
Passage 25 Is teaching important Well, of course it is. There was a time when the necessary knowledge could be taught to the young by family members. (25) But as societies became more complex and division of labor more common, it was impossible for family members to teach the information and skills young people needed to become useful members of the society. As the need for specialists appeared, the job of teaching came into being in our society, and teaching as a job has been of increasing importance over the past hundred years. Today, we have strict rules for teachers. We hope all children can attend schools. Many things tell us that teaching is indeed an "important" job. In recent years, there has been an increasing need for teachers to be "responsible". This means that the public expects teachers to succeed in teaching important information to the young. Teachers’ salaries today, while not much, certainly are much higher than they were in years past. These increases have come about because people have realized that without enough salaries, people who have abilities will not become teachers. Today almost no one says that "anybody will do" for a teacher. The public expects "quality people" to teach the young, and progress is being made to give salaries that will make people who have abilities become teachers. "Anybody will do" for a teacher means that______.
Passage 18 We all know that it is possible for ordinary people to make their homes on the equator (赤道), although often they may feel uncomfortably hot there. Millions do it. But as for the North Pole (北极)-we know that it is not only a dangerously cold place, but that people like you and me would find it quite impossible to live there. At the present time only the scientists and explorers can do so, and they use special equipment. Men had been traveling across and around the equator on wheels, on their feet or in ships for thousands of years; but only a few men, with great difficulty and in very recent time, have ever crossed the ice to the North Pole. So it may surprise you to learn that, when traveling by air, it is really safer to fly over the North Pole than over the equator. Of course, this is not true about landings in the polar region (which passenger planes do not make), but the weather, if we are flying at a height of 5, 000 meters above the Pole, is a delight. At 4, 000 meters and more above the earth you can always be sure that you will not see a cloud in the sky as far as the eye can reach. In the tropics (热带), on the other hand, you are not certain to keep clear of bad weather even at such heights as 18,000 or 20,000 meters. Planes can’t climb as high or as quickly in cold air as in warm air. Nor can clouds. (18) In practice, this is an advantage to the plane, which is already at a good height when it reaches the polar region and so does not need to climb, while at the same time cold air keeps the clouds down low. Planes usually do not need to climb quickly or fly high in the polar region because______.
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