单选题 Humans have been interested in how birds fly since the dawn of history. And they have long been studying the flight of birds and trying to copy it. Not until the twentieth century did engineers fully understand the principles (原理) of flight that birds have already been using for millions of years. Birds are adapted (适应) in their body structure, as no other living things, to live in the air. Their wings, tails, light and hollow (空的) bones, and internal air sacs (体内气囊) all help to this great ability. These adaptations make it possible for birds to seek out environments most favorable to their needs at different times of the year. This results in migration—the regular, seasonal movement of the whole population of birds from one geographic location (地点) to another. Each year with great regularity most species (品种) of birds return to their summer homes, hoping to court (求偶), choose mates, build their small comfortable homes, and lay eggs, as well as bring up their young. In the late summer and fall they get their new feathers. And then they join with other birds of their kind in large and small flocks (群), feeding and storing up fat in their bodies. In this way, they are well prepared for the hardships of winter, whether they decide to remain in the cold northlands or make the strength-wasting journey to the south.

单选题HowisDavid'snewhouse?

单选题Computer programmer Brendan Tammy earned ￡55,000 a year by designing new com-puter games, yet he cannot find a bank prepared to let him have a check card. Instead, he has been told to wait another two years until he is 18. He works for a small company in Liverpool, where most young people of his age are looking for jobs. Brendan's biggest headache is how to use his money. Though he has high payment, he cannot drive a car, or get credit cards (信用卡). Brendan got his job four months ago, a year after leaving school with six O-levels (普通考试科目) and working for a time in a computer shop.“I got the job because the people who run the company knew I had already written some programs." he said. "I suppose 55,000 pounds sounds a lot but I hope it will come to more than that this year." He spends some of his money on records and clothes, and gives his mother 20 pounds a week as he lives with his parents. But most of his spare time is spent working. "Unfortunately, computing was not part of our studies at school," he said. "But I had been studying it in books and magazines for four years in my spare time. ! knew what I wanted to do and never considered staying on at school. Most people in this business are fairly young, anyway. I would like to earn a million and I suppose early retirement (退休) is a possibility. You never know when the market might disappear./

单选题I think girls can be ______ they want to be, whether it is a pilot or a manager.

单选题Scotland is ______ the north of England and ______ the north of Britain.[A] to; to[B] in; in[C] in; to[D] to; in

单选题Long hours at the screen can cause aching eyes, blurred vision and headaches, experts say. In fact, eyestrain surpasses even wrist pain as the top physical complaint among heavy computer users. When peering into the computer screen, the eye's focusing muscle is at constant tension. Like any muscle, it feels sore when overloaded. And when someone spends a lot of time looking at something close, the eye muscle can get stuck on the near-focus setting and have difficulty relaxing, leaving the person temporarily nearsighted, a condition called accommodative spasm(痉挛) that can last seconds or hours. This is why after looking at a monitor all day, some computer workers complain that their distance vision is blurred when they attempt to drive home. The letters on the screen are not as clearly defined as on a printed page. Take a magnifying glass to your monitor and you'll see the letters, each made up of pinpoint sources of light, have no sharp edges. But those liquid crystal display (LCD) monitors, like those found on laptop computers, are easier on the eyes because they display sharper images. And studies have shown that when people are working on a computer, their rate of blinking goes down by two-thirds, which can result in dry, stinging eyes. This is especially a problem for contact-lenses wearers.

单选题My sister(together)with my parents ______ invited to. the concert.

单选题--Is Mrs White in the office? --Yes, ______ she is on duty, she must be there.[A] since[B] until[C] for[D] if

单选题Laws that punish parents for their little children"s actions against the laws get parents ______.

单选题Difficult as the task was, he______it in time.[A] worked[B] did[C] worked on[D] finished

单选题Last week the couple revisited the city ______ they spent their first holiday.[A] in that[B] which[C] where[D] when

单选题Whereisthetalktakingplace?

单选题I must buy something for the party, as there is hardly ______ left in the fridge.

单选题From the passage, we know that man must ______.

单选题Liz won't be at work next week—______a well-earned break.

单选题In reading mathematics problems, you should first read to understand the general meaning of the problem and question to be answered. At first you need not notice the exact figures given. Look at the following problem. James wants to buy a pair of roller skates that were priced at $6.50. One day he saw the price had been reduced to $5.25. He has $4.50. How much more money does he need to pay for the skates? The first reading of this problem might be as follows: James wants to buy a pair of roller skates that were priced at a certain amount. One day he saw that the price had fallen. How much more money does he need to pay for the skates? From the reading you can decide that you must subtract (减去) what James has from the cost of the skates to answer the question. Then look at the problem and get the exact figures. You will notice that you do not need to know the original price of the skates.

单选题I wonder why Jenny______ us recently. We should have heard from her by now.

单选题—Sorry for not phoning you.[A] Please don't worry.[B] No, Iwon't.[C] I quite understand.[D] That's quite all right.