单选题The book is ______ difficult for me. Can you show me some others? [A]very [B]not [C]too

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单选题From the first paragraph, we learn that the writer was busy ______.

单选题To fight a noise by making more noise sounds strange, but that's exactly what motor engineers are doing in Germany and some other countries. Carmaker's research and development laboratories have already proved that mixing more noise with the help of loudspeakers can reduce the unwanted noise. Physicists have known about the technique for a long time. Sound is made up of pressure waves in the air. If two sound waves of the same frequency (频率) mix so that the highest point of one wave happens at the same time as the lowest point of the other wave, the result is no sound. Therefore, by producing a perfect copy of the noise and delaying it by half a wave cycle (周期), we can kill the unwanted noise. Using this technique many carmakers are racing to develop noise killing systems (系统) both inside and outside the cars. Another good thing about the use of noise killing systems is that it saves the need for a silencer; this not only reduces the weight of a car, but also makes the motor burn less fuel and work better. Some engineers believe that the noise killing system will be used in most cars within a few years. But the carmakers haven't decided if they will carry it into production because it would add several hundred dollars to the cost of their cars.

单选题Jenny ______ have kept her word. I wonder why she changed her mind.

单选题Several leaves were found______when the book______me.[A] missing; returned[B] lost; was returned[C] gone; was returned to[D] disappeared; was returned to

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单选题When I got to the museum, I found it ______ with people.

单选题—I'd rather have some wine, if you don't mind. — ______. A. No, you'd better not B. Not at all, anything you want C. Thank you all the same D. Yes, but not good

单选题With the three ships ______ to him by the Queen of Spain, Columbus sailed west.[A] giving[B] gave[C] being given[D] given

单选题The old lady prefers ______ TV to going to the cinema. A.watching B.seeing C.noticing D.to watch

单选题Careful and careless are as different as fire and water. But strangely enough many scientists have both these qualities, that is, they are both careful and careless. Newton, the famous English scientist, was such a person. Once Newton invited a friend to a dinner at home. When they were ready to eat, Newton still didn't come back. Finally his friend found Newton in his lab. The reason was that when Newton was going to get the bottle of wine, he suddenly had a new idea for the experiment he was doing, so he completely forgot his friend and the dinner. There was another time when Newton was leading a horse up a mountain, holding the rein (缰绳) in his hand. While he was walking, he kept thinking of problems he had met in his studies. When he got to the top of the mountain he found that the rein was not in his hand and that the horse was gone. Among scientists, there are many people like Newton. Einstein was one. Once he was waiting for a friend at a bridge. While waiting, he became lost in thought. It started to rain. The rain kept on for some time. When Einstein took out a piece of paper from his pocket to write something down, the paper was wet and then he realized that it was raining. His clothes had become completely wet. But after he put the paper into his pocket, he again forgot he was standing in the rain. Many scientists are careless about how they live. This is because they are too careful in their studies.

单选题— ______I tell the head teacher all that has happened? —No, you ______! Mr. Xin would be terribly angry. A. Will; needn't B. Would; can C. Should; mustn't D. Must; don't have to

单选题—Do you know Jim quarrelled with his brother? —I don't know, ______.

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单选题Do you know insurance(保险)? Buying insurance is a (36) by which people can protect themselves (37) large losses. Protection against fire is one kind of insurance. Large numbers of people pay (38) sums of money to an insurance company. Although thousands of people have paid for fire insurance, only (39) will lose their homes by fire. The insurance Company will pay for these homes out of the sums of money it has (40) . The first modern fire insurance company was (41) in London, England, in 1666. A great fire had just (42) most of the cities, and people wanted protection against (43) losses. The first company (44) rapidly. Soon other companies were founded in other areas. Benjamin Franklin helped form the first fire insurance company in America in 1752. He also (45) a new kind of insurance for (46) . The new insurance would offer protection against the loss of crops (47) storms. In 1975, Benjamin Franklin helped start (48) new insurance company in America. This company, (49) offered life insurance, collected some money (50) from many different men. (51) a man died, his family was given a large sum of money. Today, this company is (52) in business. Over the years, people have (53) from many new kinds of insurance when they have suffered from (54) accidents as car and plane crashes. (55) , almost everyone has some kinds of insurance.