单选题Museums have changed a lot. They are no longer places that people "should go" but places people enjoy. At a science museum in Canada, you can feel your hair stand on end as harmless electricity passes through your body. At the children's museum in New York, you can play an African drum. There are no "Do Not Touch" signs in many museums in the USA. More and more museum directors have realized that people can learn best when they become part of what they are seeing. In many science museums, visitors are encouraged to touch, listen, operate and experiment so that they can discover scientific rules for themselves. The purpose is not only to interest the visitors, but also help them feel at home in the world of science. If people don't understand science, they will be afraid of it; and if they are afraid of science, they will not make the best use of it. One cause of all these changes is the increase in wealth and spare time. Another cause is the growing number of young people in the population. Many of them are college students or college graduates. They see things in quite a new different way. They want art in which they can take part. The same is true of science and history. The old museums have been changing and the government is encouraging the building of new, modern museums. There are more than 6 000 museums in the United States and Canada, almost twice as many as there were 25 years ago.

单选题______President turned out to be another man after he was elected______president.

单选题The program ______ into the computer must be prepared in a specially designed machine language.[A] to pelt[B] was put[C] to be put[D] putting

单选题We can learn from the text that ______.

单选题All mobile phones must be turned off from when the aircraft doors are closed ______ the doors open again on arrival.

单选题The middle-aged man was seen ______ out of the house on the afternoon of the murder.

单选题The horse came into existence before man on earth. Although the earliest remains of primitive horses have been found on the North American continent, many scientists believe this small species traveled over a land mass. It became extinct (绝种的) in America. Other scientists believe that the horse may have originated in Asia. In any event the animal soon spread into China, Europe, and the Middle East. The first modem horse to be introduced into the American continent came with the early Spanish explorers. Horses were bred into many types. The heavy horses developed in the low countries of Europe and were used for work and by the medieval knights (中世纪骑士) to fide. The oldest breed of horses is said to be the Arabian. The only true wild horses left in 20th century are found in Mongolia. Horses are said to rate in intelligence after the ape, the elephant, the dog. They have excellent memories and can sometimes find their way home when lost, and sense danger better than their masters. The early civilizations of man that had made use of the horse developed more rapidly than those which had not.

单选题He is ______ a writer as a reporter.

单选题______ everywhere, the foxes had no where ______ themselves. A. Hunting; hiding B. To hunt; to hide C. Hunted; hiding D. Hunted; to hide

单选题The underlined phrase "in good hands" means ______.

单选题Which of the following statements is NOT TRUE?

单选题{{B}}D{{/B}} 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. Car makers' 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Unlike watching TV, reading is a highly active process(过程) ______ it requires attention as well as memory and imagination.

单选题The priest asked the only listener if he would be willing to have a shortened service. This suggests ________.

单选题一Are you suggesting that education holds the key to our future? 一 ____.

单选题Little ______ that the police are about to arrest him. A. he is known B. did he know C. does he know D. is he known