单选题Under no circumstances ______ leave his post.

单选题If only I ______ taller, I might be better at basketball.

单选题Compared with "paperbacks", as is suggested in this passage, "proper" books are ______.

单选题{{B}}Passage 3{{/B}} In 1995 about 700,000 robots were operating in the industrialized world. Over 500,000 were used in Japan, about 120,000 in Western Europe, and about 60,000 in the United States. Many robot applications are for tasks that are either dangerous or unpleasant for human beings. In medical laboratories, robots handle potentially dangerous materials, such as blood or urine samples(尿样). In other cases, robots are used in repetitive, unchangeable tasks in which human performance might degrade over time. Robots can perform these repetitive, high-precision operations 24 hours a day without fatigue. A major user of robots is the automobile industry. General Motors Corporation uses approximately 16,000 robots for tasks such as spot welding(点焊), painting, machine loading, parts transfer, and assembly. Assembly is one of the fastest gnawing industrial applications of robotics. It requires higher precision than welding or painting and depends on low-cost sensor systems and powerful inexpensive computers. Robots are used in electronic assembly where they load microchips on circuit boards. Activities in environments that cause great danger to humans, such as locating sunken ships, cleanup of nuclear waste, exploring for underwater mineral deposits, and active volcano exploration, are ideally suited to robots. Similarly, robots can explore distant planets. NASA's Galileo, an unmanned space probe, traveled to Jupiter in 1996 and performed tasks such as determining the chemical content of the Jovian atmosphere. Robots are being used to assist surgeons in installing artificial hips, and very high-precision robots can help surgeons with delicate operations on the human eye.

单选题Automobiles must have certain safety devices such as seat belts and good brakes.

单选题Only under special circumstances ______ to take make-up tests.

单选题We refer to your letter of the twentieth of this month, in which you ask for more favorite terms.

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单选题The mother didn't know who ______ for the broken window.

单选题He has in mind not a particular group of readers but men and women in general．

单选题Every human being, no matter what he is doing, gives off body heat. The usual problem is how to dispose(处理) of it. But the designers of the Johnstown campus of the University of Pittsburgh set themselves the opposite problem-how to collect body heat. They have designed a collection system which utilizes not only body heat, but the heat given off by such objects as light bulbs(灯泡) and refrigerators as well. The system works so well that no conventional(常规的) fuel is needed to make the campus"s six buildings comfortable. Some parts of most modern buildings-theaters and offices as well as classrooms are more than amply heated by people and lights and sometimes must be air-conditioned even in winter. The technique of saving heat and redistributing it is called "heat recovery." A few modern buildings recover heat, but the University"s system is the first to recover heat from some buildings and re-use it in others. Along the way, pit has learned a great deal about some of its heat producers. The harder a student studies, the more heat his body gives off. Male students emit(发出) more heat than female students, and the larger a student, the more heat he produces. It is tempting to conclude that the hottest prospect for the Johnstown campus would be a hardworking, overweight male genius(天才).

单选题The ______ prosperous the city becomes, the ______ pleasant it is to live in.

单选题BSection A/BBDirections:/BI This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. Both the dialogues and questions will be spoken only once. When you hear a question, you should decide on the correct answer from the 4 choices marked A, B, C and D given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center./I

单选题They usually have less money at the end of the project than ______ at the beginning.

单选题Very little ______ they had made an important discovery in science.

单选题Size 10 is ______tight for my daughter. Show me a wider pair. A. very B. so C.too D. quite

单选题By February next year this foreign expert ______ here on this job for five years. A. will have been B. has been C. will be D. is being

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