单选题Only when we hurried to the airport ______ the flight was cancelled.

单选题This hotel ______ $60 for a single room with bath.

单选题While she ______, she kept checking her shopping list.

单选题Seldom ______ any mistakes during my past ten years of service here.

单选题It will ______ us one hour to walk from the bus station to that park.

单选题Look at the terrible situation I am in now! If only I ______ your advice.

单选题In Britain there is a National Health Service (NHS) which is paid for by taxes and National Insurance, and in general people do not have to pay for medical treatment. Every person is registered with a doctor in his or her local area, known as a general practitioner(全科医生) or GP. This means that their names are on the GP"s list, and they may make an appointment to see the doctor or may call the doctor out to visit them if they are ill. People sometimes do have to pay part of the cost of drugs that the doctor prescribes. GPs are trained in general medicine but are not specialists in any particular subject. If a patient needs to see a specialist doctor, they must first go to their GP and then the GP will make an appointment for the patient to see a specialist at a hospital or clinic. Although everyone in Britain can have free treatment under the NHS, it is also possible for him to have treatment done privately, for which he has to pay. Some people have private health insurance to help them pay for private treatment. Under the NHS, people who need to go to hospital may have to wait for a long time on a waiting list for their treatment. Anyone who is very ill can call an ambulance(救护车) and get taken to hospital for free urgent medical treatment. Ambulances are a free service in Britain.

单选题You ______ have come so early.

单选题He will have ______ 30 by the end of this year.

单选题The conclusion of your paper is not ______ to the topic.

单选题After my father stopped working, his physical condition ______ worse.

单选题Some psychologists maintain that mental acts such as thinking are not performed in the brain alone, but that one"s muscles also participate. It may be said that we think with our muscles in somewhat the same way that we listen to music with our bodies. You surely are not surprised to be told that you usually listen to music not only with your ears but with your whole body. Few people can listen to music that is more or less familiar without moving their body or, more specifically, some part of their body. Often when one listens to a symphony concert on the radio, he is tempted to direct the orchestra(交响乐) even though he knows that there is a competent conductor on the job. Strange as this behavior may be, there is a very good reason for it. One cannot derive all possible enjoyment from music unless he participates, so to speak, in its performance. The listener "feels" himself into the music with more or less pronounced motions of his body. The muscles of the body actually participate in the mental process of thinking in the same way but this participation is less obvious because it is less pronounced.

单选题The trees can ______ part of the heat from the sun.

单选题

单选题I wish I ______ as slim as you.

单选题All the arrangements should be completed ______ your departure.

单选题Her heart ______ faster when she entered the exam hall. A. jumped B. sank C. beat D. hit

单选题 "Time cannot be added to a person's life, but it can be made more valuable by avoiding waste. " This was the philosophy of a man who devoted most of his time to the creation of new plants: Luther Burbank, the plant magician. Burbank has been called the plant magician because he could do things with plants which were as amazing as the tricks of a magician. He truly astonished the world with his achievements in the development of many kinds of plants, such as giant fruits with new flavors and trees which grew faster than their ancestors. These, and many more achievements, were of great economic value and benefit to people all over the world. In his lifetime of seventy-seven years Burbank became an American legend. He began life in 1849 on a farm in the state of Massachusetts. It was the same year that men across the continent in California discovered gold, that precious metal so eagerly sought after in the earth. Eventually Burbank would follow them. But he would spend his life drawing a different treasure from the same California earth: a wealth of new plants and fruits. The Massachusetts countryside may have provided young Burbank with a feeling for the mysteries of nature, but his scientific training came during the visits of an uncle who was a scientist. Through his uncle, Luther met the famous naturalist, Louis Agassiz. Agassiz introduced him to the complicated process by which plants grow, such as the steps in the making of seeds from pollen (花粉) carried by insects, by birds, by the very winds of the field. Attracted by the ways of nature, Burbank took his first steps into the work that was to occupy his whole life.

单选题He felt it ______ to be a director of the office in this big company. A. challenging B. being challenged C. challenged D. to be challenged

单选题A computer is a machine designed to perform work mathematically and to store and select information that has been fed into it. It is run by either mechanical or electronic means. These machines can do a great deal of complicated work in a very short time. A large computer, for example, can add or subtract nine thousand times a second, multiply a thousand times a second, or divide five hundred times a second. Its percentage of error is about one in a billion digits. It has been estimated that human beings making calculations average about one mistake per two hundred digits. The heart of an electronic computer lies in its vacuum tubes, or transistors. Its electronic circuits work a thousand times faster than the nerve cells in the human brain. A problem that might take a human being two years to solve can be solved by a computer in one minute, but in order to work properly, a computer must be given instructions—it must be programmed. Computers can be designed for many specialized purposes—they can be used to prepare payrolls(工资单), guide airplane flights, direct traffic, even to play chess. Computers play an essential role in modern automation in many plants and factories throughout the world.