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

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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.

单选题Nothing healthful should be omitted from the meal of a child because of a ______ dislike.

单选题What would happen if students were ______ of books?

单选题It is not that he does not like Paris. The reason why he did not go to Paris last summer was that he could not ______ the time.

单选题He is ______ a history student at Harvard University. A. in time B. at present C. at a time D. at once

单选题His expression on his face showed that he cannot ______ being laughed at any more.

单选题Before any passenger can get on an airplane at the airport, he must go through security checks to make sure he ________ anything dangerous.

单选题This is ______ movie I have ever seen. A. very amazing B. the most amazing C. a most amazed D. more amazed

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单选题No sooner ______ we ______ this conclusion than they agreed to it. A. would...reachB. did...reach C. were...reachingD. had...reached

单选题We have arranged to go to the cinema on Friday, but we can be ______ and go another day.

单选题It ______ snowing all afternoon.

单选题 Can money buy happiness? Many Americans think {{U}} {{U}} 1 {{/U}} {{/U}}--at least they act as though they {{U}} {{U}} 2 {{/U}} {{/U}}. Americans believe in the right {{U}} {{U}} 3 {{/U}} {{/U}}"life, liberty and the pursuit of happiness. " And just what does the pursuit of happiness mean? For many, it means pursuing money. Success- oriented Americans often {{U}} {{U}} 4 {{/U}} {{/U}}people's worth by how much they have. For that reason, {{U}} {{U}} 5 {{/U}} {{/U}}the Joneses has become almost a fulltime occupation. Why do Americans emphasize money so much? Well, this "land of plenty" has long enjoyed {{U}} {{U}} 6 {{/U}} {{/U}}natural resources, and people have gotten used to {{U}} {{U}} 7 {{/U}} {{/U}}wealth. {{U}} {{U}} 8 {{/U}} {{/U}}, Americans believe that everyone has an equal opportunity to succeed. People aren't bound by social class. They can work hard and improve their status. Many immigrants have come to this land of opportunity for that reason--to {{U}} {{U}} 9 {{/U}} {{/U}}a better future. This belief {{U}} {{U}} 10 {{/U}} {{/U}}equal opportunity has produced a spirit of competition. It's like a race to the top of the success ladder. So what do Americans do {{U}} {{U}} 11 {{/U}} {{/U}}their money? For one thing, they have to manage it. Families often {{U}} {{U}} 12 {{/U}} {{/U}}careful financial records. Many of them {{U}} {{U}} 13 {{/U}} {{/U}}their income. They plan for basic expenses like housing, food, clothes, transportation and medical bills. Americans save room in their budget for fun. They spend three times {{U}} {{U}} 14 {{/U}} {{/U}}on recreation as on education. {{U}} {{U}} 15 {{/U}} {{/U}}average, Americans save around 5 percent of their income. Some find ways to invest their money. Not all Americans are rich, but most are concerned about money. Even a casual observer {{U}} {{U}} 16 {{/U}} {{/U}}notice that America is a consumer society. The media bombard people with advertisements. Commercials interrupt TV and radio programs with catchy appeals to go out and buy. Shopping has {{U}} {{U}} 17 {{/U}} {{/U}}replaced baseball as the national pastime. {{U}} {{U}} 18 {{/U}} {{/U}}, Americans realize that life is {{U}} {{U}} 19 {{/U}} {{/U}}having things. Volunteering and giving to charity organizations occupy part of Americans' time and money as well. Deep down, they realize that happiness can't be bought,{{U}} {{U}} 20 {{/U}} {{/U}}it can be given away.