单选题The duty of a soldier is to Udefend/U his country.

单选题Cathleen: Let's take a coffee break, shall we?Yolanda: ______ , but I can't.

单选题Speaker A: Sorry about all the inconvenience. Speaker B: ______.

单选题My brother likes eating very much but he isn't very ______ about the food he eats.

单选题I managed to talk down the price and bought the coat ______ the discount of 20 percent.

单选题In recent years a new farming revolution has begun, one that involves the (1) of life at a fundamental level—the gene. The study of genetics has (2) a new industry called biotechnology. As the name suggest, it (3) biology and modem technology through such techniques as genetic engineering. Some of the new biotech companies specialize in agriculture and are working feverishly to (4) seeds that give a high yield, that (5) diseases, drought and frost, and that reduce the need for (6) chemicals. If such goals could be achieved, it would be most (7) . But some have raised concerns about genetically engineered crops. In nature, genetic diversity is created within certain (8) . A rose can be crossed with a different kind of rose, but a rose will never cross with a potato. Genetic engineering, (9) usually involves taking genes from one species and inserting them into another (10) to transfer a desired characteristic. This could mean, for example, selecting a gene which leads to the production of a chemical with anti-freeze (11) from an artic fish, and inserting it into a potato or strawberry to make it frost-resistant. (12) , then, biotechnology allows humans to (13) the genetic walls that separate species. Like the green revolution, (14) some call the gene revolution contributes to the problem of genetic uniformity—some say even more so (15) geneticists can employ techniques such as cloning and (16) culture, processes that produce perfectly (17) copies. Concerns about the erosion of biodiversity, therefore, remain. Genetically altered plants, however, raise new (18) , such as the effects that they may have on us and the environment. "We are flying blindly into a new (19) of agricultural biotechnology with high hopes, few constraints, and little idea of the potential (20) ," said science writer Jeremy Rifkin.

单选题According to the speaker, "My Experiences in Washington" will deal with ______.

单选题It is believed that the government gets a (an) ______ from taxes and the profits from state-run business. A. income B. interest C. revenue D. premium

单选题 In some countries where racial prejudice is acute, violence has so come to be taken for granted as a means of solving differences, that it is not even questioned. There are countries where the white man imposes his rule by brute force; there are countries where the black man protests by setting fire to cities and by looting and pillaging. Important people on both sides, who would in other respects appear to be reasonable men, get up and calmly argue in favor of violence--as if it were a legitimate solution, like any other. What is really frightening, what really fills you with despair, is the realization that when it comes to the crunch, we have made no actual progress at all. We may wear collars and ties instead of war-paint, but our instinct remain basically unchanged. The whole of the recorded history of the human race, that tedious documentation of violence, has taught us absolutely nothing. We have still not learnt that violence never solves a problem but makes it more acute. The sheer horror, the bloodshed, the suffering means nothing. No solution ever comes to light the morning after when we dismally contemplate the smoking ruins and wonder what hit us. The truly reasonable men who know where the solutions lie are finding it harder and harder to get a hearing. They are despised, mistrusted and even persecuted by their own kind because they advocate such apparently outrageous things as law enforcement. If half the energy that goes into violent acts were put to good use, if our efforts were directed at cleaning up the slums and ghettos, at improving living-standards and providing education and employment for all, we would have gone a long way to arriving at a solution. Our strength is sapped by having to mop up the mess that violence leaves in its wake. In a well-directed effort, it would not be impossible to fulfill the ideals of a stable social program. The benefits that can be derived from constructive solutions are everywhere apparent in the world around us. Genuine and lasting solutions are always possible, providing we work within the framework of the law. Before we can even begin to contemplate peaceful co-existence between the races, we must appreciate each other's problems. And to do this, we must learn about them: it is a simple exercise in communication, in exchanging information. "Talk, talk, talk," the advocates of violence say, "all you ever do is talk, and we are none the wiser." It's rather like the story of the famous barrister who painstakingly explained his case to the judge. After listening to a lengthy argument the judge complained that after all this talk, he was none the wiser. "Possibly, my Lord," the barrister replied, "none the wiser, but surely far better informed." Knowledge is the necessary prerequisite to wisdom: the knowledge that violence creates the evils it pretends to solve.

单选题The government ______ regulations that put this old city under protection.

单选题Many people think there is no need to take special care over home security. "I'm all right, I'm insured." Maybe--if you're fully insured. Even then you can never recover the real value you place upon your possessions. But you can't insure against the upset and unhappiness that we all feel if our homes are seriously damaged by some stranger, our windows and doors smashed, our precious possessions ruined. "It won't happen to me." Won't it? A home is broken into almost every minute of the day. Thefts of all kinds, including cars and property stolen, happen twice as frequently. "I've nothing worth stealing." You may think not. But in fact every one has something worth a thief's attention. And we all have things of special value to us even if they're worth little or nothing in cash terms. "I'm only a tenant here." The thief doesn't care whether you're a tenant or an owner-occupier. You're just as likely to be robbed. Have a word with the owner of the house ff you think extra locks and fastenings are necessary. "They'll get in any way." Most thieves are always looking for easy jobs. They are soon discouraged by houses they can't get into quickly and easily. So it's worth taking care. This booklet will help you. It's based on the practical experience of police forces throughout the country. Most of the suggestions will cost you only a few minutes extra time and thought. A few may involve some expense, but this is small compared with the loss and unhappiness you might otherwise suffer. If you are in doubt, ask for free advice from the Crime Prevention Officer at your local police station.

单选题You are just the same ______ you were the day when I first met you. A. that B. as C. like D. so

单选题Doctor: It's the flu. Drink plenty of water and have a good rest. Patient : Do I have to stay in bed? I have piles of work to do at office. Doctor:______ A. Did you hear what I just said? B. You needn't go to the office. C. It' s OK if you have to work overtime. D. I' m afraid yon have to keep it off your mind for a week or so.

单选题Mathematics is still the necessary ______ for the management of nature.

单选题I hate people who ______the end of a film that you haven''t seen before.

单选题Without the radar receiver, the large antenna(无线) ______ of no use.

单选题{{B}} Directions: For each blank in the following passage, choose the best answer from the choices givenbelow. Mark your answer on the ANSWER SHEET by drawing with a pencil a short bar acrossthe corresponding letter in the brackets.{{/B}} Science textbooks and technical and professional journals are usually made up of several partsand contain various special features, many of which have a standard format. {{U}} 31 {{/U}}usually contain a large number of these parts; journals and{{U}} 32 {{/U}}contain many, butnot all of them. Knowing where to look for information and{{U}} 33 {{/U}}to expect in a book can greatly increase yourability to use all the information there. Explanations of and practice using some of these textbook partsand{{U}} 34 {{/U}}are covered in these even numbered lessons. The features in textbooks are{{U}} 35 {{/U}}into thefollowing three categories. Front matter is the{{U}} 36 {{/U}}-numeral paginated section at the front of mostBooks. The text is the main Body of the Book. The{{U}} 37 {{/U}}matter comprises the additional sections at theback of most books.{{U}} 38 {{/U}}our discussion of these three sections will deal mainly with textbooks, thepractice provided will greatly{{U}} 39 {{/U}}your comprehension of scientific{{U}} 40 {{/U}}as well.

单选题The weather condition will probably change from day to night in______.

单选题The finance minister has not been so ______ since he raised taxes to an unbearable level.