单选题Long-term use of the drug can the patient's personality. A. alter B. switch C. exchange D. substitute

单选题Do you think sitting and studying all the time will improve your grades? Think again. Getting some exercise may help, too. New research with older people suggests that taking regular walks helps them pay attention better than if they didn"t exercise. Previous research had shown that mice learn, remember, and pay attention better after a few weeks of working out on a running wheel. Mice that exercise have greater blood flow to the brain than those who don"t. Their brain cells also make more connections. Neuroscientists from the University at Urbana-Champaign wanted to find out if the same thing is true for people. First, they measured the physical fitness of 41 adults, ages 58 to 77, after each person walked 1 mile. Then, participants looked at arrows on a computer screen and had to use computer keys to show which way one particular arrow was pointing. Adults who were physically fit were faster at the arrow task, and their answers were just as accurate as their less-fit peers, the researchers found. The fitter participants also had more blood flow to a part of their brain responsible for paying attention and making decisions. In a second study, 15 elderly people who completed a 6-month aerobic-training course were faster at attention tasks compared with 14 seniors who just did stretching and toning exercises for the same amount of time. So, even going for a walk every 2 or 3 days for just 10 to 45 minutes can help. That should be good news for your grandparents. The effects of exercising on the brains of younger people haven"t been studied yet. Still, it can"t hurt to take occasional study breaks and go for a walk or run around with your friends. You might even do better in school. Whatever you do, though, don"t try to read and walk at the same time. You could end up hurting yourself!

单选题I criticized him, you know, not ______ I hate him but ____ I love him.A. because; becauseB. because; forC. for; becauseD. for; for

单选题As welfare reform has ______ millions of single mothers like Patino into the workforce since 1996, questions about its effects on families have loomed large. A. nudged B. propelled C. divested D. bumped

单选题If you ______ that late movie last night，you wouldn't be sleepy. A. haven't watched B. hadn't watched C. didn't watch D. wouldn't have watched

单选题Lily has no trouble finding the new railway station because she has a good ______ of direction.

单选题Social scientists believe that societies with a_______ of young men without hope of marriage suffer from instability, violence and surges in crime.

单选题The reason why he adapted to the new situations quickly is that he has a ______ attitude.

单选题d ie

单选题 Passage 4 In recent years, many Americans of both sexes and various ages have become interested in improving their bodies. They have become devoted to physical fitness. The need to exercise has almost become compulsive with many persons who have a strong desire to be more physically fit. By nature, Americans are enthusiastic and energetic about their hobbies and pastimes. They apply this enthusiasm, and energy to jogging/running. As a result, there are running clubs to join and many books and magazines to read about running. The desire to be physically fit is explained by a "passion" for good health. The high rate of heart attacks in the 1960s caused an increase on the part of the public in improving the human body. Middle-aged men especially suffer from heart attacks. Thus, they are one group strongly interested in more physical exercise. In fact, many doctors encourage their patients to become more physically active, especially those who have sedentary jobs. It is interesting to note that the rate of heart attacks began to decrease in the 1970s and it is still decreasing. Physical fitness currently enjoys a favored role in the United States. It is a new "love" that many Americans have cherished. Will it last long? Only time will tell or until another "new passion" comes along.

单选题Her description of the garden made me ______ it.

单选题What does the author mean by "marginal candidates"?

单选题He was told under no circumstances ______ the computer. A) he may use B) he use may C) may he use D) may use

单选题In which of the following cases is it useful to consider the relationship between the length of an oscillating object and its natural period?

单选题______children have been taken out of school and taught by their parents at home.

单选题{{B}}Directions: There are five reading passages in this part. Each passage is followed by four questions. For each question there are four suggested answers marked A, B, C and D. Choose the best answer and blacken the corresponding letter on the Answer Sheet.{{/B}}{{B}}Passage One{{/B}} A man once said how useless it was to put advertisements in the newspapers. "Last week," said he, "my umbrella was stolen from a London Church. As it was a present, I spent twice its worth in advertising, but didn't get it back." "How did you write your advertisement?" asked one of the listeners, a merchant. "Here it is," said the man, taking out of his pocket a slip cut from a newspaper. The other man took it and read, "Lost from the City Church last Sunday evening, a black silk umbrella. The gentleman who finds it will receive ten shillings on leaving it at No. 10 Broad Street. " "Now," said the merchant, "I often advertise, and find that it pays me well. But the way in which an advertisement is expressed is of great importance. Let us try for your umbrella again, and if it fails, I'll buy you a new one." The merchant then took a slip of paper out of his pocket and wrote: "If the man who was seen to take an umbrella from the City Church last Sunday evening doesn't wish to get into trouble, he will return the umbrella to No. 10 Broad Street. He is well known." This appeared in the paper, and on the following morning, the man was astonished when he opened the front door. In the doorway lay at least twelve umbrellas of all sizes and colors that had been thrown in, and his own was among the number. Many of them had notes, fastened to them saying that they had been taken by mistake, and begging the loser not to say anything about the matter.

单选题The last guests to reach the hotel______ at 12 o' clock at night. A. checked out B. checked up C. checked in D. checked on

单选题{{B}}Passage Three{{/B}} Traditionally, the study of history has had fixed boundaries and focal points—perious, countries, dramatic events, and great leaders. It has also had clear and firm notions of scholarly procedure: how one inquires into a historical problem, how one presents and documents one's findings, what constitutes admissible and adequate proof. Anyone who has followed recent historical literature, can testify to the revolution that is taking place in historical studies. The currently fashionable subjetcs come directly from the sociology catalog: childhood, work, leisure. The new subjects are accompanied by new methods. Where history once was primarily narrative, it is now entirely analytic. The old questions "What happened?" and "How did it happen?" have given way to the question "Why did it happen?" Prominent among the methods used to answer the question "Why" is psychoanalysis, and its use has given rise to psychohistory. Psychohistory does not merely use psychological explanations in historical context. Historians have always used such explanations when they were appropriate and when there was sufficient evidence for them. But this practical use of psychology is not what psychohistorians intend. They are committed not just to psychology in general, but to Frendian psychoanalysis. This commitment precludes a commitment history as historians have always understood it. Psychohistory derives its "facts" not from history, the detailed records of events and their consequences, but from psychoanalysis of the individuals who made history, and deduces its theories not from this or that instance in their lives, but from a view of human nature that transcends history. It denies the basic criterion of historical evidence that evidence be publicly accessible to, and therefore assessable by, all historians. And it violates the basic tenet of historical method: that historians be alert to the negative instances that would refute their rightness of their theses. Psychohisotrians, convinced of the absolute rightness of their own theories, are also convinced that theirs is the "deepest" explanation of any event, that other explanations fall short of the truth. Psychohistory is not content to violate the discipline of history (in the sense of the proper mode of studying and writing about the past); ii also violates the past itself. It denies to the past an integrity and will of its own, in which people acted out of a variety of motives and in which events had a multiplicity of causes and effects. It imposes upon the past the same determinism that it imposes upon the present, thus robbing people and events of their individuality and of their complexity, Instead of respecting the particularity of the past, it assimilates all events, past and present, into a single deterministic schema that is presumed to be true at all times and in all circum stances.

单选题There was ______ time ______ I hated to go to school. A. a, that B. a, when C. the, that D. the, when

单选题Denim ______.