单选题The announcement of the death of their beloved leader caused thereafter a feeling of great despair to ______ their lives.

单选题One of the many theories about alcoholism is the learning and reinforcement theory, which explains alcoholism by considering alcohol drinking as a reflex response to some stimulus and as a way to reduce an inner drive state such as fear or anxiety. Characterizing life situations in terms of approach and avoidance, this theory holds that persons tend to be drawn to pleasant situations or repelled by unclean, sanity ones. In the latter case, alcohol drinking is said to reduce the tension or feelings of unpleasantness and to replace them with the feeling of pleasure generally observed in most persons after they have consumed one or more drinks. Some experimental evidence tends to show that alcohol reduces fear in an approach-avoidance situation. Conger trained one group of rats to approach a food goal and trained another group to avoid electric shock. After an injection of alcohol the pull away from the shock was measurably weaker, while the pull toward food was unchanged. The obvious troubles experienced by alcoholic persons appear to contradict the learning theory in the explanation of alcoholism. The discomfort, pain, and punishment they experience should presumably discourage the alcoholics from drinking. The fact that alcoholic persons continue to drink in the face of family discord, loss of job, and illness is explained by the proximity of the drive of reduction to the consumption of alcohol; that is, alcohol has the immediate effect of reducing tension while the unpleasant consequences of drunken behavior came only later. The learning pattern, therefore, favors the establishment and repetition of the resort to alcohol. In fact, the anxieties and feelings of guilt caused by the consequences of excessive alcohol drinking may themselves become the signal for another time of alcohol abuse. The way in which the desire for another drink could be caused by anxiety is explained by the process of stimulus generalization: conditions or events securing at the time of reinforcement tend to acquire all the features of stimuli. When alcohol is consumed in association with a state of anxiety or leer, the emotional state itself takes on the properties of a stimulus, thus triggering another time of drinking. The role of punishment is becoming increasingly important in explaining a cause of alcoholism based on the principles of learning theory. While punishment may serve to suppress a response, experiments have shown that in some cases it can serve as a reward and reinforce the behavior. Thus if the alcoholic person has learned to drink under conditions of both reward and punishment, either type of condition may trigger renewed drinking.

单选题Why did the Post lose much of its audience in the 1930's? 

单选题 —I prefer shutting myself in and listening to music all day on Sundays. —That's ______ I don't agree. You should have a more active life.

单选题I think Kim would be great for the job. Her work record is ______.

单选题 How Much Can an Extra Hour's Sleep Change You? A. The average Briton gets six-and-a-half hours' sleep a night, according to the Sleep Council. Michael Mosley took part in an unusual experiment to see if this is enough. It has been known for some time that the amount of sleep people get has, on average, declined over the years. This has happened for a whole range of reasons, not least because we live in a culture where people are encouraged to think of sleep as a luxury—something you can easily cut back on. After all, that's what caffeine is for—to jolt you back into life. But while the average amount of sleep we are getting has fallen, rates of obesity and diabetes have soared. Could the two be connected? B. We wanted to see what the effect would be of increasing average sleep by just one hour. So we asked seven volunteers, who normally sleep anywhere between six and nine hours, to be studied at the University of Surrey's Sleep Research Centre. The volunteers were randomly allocated to two groups. One group was asked to sleep for six-and-a-half hours a night, the other got seven-and-a-half hours. After a week the researchers took blood tests and the volunteers were asked to switch sleep patterns. The group that had been sleeping six-and-a-half hours got an extra hour, the other group slept an hour less. C. While we were waiting to see what effect this would have, I went to the John Radcliffe Hospital in Oxford to learn more about what actually happens when we sleep. In the Sleep Centre, they fitted me up with a portable electro-encephalograph, a device that measures brain wave activity. Then, feeling slightly ridiculous, I went home and had my seven-and-a-half hours of sleep. D. The following day ! went to discuss what had happened inside my head during the night with Dr. Katharina Wulff. The first thing she pointed out was that I had very rapidly fallen into a state of deep sleep. Deep sleep sounds restful, but during it our brains are actually working hard. One of the main things the brain is doing is moving memories from short-term storage into long-term storage, allowing us more short-term memory space for the next day. If you don't get adequate deep sleep then these memories will be lost. E. You might think: 'I'll cut back during the week and then make up for it at the weekend.' Unfortunately it doesn't work like that, because memories need to be consolidated within 24 hours of being formed. Since deep sleep is so important for consolidating memories it is a good idea if you are revising or perhaps taking an exam to make sure that you're getting a reasonable night's sleep. In one study, people who failed to do so did 40% worse than their contemporaries. Deep sleep only lasts for a few hours. F. My electrode results showed that during the night my brain went through multiple phases of another kind of activity, called REM sleep. 'This is the phase when you are usually paralyzed—so you can't move,' Wulff explained. 'But the eye muscles are not paralyzed, and that's why it's called rapid eye movement sleep.' During REM sleep an extraordinary thing happens. One of the stress-related chemicals in the brain, noradrenalin, is switched off. It's the only time, day or night, this happens. It allows us to remain calm while our brains reprocess all the experiences of the day, helping us come to terms with particularly emotional events. We get more REM sleep in the last half of the night. Which means that if you are woken unexpectedly, your brain may not have dealt with all your emotions—which could leave you stressed and anxious. Drinking alcohol late at night is not a good idea as it reduces your REM sleep while it's being processed in your body. G. Back at the University of Surrey our sleep volunteers had finished their second week of the experiment. What we wanted to see was the effect switching from six-and-a-half hours to seven-and-a-half hours, or vice versa, would have on our volunteers. H. Computer tests revealed that most of them struggled with mental agility tasks when they had less sleep, but the most interesting results came from the blood tests that were run. Dr. Simon Archer and his team at Surrey University were particularly interested in looking at the genes that were switched on or off in our volunteers by changes in the amount that we had made them sleep. 'We found that overall there were around 500 genes that were affected,' Archer explained. 'Some which were going up, and some which were going down.' What they discovered is that when the volunteers cut back from seven-and-a-half to six-and-a-half hours' sleep a night, genes that are associated with processes like inflammation, immune response and response to stress became more active. The team also saw increases in the activity of genes associated with diabetes and risk of cancer. The reverse happened when the volunteers added an hour of sleep. I. So the clear message from this experiment was that if you are getting less than seven hours' sleep a night and can alter your sleep habits, even just a little bit, it could make you healthier. 'Have a lie-in, it will do you good'—that's the kind of health message that doesn't come along very often.

单选题 The quality of patience goes a long way toward your goal of creating a more peaceful and loving self. The more patient you are, the more accepting you will be of what life is, rather than insisting that life be exactly as you would like it to be. Without patience, life is extremely frustrating. You are easily annoyed, bothered, and irritated. Patience adds a dimension of ease and acceptance to your life. It's essential for inner peace. Becoming more patient involves opening your heart to the present moment, even if you don't like it. If you are stuck in a traffic jam, late for an appointment, being patient would mean keeping yourself from building a mental snowball before your thinking get out of hand and gently reminding yourself to relax. It might also be a good time to breathe as well as an opportunity to remind yourself that, in the bigger scheme of things, being late is 'small stuff'. Patience is a quality of heart that can be greatly enhanced with deliberate practice. An effective way that I have found to deepen my own patience is to create actual practice periods—periods of time that I set up in my mind to practice the art of patience. Life itself becomes a classroom, and the curriculum is patience. You can start with as little as five minutes and build up your capacity for patience over time. What you'll discover is truly amazing. Your intention to be patient, especially if you know it's only for a short while, immediately strengthens your capacity for patience. Patience is one of those special qualities where success feeds on itself. Once you reach little milestone (里程碑)—five minutes of successful patience—you'll begin to see that you do indeed have the capacity to be patient, even for longer periods of time. Over time, you may even become a patient person. Being patient will help you to keep your perspective. You'll see even a difficult situation, say your present challenge, isn't 'life or death' but simply a minor obstacle that must be dealt with. Without patience, the same scenario can become a major emergency complete with yelling, frustration, hurt feelings, and high blood pressure.

单选题M: I hear the students gave the new teacher an unfair evaluation. W: It depends on which student you are talking about.Q: What does the woman imply?

单选题The word "nomadic" in the sentence "How is this affected by whether a bird is nomadic.?" can best probably mean ______.

单选题Such questions should be approached honestly and in full awareness that______loan agreements will cost money due to cancellation or other charges.

单选题 He is a brilliant scholar and is everywhere recognized ______.

单选题--Nice to see you. I ______ you for a long time. --I ______ in Berlin. I've just got back. A. didn't see, am B. wasn't seeing, am C. hadn't see, have been D. haven't seen, was

单选题 Blood vessels running all through the lungs carry blood to each air sac (囊), or alveolus(肺泡), and then back again to the heart. Only the thin wall of the air sac and the thin wall of a capillary (毛细血管) are between the air and the blood. So oxygen easily diffuses from the air sacs through the walls into the blood, while carbon dioxide easily diffuses from the blood through the walls into the air sacs. When blood is sent to the lungs by the heart, it has come back from the cells in the rest of the body. So the blood that goes into the wall of an air sac contains much dissolved carbon dioxide but very little oxygen. At the same time, the air that goes into the air sac contains much oxygen but very little carbon dioxide. You have learned that dissolved materials always diffuse from where there is more of them to where there is less. Oxygen from the air dissolves in the moisture on the lining of the air sac and diffuses through the lining into the blood. Meanwhile, carbon dioxide diffuses from the blood into the air sac. The blood then flows from the lungs back to the heart, which sends it out to all other parts of the body. Soon after air goes into an air sac, it gives up some of its oxygen and takes in some carbon dioxide from the blood. To keep diffusion going as it should, this carbon dioxide must be gotten rid of. Breathing, which is caused by movements of the chest, forces the used air out of the air sacs in your lungs and brings in fresh air. The breathing muscles are controlled automatically so that you breathe at the proper rate to keep your air sacs supplied with fresh air. Ordinarily, you breathe about twenty-two times a minute. Of course, you breathe faster when you are exercising and slower when you are resting. Fresh air is brought into your lungs when you breathe in, or inhale(吸入), while used air is forced out of your lungs when you breathe out, or exhale. Some people think that all the oxygen is taken out of the air in the lungs and that what we breathe out is pure carbon dioxide. But these ideas are not correct. Air is a mixture of gases that is mostly nitrogen (氮). This gas is not used in the body. So the amount of nitrogen does not change as air is breathed in and out. But while air is in the lungs, it is changed in three ways: (1) About one-fifth of the oxygen in the air goes into the blood. (2) An almost equal amount of carbon dioxide comes out of the blood into the air. (3) Moisture from the linings of the air passages and air sacs evaporates until the air is almost saturated.

单选题The same factors push wages and prices up together, the one ______ the other. A. emphasizing B. reinforcing C. multiplying D. increasing

单选题Most people think of lions as strictly African beasts, but only because they"re been killed off almost everywhere else. Ten thousand years ago lions spanned vast sections of the globe. Now lions hold only a small fraction of their former habitat, and Asiatic lions, a subspecies that split from African lions perhaps 100,000 years ago, hang on to an almost impossibly small slice of their former territory. India is the proud steward of these 300 or so lions, which live primarily in a 560-square-mile sanctuary (保护区). It took me a year and a half to get a permit to explore the entire Gir Forest—and no time at all to see why these lions became symbols of royalty and greatness. A tiger will hide in the forest unseen, but a lion stands its ground, curious and unafraid—lionhearted. Though they told me in subtle ways when I got too close, Gir"s lions allowed me unique glimpses into their lives during my three months in the forest. It"s odd to think that they are threatened by extinction; Gir has as many lions as it can hold—too many, in fact. With territory in short supply, lions move about near the boundary of the forest and even leave it altogether, often clashing with people. That"s one reason India is creating a second sanctuary. There are other pressing reasons: outbreaks of disease or natural disasters. In 1994 a serious disease killed more than a third of Africa"s Serengeti lions—a thousand animals—a fate that could easily happen to Gir"s cats. These lions are especially vulnerable to disease because they descend from as few as a dozen individuals. "If you do a DNA test, Asiatic lions actually look like identical twins," says Stephen O"Brien, a geneticist (基因学家) who has studied them. Yet the dangers are hidden, and you wouldn"t suspect them by watching these lords of the forest. The lions display vitality, and no small measure of charm. Though the gentle intimacy of play vanishes when it"s time to eat, meals in Gir are not necessarily frantic affairs. For a mother and her baby lion sharing a deer, or a young male eating an antelope (羚羊), there"s no need to fight for a cut of the kill. The animals they hunt for food are generally smaller in Gir than those in Africa, and hunting groups tend to be smaller as well.

单选题When we were in the mountains, we often found ourselves entirely enveloped by the fog.

单选题Many countries have conservation programs to prevent certain ______ of fish from becoming extinct.

单选题In paragraph 3 the writer uses the phrase "to the best of my knowledge..." because ______.

单选题The information used by the computer to make its detailed maps ______. Ⅰ. was gathered by the Defense Department and the U. S. Geological Survey Ⅱ. shows points roughly 200 feet apart Ⅲ. involves altitude measurements