题目
题型：不详难度：来源：
So far as the brain is concerned, it can work as well and swiftly at the end of eight or even twelve hours f efforts as at the beginning. The brain is totally tireless. So what makes us tired.
Some scientists declare that most of our fatigue come from our mental and emotional(情感的) attitudes. One of England’s most outstanding scientists. J. A. Hadfield,says,“The greater part of the fatigue from which we suffer is of mental origin. In fact,fatigue of purely physical origin is rare.” Dr. Brill, a famous American scientist, goes even further. He declares,“One hundred percent of the fatigue of a sitting worker in good health is due to emotional problems.”
What kinds of emotions make sitting workers tired?Joy?Satifaction?No!A feeling of being bored,anger,anxiety,tenseness,worry,a feeling of nt being appreciated---those are emotions that tire sitting workers.Hard work by itself seldom causes fatigue.We get tired because our emotions produce nervousness in the body.
小题1:What surprised the scientists a few years ago?
| A．Fatigue toxinscould hardly be found in a labour’s blood. |
| B．Albert Eistein didn’t feel worn out after a day’s work. |
| C．The brain could wrk for many hours without fatigue. |
| D．A mental worker’s blood was filled with fatigue toxins. |
| A．Challenge mental work. |
| B．Unpleasant emotions. |
| C．Endless tasks. |
| D．Physical labor. |
| A．He agrees with them. |
| B．He doubts them |
| C．He argues against them. |
| D．He hesitates to accept them. |
| A．have some good blood |
| B．enjoy their work |
| C．exercise regularly |
| D．discover fatigue toxin |
答案
小题1:C
小题2:B
小题3:A
小题4:B
解析
【文章大意】本文是科普说明文。通过实验来证明什么让人们感到疲劳的。
小题1:根据文章的第一段中To the amazement of these scientists, they discovered thett blood passing through the brain, when it is active, shows no fatigue at all!进行理解。
小题2:根据文章的最后一段的第二句话进行判断。
小题3:根据文章的第一段第一句话和最后一段推断作者是科学家的观点的。
小题4:根据文章的最后一句话判断推理。
核心考点
试题【Here is an astonishing and signficant fact:Mental work alone can’t make us tired】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
As a result, songs sound like noise to an amusic. Many amusics compare the sound of music to pieces of metal hitting each other. Life can be hard for amusics. Their inability to enjoy music set them apart from others. It can be difficult for other people to identify with their condition. In fact, most people cannot begin to grasp what it feels like to be amusic. Just going to a restaurant or a shopping mall can be uncomfortable or even painful. That is why many amusics intentionally stay away from places where there is music. However, this can result in withdrawal and social isolation. “I used to hate parties,” says Margaret, a seventy-year-old woman who only recently discovered that she was amusic. By studying people like Margaret, scientists are finally learning how to identify this unusual condition.
Scientists say that the brains of amusics are different from the brains of people who can appreciate music. The difference is complex, and it doesn’t involve defective hearing. Amusics can understand other nonmusical sounds well. They also have no problems understanding ordinary speech. Scientists compare amusics to people who just can’t see certain colors.
Many amusics are happy when their condition is finally diagnosed (诊断). For years, Margaret felt embarrassed about her problem with music. Now she knows that she is not alone. There is a name for her condition. That makes it easier for her to explain. “When people invite me to a concert, I just say, ‘No thanks, I’m amusic,’” says Margaret. “I just wish I had learned to say that when I was seventeen and not seventy.” (335 words)
小题1:Which of the following is true of amusics?
| A．Listening to music is far from enjoyable for them. |
| B．They love places where they are likely to hear music. |
| C．They can easily tell two different songs apart. |
| D．Their situation is well understood by musicians. |
| A．dislikes listening to speeches |
| B．can hear anything nonmusical |
| C．has a hearing problem |
| D．lacks a complex hearing system |
| A．her problem with music had been diagnosed earlier |
| B．she were seventeen years old rather than seventy |
| C．her problem could be easily explained |
| D．she were able to meet other amusics |
| A．Amusics’ strange behaviours. |
| B．Some people’s inability to enjoy music. |
| C．Musical talent and brain structure. |
| D．Identification and treatment of amusics. |
(268 words)
小题1:According to Warranty Limitations, a product can be under warranty if __________.
A. shipped from a Canadian factory B. rented for home use
C. repaired by the user himself D. used in the U.S.A.
小题2:According to Owner’s Responsibilities, an owner has to pay for __________.
| A．the loss of the sales receipt | B．a servicer’s overtime work |
| C．the product installation | D．a mechanic’s transportation |
| A．Consequential damages are excluded across America. |
| B．A product damaged in a natural disaster is covered by the warranty. |
| C．A faulty cabinet due to rust can be replaced free in the second year. |
| D．Free repair is available for a product used improperly in the first year. |
“It’s extremely important for us to think about this as a whole system and not just the sum of a bunch of individual components (元件),” said Robert Wood, the Harvard engineering professor who has been working on the robotic fly project for over a decade. A few years ago, his team got the go-ahead to start piecing together the components. “The added difficulty with a project like this is that actually none of those components are off the shelf and so we have to develop them all on our own,” he said.
They engineered a series of systems to start and drive the robotic fly. “The seemingly simple system which just moves the wings has a number of interdependencies on the individual components, each of which individually has to perform well, but then has to be matched well to everything it’s connected to,” said Wood. The flight device was built into a set of power, computation, sensing and control systems. Wood says the success of the project proves that the flying robot with these tiny components can be built and manufactured.
While this first robotic flyer is linked to a small, off-board power source, the goal is eventually to equip it with a built-in power source, so that it might someday perform data-gathering work at rescue sites, in farmers’ fields or on the battlefield. “Basically it should be able to take off, land and fly around,” he said.
Wood says the design offers a new way to study flight mechanics and control at insect-scale. Yet, the power, sensing and computation technologies on board could have much broader applications. “You can start thinking about using them to answer open scientific questions, you know, to study biology in ways that would be difficult with the animals, but using these robots instead,” he said. “So there are a lot of technologies and open interesting scientific questions that are really what drives us on a day to day basis.”
(392 words)
小题1:The difficulty the team of engineers met with while making the robotic fly was that __________.
| A．they had no model in their mind |
| B．they did not have sufficient time |
| C．they had no ready-made components |
| D．they could not assemble the components |
| A．consists of a flight device and a control system |
| B．can just fly in limited areas at the present time |
| C．can collect information from many sources |
| D．has been put into wide application |
| A．The robotic flyer is designed to learn about insects. |
| B．Animals are not allowed in biological experiments. |
| C．There used to be few ways to study how insects fly. |
| D．Wood’s design can replace animals in some experiments. |
| A．Father of Robotic Fly |
| B．Inspiration from Engineering Science |
| C．Robotic Fly Imitates Real Life Insect |
| D．Harvard Breaks Through in Insect Study |
Tests on healthy volunteers found that they were more likely to feel a sense of fear at the moment when their hearts are contracting(收缩) and pumping blood around their bodies, compared with the point when the heartbeat is relaxed. Scientists say the results suggest that the heart is able to influence how the brain responds to a fearful event, depending on which point it is at in its regular cycle of contraction and relaxation.
Sarah Garfinkel at the Brighton and Sussex Medical School said: "Our study shows for the first time that the way in which we deal with fear is different depending on when we see fearful pictures in relation to our heart."
The study tested 20 healthy volunteers on their reactions to fear as they were shown pictures of fearful faces. Dr Garfinkel said, "The study showed that fearful faces are better noticed when the heart is pumping than when it is relaxed. Thus our hearts can also affect what we see and what we don"t see - and guide whether we see fear."
To further understand this relationship, the scientists also used a brain scanner(扫描仪) to show how the brain influences the way the heart changes a person"s feeling of fear. “We have found an important mechanism by which the heart and brain ‘speak’to each other to change our feelings and reduce fear," Dr Garfinkel said.
"We hope that by increasing our understanding about how fear is dealt with and ways that it could be reduced, we may be able to develop more successful treatments for anxiety disorders, and also for those for those who may be suffering from serious stress disorder."
小题1:What is the finding of the study?
| A．One"s heart affects how he feels fear. |
| B．fear is a result of one"s relaxed heartbeat. |
| C．fear has something to do with one"s health. |
| D．Ones fast heartbeats are likely to cause fear. |
| A．volunteers" heartbeats when they saw terrible pictures |
| B．the time volunteers saw fearful pictures and their health conditions |
| C．volunteers" reactions to horrible pictures and data from their brain scans |
| D．different pictures shown to volunteers and their heart-brain communication |
| A．Order. | B．system. | C．machine. | D．treatment. |
| A．treating anxiety and stress better |
| B．explaining the cycle of fear and anxiety |
| C．finding the sky to the heart-brain communication |
| D．understanding different fears in our hearts and heads |
The oldest known transport wheel was discovered in 2002 in Slovenia. It is over 5,100 years old. Evidence suggests that wheels for transport didn’t become popular for a while, though. This could be because animals did a perfectly good job of carrying farming tools and humans around.
But it could also be because of a difficult situation. While wheels need to roll on smooth surfaces, roads with smooth surfaces weren’t going to be constructed until there was plenty of demand for them. Eventually, road surfaces did become smoother, but this difficult situation appeared again a few centuries later. There had been no important changes in wheel and vehicle design before the arrival of modem road design.
In the mid-1700s, a Frenchman came up with a new design of road—a base layer (层) of large stones covered with a thin layer of smaller stones. A Scotsman improved on this design in the 1820s and a strong, lasting road surface became a reality. At around the same lime, metal hubs (the central part of a wheel) came into being, followed by the pneumatic tyre(充气轮胎) in 1846. Alloy wheels were invented in 1967, sixty years after the appearance of tarmacked roads (柏油路). As wheel design took off, vehicles got faster and faster.
小题1:What might explain why transport wheels didn’t become popular for some time?
| A．Few knew how to use transport wheels. |
| B．Humans carried farming tools just as well. |
| C．Animals were a good means of transport. |
| D．The existence of transport wheels was not known. |
| A．It was easier than wheel design. |
| B．It improved after big changes in vehicle design. |
| C．It was promoted by fast-moving vehicles. |
| D．It provided conditions for wheel design to develop. |
| A．By giving examples. |
| B．By making comparisons. |
| C．By following time order. |
| D．By making classifications. |
| A．The beginning of road design. |
| B．The development of transport wheels. |
| C．The history of public transport. |
| D．The invention of fast-moving vehicles. |
最新试题
- 1“a＜b”是“ac2＜bc2”的（ ）A．必要不充分条件B．充分不必要条件C．充分必要条件D．既不充分也不必要条件
- 2许多教育家强调指出，在21世纪，合作的意识与能力是人的重要素质，而未来社会竞争将更加激烈，如何协调合作与竞争的关系非常迫
- 3下列关于金属腐蚀正确的是[ ]A．金属在潮湿的空气中腐蚀的实质是：M+nH2O==M(OH)n+n/2H2↑ B
- 4已知抛物线y=x2-2x-3，若点P（-2，5）与点Q关于该抛物线的对称轴对称，则点Q的坐标是（ ）。
- 5下列各项中字形不合规范的一项是（ ）A．飞来横祸不揣冒昧间不容发B．万马齐暗雄关险隘溘然长逝C．层见叠出怏怏不乐强词夺理
- 6按图所示的实物图画出它的电路图．
- 7下列对实验现象的描述正确的是（ ）A．点燃蜡烛时，火焰分三层，焰心最亮B．家用铝锅是黑色的C．蜡烛燃烧生成水和二氧化碳
- 8翻译下列课文中的句子。（8分）（1）养生丧死无憾，王道之始也。（2分）译文：
- 9已知点P（tanα，cosα）在第三象限，则角α是（ ）A．第一象限角B．第二象限角C．第三象限角D．第四象限角
- 10“往事像落日映照的河面，我拣闪光的珍藏在心中。”在行将结束三年初中学习和生活的时刻，让我们共同回忆那难以忘怀的岁月，感念
热门考点
- 1父母的性状是通过他们的________遗传给子女的，在染色体上的遗传物质中有决定生物性状的小单位，叫做________。
- 2若（1﹣m）2与|n+2|互为相反数，则m﹣n=（ ）。
- 3She ______ to avoid doing anything dishonest.A．resistedB．det
- 42010年10月至2011年9月，中意两国政府在意大利举办了“中国文化年”，这是两国文化交流的一件大事，也是双方推进务实
- 5下列物质的用途利用了其化学性质的是 [ ]A．CO2用作温室气体肥料 B．活性炭能除去冰箱中的异味
- 6铁是一种应用广泛的金属。下列有关铁的叙述正确的是( )A．从历史上看，人类利用最早的金属是铁器B．铁与盐酸反应可
- 7如图是在牛顿著作里画出的一副原理图。图中表示出从高山上用不同的水平速度抛出的物体的轨迹。物体的速度越大，落地点离山脚越远
- 8有人对某旅游区的旅游人数进行了10天统计，结果有3天是每天800人，有2天是每天1200人，有5天是每天700人，那么这
- 9读下表，完成下列各题。小题1:从表中可以看出地球与火星( )A．质量相近B．体积接近C．自转周期相近 D．公转周期最
- 10“一战”前后，帝国主义国家之间主要矛盾的变化是A．由英德矛盾到英日矛盾B．由英德矛盾到英法矛盾C．由英德矛盾到英美矛盾D