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High firing pressures and a low exhaust temperature in a diesel engine may result from （）.
A . decreased piston to cylinder head clearance
B . increased exhaust system back pressure
C . early fuel injection timing
D . low scavenge air temperature
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In a compression refrigeration plant the refrigerant is under low pressure in the （） and under high pressure in the （）.
A . compressor；condenser
B . condenser；evaporator
C . throttle valve；evaporator
D . evaporator；condenser
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When navigating in high latitudes and using a chart based on a Lambert conformal projection，（）.
A、a straight line drawn on the chart approximates a great circle
B、the chart should not be used outside of the standard parallels
C、the course angle is measured at the mid-longitude of the track line
D、Distance cannot be measured directly from the chart
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But in schools science is often presented in a dry and uninteresting
manner.
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Politically these nations tend to be ________， with very high birth rates but poor education and very low levels of literacy.
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But in schools science is often presented in a dry and uninteresting manner.
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A stressed word is read very clearly and strongly in a high voice.
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A person of integrity not only sets high moral and ethical standards but also（ ）.
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In the United States, the managers carry a high status and they are cultural hero.
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_____ style focuses on the speaker and role relationships. People with such communication style stress high power distance. This style is popular in collectivist and high-context culture.
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But in recent years, many older people ______by the banks to invest their savings in high-yielding money-market accounts.
A．have persuaded
B．are persuading
C．have been persuaded
D．being persuaded
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In most high schools, boys and girls attend the same classes, except in health education,- where they are segregated.
A．classified
B．organized
C．decomposed
D．separated
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Some species of birds are highly sociable and nest in dense colonies.
A．hardly
B．seasonably
C．extremely
D．chiefly
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It's high time that he settled down in the country and （） a new life.
It&39;s high time that he settled down in the country and （） a new life.
A．starting
B．started
C．start
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Peanuts are very highly nutritious and are also high in protein（）. In India, where the poor can’t pay for meat or milk, peanuts meal and peanuts milk have been produced. These have been a great help to the poor.
A．味美的
B．有营养的
C．味同嚼蜡的
D．有毒的
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Under pressure from animal welfare groups, two national science teachers associations have adopted guidelines that ban classroom experiments harming animals. The National Association of Biology Teachers and the National Science Teachers Association hope to end animal abuse in elementary and secondary schools and, in turn, discourage students from mishandling animals in home experiments and science fair projects.
Animal welfare groups are apparently most concerned with high school students experimenting with animals in extracurricular projects. Barbara Orlans, President of the Scientists' Center for Animal Welfare, said that students have been performing surgery at random, testing known poisonous substances, and running other pathology experiments on animals without even knowing normal physiology.
At one science fair, a student cut off the leg and tail of a lizard to demonstrate that only the tail can regenerate, she said. In another case, a student bound sparrows, starved them and observed their behavior.
"The amount of abuse has been quite horrifying", Orlans said.
Administrators of major science fairs are short-tempered over the teachers' policy change and the impression it has created. "The teachers were sold a bill of goods by Barbara Orlans", said Thurman Grafton, who heads the rules committee for the International Science and Engineering Fair. "Backyard tabletop surgery is just nonsense. The new policies throw cold water on students' inquisitiveness", he said.
Grafton said he wouldn't deny that there hasn't been animal abuse among projects at the international fair, but he added that judges reject contestants who have unnecessarily injured animals. The judges have a hard time monitoring local and regional fairs that may or may not choose to comply with the international fair's rules that stress proper care of animals, Grafton said.
He said that several years ago, the Westinghouse Science Talent Search banned harmful experiments to animals when sponsors threatened to cancel their support after animal welfare groups lobbied for change.
The teachers adopted the new policies also to fend off proposed legislation—in states including Missouri and New York—that would restrict or prohibit experiments on animals.
Officials of the two teachers organizations say that they don't know how many animals have been abused in the classroom. On the one hand, many biology teachers are not trained in the proper care of animals, said Wayne Moyer, executive director of the biology teachers' association. On the other, the use of animals in experiments has dropped in recent years because of school budget cuts. The association may set up seminars to teach better animal care to its members.
Notes:
pathology 病理学。lizard 蜥蜴。tabletop 桌面。short-tempered 脾气急躁的。lobby for 游说支持。fend off 躲开。
The title which best expresses the content of the text is _____.
A．Science Teachers to Ban Testing Harmful to Animals.
B．Teachers' Policy Change in Experiment on Animals.
C．The New Policies of Banning Harmful Experiments to Animals.
D．The Importance of Prohibiting Harmful Experiments on Animals.
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The primary objective of Basic Econometrics is to provide an elementary but comprehensive introduction to the art and science of econometrics.
A．brief
B．precise
C．simplified
D．extensive
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听力原文：Certainly I can give you some example. Factory farming is very bad for the environment, but it makes factory farming companies very high profits; companies aren’t concerned about the destruction of the rain forest and they are often not concerned about the conditions their workers work in.
For questions 13-17, choose the person who is speaking.
Write one letter(A-H)next to the number of the recording.
Do not use any letter more than once.
After you have listened once, replay the recording.
A. manager of a fast food company
B. employee representative of a dairy company
C. personnel manager
D. farmer
E. lawyer
F. bank manager
G. journalist
H. manager of a farm
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Engineering students are supposed to be examples of practicality and rationality, but when it comes to my college education I am an idealist and a fool. In high school I wanted to be an electrical engineer and, of Course, any sensible student with my aims would have chosen a college with a large engineering department, famous reputation and lots of good labs and research equipment. But that's not what I did.
I chose to study engineering at a small liberal-arts university that doesn't even offer a major in electrical engineering. Obviously, this was not a practical choice; I came here for more noble reasons. I wanted a broad education that would provide me with flexibility and a value system to guide me in my career. I wanted to open my eyes and expand my vision by interacting with people who weren't studying science or engineering. My parents, teachers and other adults praised me for such a sensible choice. They told me I was wise and mature beyond my 18 years, and I believed them.
I headed off to college, feeling sure I was going to have an advantage over those students who went to big engineering "factories" where they didn't care if you had values or were flexible. I was going to be a complete engineer: technical genius and sensitive humanist all in one.
Now I'm not so sure. Somewhere along the way my noble ideals crashed into reality, as all noble ideals eventually do. After three years of struggling to balance math, physics and engineering courses with liberal arts courses, I have learned there are reasons why few engineering students try to reconcile engineering with liberal-arts courses in college.
The reality that has blocked my path to become the typical successful student is that engineering and the liberal arts simply don't mix as easily as I assumed in high school. Individually they shape a person in very different ways; together they threaten to confuse. The struggle to reconcile the two fields of study is difficult.
The author chose to study engineering at a small liberal-arts university because he ______.
A．intended to be a sensible student with noble ideals
B．wanted to be an example of practicality and rationality
C．intended to be a combination of engineer and humanist
D．wanted to coordinate engineering with liberal-arts courses in college
此题为多项选择题。
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Betty is from Italy. Now she lives in Edinburgh . But her parents still live in Italy. She is 25 years old. She is a teacher. She works in a high school in Edinburgh. She teaches science (科学) and she likes her work. Most of her students are 15 or 16 years old. They all like her. They think she is a great teacher and a beautiful girl with long golden hair. Betty has a boyfriend. His name is Ray. He is British. He is 30 years old. He likes books and music. He can play the piano very well. He is in IT. He works very hard. But he does not like his job. He likes traveling like Betty, and of course he likes staying with Betty.
(1). Betty is British now.
A、 Right.
B、Wrong.
C、Doesn't say.
(2). Betty has long beautiful hair.
A、 Right.
B、Wrong.
C、Doesn't say.
(3). Ray likes his job.
A、 Right.
B、Wrong.
C、Doesn't say.
(4). Both Betty and Ray like traveling.
A、 Right.
B、Wrong.
C、Doesn't say.
(5). Betty can play the piano well.
A、 Right.
B、Wrong.
C、Doesn't say.
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Common sense would tell us that physically active children may be more likely to become active and healthy adults.In the United States, elementary and middle schools are advised to give students two and a half hours of physical activity a week.That is what the Centers for Disease Control and Prevention and the American Heart Association recommend (推荐). They say high schools should provide about four hours of physical activity each week. Yet many schools across the country have reduced their physical education programs. Criticism of the cuts has led in some places to efforts to give students more time for exercise, not less.
The future health of Americans may depend on it. Just this week, a study reported that life expectancy (预期寿命) has fallen or is no longer increasing in some parts of the United States. The situation is worst among poor people in the southern states, and especially women. Public health researchers say it is largely the result of increases in obesity (肥胖), smoking and high blood pressure. They also blame differences in health services around the country.
In 2006, a study found that only four percent of elementary schools provided daily physical education all year for all grades. This was true of eight percent of middle schools and two percent of high schools. The study also found that 22 percent of all schools did not require students to take any P. E. (体育课).
Charlene Burgeson is the executive director of the National Association for Sport and Physical Education. She says one problem for P. E. teachers is that schools are under pressure to put more time into academic subjects. Also, parents may agree that children need exercise in school. Yet many parents today still have bad memories of being chosen last for teams because teachers favored the good athletes in class.
But experts say P. E. classes have changed. They say the goal has moved away from competition and toward personal performance, as a way tp build a lifetime of activity. These days, teachers often lead activities like weight training and yoga. Some parents like the idea of avoiding competitive sports in P.E class. Yet others surely dislike that idea. In the end, schools may find themselves in a no-win situation.
Why are schools recommended to give students certain time for sports？
A．Because different schools set up different physical education programs.
B．Because the physical activity of children will influence their health in adulthood.
C．Because nowadays children spend too much time on their studies.
D．Because only four percent of elementary schools provided daily physical education.
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It is customary for adults to forget how hard and dull and long school is. The learning by memory of all the basic things one must know is a most incredible and unending effort. School is not easy and it is not for the most part very much fun, but then, if you are very lucky, you may find a real teacher. Three teachers in a lifetime are the very best of my luck. My first was a science and math teacher in high school, my second, a professor of creative writing at Stanford, and my third was my friend and partner, ED Rickets.
I have to believe that a great teacher is a great artist and that three are as few as there are any other great artists. It might even be the greatest of the arts since the medium is the human mind and spirit.
My three teachers had these things in common: They all loved what they were doing; they did not tell, but stimulated a burning desire to know. Under their influence, the horizons sprang wide and fear went away and the unknown became knowable.
I shall speak only of my first teacher because in addition to the other things, she brought discovery. She aroused us to shouting, book-waving discussions. She had the noisiest class in school and she did not even seem to know it. We could never stick to the subject. Our speculation (思绪) ranged the world. She breathed curiosity into us so that we brought in facts or truths shielded in our hands like captured fireflies (萤火虫).
She was fired, and perhaps rightly so, for failing to teach fundamentals. Such things must be learned. But she left a passion in us for the pure knowable world and she inflamed me with a curiosity which has never left. I have had many teachers who told me soon-forgotten facts but only three who created in me a new attitude a new hunger. What deathless power lies in the hands of such a person？
21. In the writer’s opinion, school life is usually .
A. exciting B. interesting C. tiresome D. challenging
22. We can infer from Paragraph 2 that .
A. it is easy to find great artists as well as great teachers.
B. there are few great teachers but many great artists.
C. the greatest artists are not easy to find; nor are the greatest teachers.
D. being a great teacher is a great art to learn because teachers spread knowledge.
23. In the writer’s opinion, a good teacher should .
A. teach students the fundamental things
B. stick to one subject and be strict with students
C. teach students the knowledge ranging the world
D. arouse students’ curiosity and desire for the world
24. The writer’s first teacher was dismissed mainly because .
A. her class was the noisiest in school
B. she did not teach basic knowledge in class
C. she let students shout and wave books in class
D. she did not know how to teach basic knowledge effectively
25. What is the best title of this article？
A. The Teachers in My Life B. How to Become a Teacher
C. What to Teach at School D. What Makes a Good Teacher
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In-house personnel may be highly motivated and fit in but many tend to （) old ideas.
A . reprise
B. reprint
C. reproof
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The price is too high, and（),the house isn’t in a suitable position.
A、nevertheless
B、moreover
C、shill
D、yet
