2015年金太阳高考物理押题1
2015届全国新课标Ⅰ卷高三预测金卷物理试题及答案
2015届高三预测金卷（新课标I卷）理综物理14．在物理学发展的过程中，有许多伟大的科学家做出了突出贡献。
关于科学家和他们的贡献，下列说法正确的是（）A．英国物理学家法拉第电磁学等方面做出了杰出贡献，成功地发现了法拉第电磁感应定律B．德国天文学家开普勒对他导师第谷观测的行星数据进行多年研究，得出了万有引力定律C．英国物理学家卡文迪许利用卡文迪许扭秤首先较准确的测定了静电力常量D．古希腊学者亚里士多德认为物体下落快慢由它们的重量决定，伽利略利用逻辑推断使亚里士多德的理论陷入了困境15.如图，一小球从一半圆轨道左端A点正上方某处开始做平抛运动（小球可视为质点），飞行过程中恰好与半圆轨道相切于B点。
O为半圆轨道圆心，半圆轨道半径为R，OB与水平方向夹角为60°，重力加速度为g，则小球抛出时的初速度为A．3gR2B.33gR2C．3gR2D.3gR316、质量为2kg的物体静止在足够大的水平面上，物体与地面间的动摩擦因数为0．2，最大静摩擦力和滑动摩擦力大小视为相等。
从t=0时刻开始，物体受到方向不变、大小呈周期性变化的水平拉力F的作用，F随时间t的变化规律如图所示。
重力加速度g取10m/s2，则物体在t=0到t=12s这段时间内的位移大小为A．18m B．54mC．72m D．198m17、在空间直角坐标系Oxyz中，有一四面体C-AOB，C、A、O、B为四面体的四个顶点，且O（0，0，0）、A（L，0，0）、B（0，L，0）、C（0，0，L），D（2L，0，0）是x轴上一点，在坐标原点O处固定着+Q的点电荷，下列说法正确的是（）A.A、B、C三点的电场强度相同B.电势差U OA =U ADC.将一电子由C点分别移动到A、B两点，电场力做功相同D.电子在A点的电势能大于在D点的电势能18. 如图所示，匀强电场中，一个带正电的物体沿绝缘天棚平面在水平方向上做匀速直线运动。
从某时刻（设为t = 0）起，电场强度从E0均匀增大。
2015年高考押题卷(一)解析29个
一、本大题共7小题。
每小题6分，共42分。
1．下列关于物质的分类说法不正确的是：A.金刚石、白磷都属于单质B.碳酸钙、冰水都属于纯净物C.氯化铵、次氯酸都属于强电解质D.淀粉、蛋白质都属于高分子化合物考点：物质的分类、混合物和纯净物、强电解质和弱电解质的概念题型：选择题思路：根据物质的分类来区分即可。
解析：金刚石、白磷都属于单质；冰水混合物是纯净物；次氯酸属于弱电解质；淀粉、纤维素、蛋白质都属于高分子化合物。
故选C.总结：本题考查单质、纯净物、强弱电解质以及高分子化合物的定义，难度不大，旨在考查学生对基础知识的识记，注意基础知识的积累掌握．2．下列实验不能达到目的的是A．只滴加氨水鉴别NaCl、AlCl3、MgCl2、Na2SO4四种溶液B．将Al2(SO4)3溶液蒸干制备Al2(SO4)3固体C．用萃取分液的方法分离苯和水D．用可见光束照射以区别溶液和胶体考点：考查物质的分离、提纯题型：选择题思路：分离提纯方法的选择思路是根据分离提纯物的性质和状态来定的。
具体如下：①分离提纯物是固体(从简单到复杂方法) ：加热(灼烧、升华、热分解)，溶解，过滤(洗涤沉淀)，蒸发，结晶(重结晶)；②分离提纯物是液体(从简单到复杂方法) ：分液，萃取，蒸馏；③分离提纯物是胶体:盐析或渗析；④分离提纯物是气体：洗气。
解析：氨水与氯化镁氯化铝反应均生成白色沉淀；Al2(SO4)3溶液蒸干不分解；苯和水不互溶；区分胶体和溶液用丁达尔效应。
故选A.总结：本题考查物质的分离、提纯，只要掌握各物质的性质即可解决，难度不大。
3．下列叙述正确的是A．SO2使品红褪色与乙烯使KMnO4溶液褪色的原理相同B．制备乙酸乙酯时可用热的NaOH溶液收集产物以除去其中的乙酸．用饱和食盐水替代水跟电石反应，可以加快乙炔的产生速率(g)O3＋－Ksp(AgCl)＞Ksp(AgI)。
已知：-。
2015年高考压轴冲刺卷新课标I(一)物理试题 (Word版含答案)
2015年高考压轴冲刺卷•新课标I（一）理科综合（物理）一、选择题：本题共8小题，每小题6分，在每小题给出的四个选项中，第1～5题只有一项符合题目要求，第6～8题有多项符合题目要求。
全部选对的得6分，选对但不全的得3分，有选错的得0分。
1(安阳2014—2015第二次监测)15．《机动车驾驶证申领和使用规定》已经正式施行，司机闯黄灯要扣6分，被称为“史上最严交规”。
某小轿车驾驶员看到绿灯开始闪时，经短暂思考后开始刹车，小轿车在黄灯刚亮时恰停在停车线上，v一t图线如图所示。
若绿灯开始闪烁时小轿车距停车线距离L＝10．5m，则绿灯开始闪烁到黄灯刚亮的时间t0为（）A．0．5 s B．1．5 sC．3 s D．3．5 s2．(上饶2015•二次模•15)如图所示，在光滑的水平面上有一段长为L、质量分布均匀的绳子。
在水平向左的恒力Ｆ作用下从静止开始做匀加速运动。
绳子中某点到绳子左端的距离为x，设该处绳的张力大小为T，则能正确描述T与x之间的关系的图象是：3. (2015•第三次四校联考•16) A、D分别是斜面的顶端、底端，B、C是斜面上的两个点，AB ＝BC＝CD，E点在D点的正上方，与A等高。
从E点以一定的水平速度抛出质量相等的两个小球，球1落在B点，球2落在C点，关于球1和球2从抛出到落在斜面上的运动过程（）A．球1和球2运动的时间之比为2∶1B．球1和球2动能增加量之比为1∶3C．球1和球2抛出时初速度之比为22∶1D．球1和球2运动时的加速度之比为1∶24．(2015·第二次大联考【四川卷】·5)如图所示，电源电动势为E，内电阻为r，电表为理想电表，灯泡电阻恒定，当滑动变阻器的滑片由a端滑向b端的过程中，下列说法正确的是（）A．灯泡消耗的功率逐渐增大B．电压表、电流表示数均减小C．电源消耗的总功率增大，热功率减小D. 电压表、电流表示数的比值不变5．(2015•西安八校联考•15）光滑水平面上静止的物体，受到一个水平拉力作用开始运动，拉力F随时间t变化的图象如图所示，用分别表示物体的动能、速度、位移和加速度，下列四个图象分别定性描述了这些物理量随时间变化的情况，其中正确的是（）6．(2015•陕西西工大附中四模•7)如图，L1和L2为两平行的虚线，L1上方和L2下方都是垂直纸面向里的磁感强度相同的匀强磁场，A、B两点都在L2上．带电粒子从A点以初速v与L2成α角斜向上射出，经过偏转后正好过B点，经过B点时速度方向也斜向上．不计重力，下列说法中正确的是（）A．此粒子一定带正电荷B．带电粒子经过B点时速度一定跟在A点时速度相同C．若α=30°角时，带电粒子经过偏转后正好过B点，则α=45°角时，带电粒子经过偏转后也一定经过同一个B点D ． 若α=30°角时，带电粒子经过偏转后正好过B 点，则α=60°角时，带电粒子经过偏转后也一定经过同一个B 点7.(唐山2015•二模•19)甲乙为两颗地球卫星，其中甲轨道为圆，乙轨道为椭圆，圆轨道的直径与椭圆轨道的长轴相等，如图所示，P 点为两轨道的一个交点。
泄露天机——2015年金太阳高考押题 物理 (学生用卷)英语 (学生用卷)
考试中心——2015年高考押题英语本卷共18题，三种题型：阅读理解、英语知识运用和写作。
阅读理解10小题，英语知识运用4小题，写作4小题。
第一部分阅读理解 (10小题)第一节阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在题卡上将该项涂黑。
A1A report from the American Academy of Arts and Sciences' Commission reveals that, due to a job market which disproportionately rewards graduates in STEM (science, technology, engineering, and mathematics) fields, more and more students are seeking degrees in business and hard-science subjects.Some institutions have responded by cutting budgets in the arts and humanities and directing those funds elsewhere. That's the wrong thing to do. The humanities study of languages, literature, history, philosophy, religion, ethics, etc.-and the arts are vital to our future. We should be investing more funds, more time and more expertise, not less, into these endeavors.What detractors（诋毁者）of the "soft" subjects miss is that the arts and humanities provide an essential framework and context for understanding the wider world. Studying the humanities strengthens the ability to communicate and work with others. It allows students to develop broad intellectual and cultural understanding; it nurtures creativity and deepens participation in public discourse and modem democracy.The commission's report points out that "at the very moment when China is seeking to adopt our model of broad education in the humanities, social sciences and natural sciences as a stimulus to invention, the United States is instead narrowing our focus and abandoning our sense of what education has been and should continue to be our sense of what makes America great."These are the telling statistics: First, federal funding for helping American students include international training in their education has been cut 41 percent in four years. Second, the National Assessment of Educational Progress test shows that only less than a quarter of eighth- and 12th-grade US students are proficient in reading, writing and civics.How can we possibly equip the US for its leadership role in an increasingly connected world if we are not adequately teaching students to communicate and helping them understand and encounter diverse perspectives? If we fail to invest in the arts and humanities, our country's future leaders will not have the ability to connect on an emotional level with others. This ability is developed by studying the humanities, and in the global community this skill is not optional - it's essential.In a word, we must enthusiastically support and fund the study of the arts and humanities. For anyone concerned with how this translates into a sound economy and a sound financial future,simply recall what Steve Jobs told graduates of Stanford University in 2005: One of the most influential experiences in his brief time at Reed College was his exposure to the fine art of calligraphy（书法）．It taught him the important lesson of the relationship between discipline and creativity.1. What can be inferred from the passage?A. Business and hard-science subjects are based upon the arts and humanities.B. At present too much emphasis and investment are put on science in America.C. More students will learn the arts and humanities instead of science in the USA.D. China has spent more money in the humanities and social sciences than the USA.2. The author mentions Steve Jobs in the last paragraph to prove that _____.A. science has a close relationship with the arts and humanitiesB. investment in the arts and humanities promotes economic developmentC. calligraphy plays a determining role in Steve Jobs' accomplishmentD. Reed College supports and funds the study of the arts and humanities3. Which of the following is the most suitable title for this passage?A. Significance of arts and humanitiesB. Key qualities of future leadersC. Decline of arts and humanitiesD. Rise and fall of hard sciencesA2Fuel Cell Technology for CarsFill her up with hydrogen? That's what someCalifornia motorists may be saying soon, as car makers tryto speed up production of zero emission（零排放）cars tomeet state requirements in the near future.Beneath the skin of this ordinary looking HondasFCX Concept Vehicle sits an electro-chemical reactor: ahand built, astronomically expensive power plant knownas a fuel cell. It's expected to be running ordinary family cars on California's roads within three years.So what exactly is a fuel cell, anyway? Why are governments, private businesses and academic institutions cooperating to develop and produce them? A fuel cell, very simply described, is a power generator, making electricity through the combination of hydrogen and oxygen. Fuel cells generate electrical power quietly and efficiently, without pollution, unlike power sources that use fossil fuels, the only by-products from an operating fuel cell are heat and water. To be more technical about it, a hydrogen atom with its one electron, attempts to pass through a fuel cell membrane（膜）to unite with an oxygen atom. The membrane allows only the hydrogen proton （质子）to pass through, forcing its electron to run around the membrane to catch up with the proton on the other side. This creates electricity, water, and heat, but no exhaust emissions.If the fuel cell is powered with pure hydrogen, it has the potential to be up to 80-percent efficient, That is, it turns 80 percent of the energy content of the hydrogen into electrical energy. However, we still need to turn the electrical energy into mechanical work. This is accomplished by the electric motor. A reasonable number for the efficiency of the motor is about 80 percent. So wehave 80-percent efficiency in generating electricity, and 80-percent efficiency turning it into mechanical power. That gives an overall efficiency of about64 percent. Honda's FCX concept vehicle reportedly has 60-percent energy efficiency, which is twice or even three times more efficient than usual cars.But in spite of all the advantages described above, experts say, "We still have technical challenges getting this extremely complex system to work properly, the way customers expect it to work. There are challenges in using new fuels, and providing the new fuel basic facilities. And before fuel cell vehicles hit the road, there will have to be a network of hydrogen stations that will allow drivers to fill up with the flammable gas, under 36-hundred pounds of pressure."4. What can be inferred from California's "zero emissions policy"?A. New cars with fuel cell technology will surely become much cheaper.B. By carrying out the policy, traffic will not be so busy as it is now.C. The quality of life in California will improve once this policy is in effect.D. With facilities of new kinds, more local employment will be created.5. What does the phrase "power plant" refer to?A. A power device generating electricity.B. A power station providing electricity.C. A power component consuming electricity.D. A power engine using electricity.6. One of the reasons why fuel cell powered vehicles are superior is that . .A. they give out almost no water or heatB. they run faster and more smoothlyC. they give out almost no noiseD. they turn 64% of the energy into electricity7. What does the author want to tell us in the last paragraph?A. Customers will not think it a good idea to develop fuel cell technology.B. It is still not very easy to speed up production of zero emission cars.C. We can't ignore the financial problems to build a network of hydrogen stations.D. We still have much difficulty turning all the chains of the business into reality.A3When DeKalb Walcott III was just 8 years old, his father, a Chicago fire chief, let him tag along on a call. DeKalb says a lot of kids idolized basketball player Michael Jordan when he was growing up in Chicago in the 1990s. Not him."I wanted to be like DeKalb Walcott Jr.," he says of his father.So when his dad asked if he wanted to go on that call with him when he was 8, DeKalb was excited. "I'm jumping up and down, saying, "Mom, can I go? Can I go?' "The experience changed DeKalb’s life, he tells his dad on a visit to Story Corps. "My eyes got big from the moment the alarm went off." the younger DeKalb says. “This is the life that I want to live someday.”Now 27, the younger DeKalb is living that life. He became a firefighter at 21 and went to work alongside his dad at the Chicago Fire Department. Before his father retired, the pair even went out on a call together — father supervising（监督）son."You know, it's everything for me to watch you grow," his father says. But he also recalls worrying about one particular fire that his son faced."I received a phone call that night. And they said, 'Well, your son was at this fire.' I said, 'OK, which way is this conversation going to go?' “DeKalb Walcott Jr. recalls."And they said, 'but he's OK. And he put it out all by himself. Everybody here was proud ofhim.'"And the word went around, 'Who was out there managing that fire? Oh, that's Walcott! That's Walcott up there!' So, you know, moments like that, it's heaven on Earth for a dad."DeKalb Walcott Jr. retired in 2009. The younger DeKalb says he's proud of being a second-generation firefighter. "You know, it makes me look forward to fatherhood as well, because I'm definitely looking forward to passing that torch down to my son."8. The underlined phrase tag along in Paragraph 1 is closest in meaning to ______.A. put out fireB. watch basketballC. follow his fatherD. ask his mother’s permission9. DeKalb Walcott III determined to become a firefighter at the age of _________.A. 8B. 21C. 27D. 3510. What did DeKalb Walcott Jr want to do before he was told that the fire was put out?A. Go on with the conversationB. Put it out all by himselfC. Supervise his sonD. Go to the fire scene11. What can we learn from the last paragraph?A. DeKalb Walcott Jr is proud to be a second-generation firefighter.B. DeKalb Walcott III wants his son to become a firefighter too.C. DeKalb Walcott Jr wants to pass the torch to DeKalb Walcott III.D. DeKalb Walcott III is proud that his son has become an excellent firefighter.A4Engineers should embrace（接受）the arts, Sir John O'Reilly, a fellow of the Institution of Engineering and Technology, argued in a lecture.About 59% of engineering companies in the IET's 2014 survey feared skill shortages could threaten（威胁）business."There is nothing as creative as engineering," Sir John told the reporter. He says science, technology, engineering and mathematics - often known as "Stem" subjects, are vital for a modern knowledge economy. But there is a massive shortfall in the number of recruits（招聘）- with a recent study by the Royal Academy of Engineering saying the UK needs to increase by as much as 50% the number of Stem graduates it produces.Delivering this year's Mountbatten Lecture at the Royal Institution, Sir John argued that engineers should recognise the role of the arts in their work - among other benefits; this could attract more people into the profession. The lecture, Full Steam Ahead for Growth, advocated a wider adoption -- Steam, or science, technology, engineering, arts and maths. Engineers should embrace the arts as being key to creativity and an important component of innovation（创新）, crucial to creating new products and boosting future competitiveness, he argued. "Engineering and technology is an increasingly diverse and creative field," said Sir John.Some university engineering departments already cooperated with art schools to develop understanding, he told the reporter. In particular he mentioned Cranfield University's Centre forCreative Competitive Design and Imperial College's work with the Royal College of Art. The two sets of people could work well together and more emphasis on the creative side of engineering could improve the success of products, he said."Aesthetics(美学) is part of it," he told the reporter, adding that Apple's iPod was not the first digital media player, nor the only one that worked - but it came to dominate the market "because it was nice to have".Sir John said he was not suggesting universities started requiring A-level art from engineering applicants - the key subjects for admission would continue to be maths and the sciences. But an emphasis on creative skills would help "broaden the pool and attract more people in".12. According to the lecture Full Steam Ahead for Growth, _______.A. engineers should cooperate with arts majorsB. Accepting the arts could attract more people into engineeringC. engineers should realize arts play the most important part in their workD. engineering and technology is as diverse and creative as before13. By giving the example of Apple's iPod, Sir John intends to _______.A. stress the importance of artsB. stress the importance of marketingC. stress the importance of communicationD. stress the importance of science and technology14. Which of the following is true according to the passage?A. More university students should study arts instead of engineering.B. Engineering and technology is increasingly different and unrelated fields.C. The IET's skills survey raised concerns about the number of recruits to engineering.D. Students from some university engineering departments have already transferred to art schools15. What is the passage mainly about?A. Lack of creativity makes it difficult for the engineering major to find a satisfactory job.B. The key subjects for engineering majors remain to be maths and the sciences rather than arts.C. University engineering departments should cooperate with art schools to improve the success of products.D. Engineering needs to emphasize its creative side to encourage more young people to choose it as a career.B1Exercise seems to be good for the human brain, with many recent studies suggesting that regular exercise improves memory and thinking skills. But an interesting new study asks whether the apparent cognitive benefits from exercise are real or just a placebo effect — that is, if we think we will be “smarter” after exercise, do our brains respond accordingly? The answer has significant implications for any of us hoping to use exercise to keep our minds sharp throughout our lives.While many studies suggest that exercise may have cognitive benefits, recently some scientists have begun to question whether the apparently beneficial effects of exercise on thinkingmight be a placebo effect. So researchers at Florida State University in Tallahassee and the University of Illinois at Urbana-Champaign decided to focus on expectations, on what people anticipate that exercise will do for thinking. If people’s expectations jibe (吻合) closely with the actual benefits, then at least some of those improvements are probably a result of the placebo effect and not of exercise.For the new study, which was published last month in PLOS One, the researchers recruited 171 people through an online survey system, they asked half of these volunteers to estimate by how much a stretching and toning regimens (拉伸运动) performed three times a week might improve various measures of thinking. The other volunteers were asked the same questions, but about a regular walking program.In actual experiments, stretching and toning program generally have little if any impact on people’s cognitive skills. Walking, on the other hand, seems to substantially improve thinking ability.But the survey respondents believed the opposite, estimating that the stretching and toning program would be more beneficial for the mind than walking. The estimates of benefits from walking were lower.These data, while they do not involve any actual exercise, are good news for people who do exercise. “The results from our study suggest that the benefits of aerobic exercise are not a placebo effec t,” said Cary Stothart, a graduate student in cognitive psychology at Florida State University, who led the study.If expectations had been driving the improvements in cognition seen in studies after exercise, Mr. Stothart said, then people should have expected walking to be more beneficial for thinking than stretching. They didn’t, implying that the changes in the brain and thinking after exercise are physiologically genuine.The findings are strong enough to suggest that exercise really does change the brain and may, in the process, improve thinking, Mr. Stothart said. That conclusion should encourage scientists to look even more closely into how, at a molecular level, exercise remodels the human brain, he said. It also should encourage the rest of us to move, since the benefits are, it seems, not imaginary, even if they are in our head.1. Why did the researchers at the two universities conduct the research?A. To discover the placebo effect in the exercise.B. To prove the previous studies have a big drawback.C. To test whether exercise can really improve cognition.D. To encourage more scientists to get involved in the research.2. What can we know about the research Cary Stothart and his team carried out?A. They employed 171 people to take part in the actual exercise.B. The result of the research removed the recent doubt of some scientists.C. The participants thought walking had a greater impact on thinking ability.D. Their conclusion drives scientists to do research on the placebo effect.3. What might be the best title for the passage?A. Is it necessary for us to take exercise?B. How should people exercise properly?C. What makes us smarter during exercise?D. Does exercise really make us smarter?B2The current Ebola (埃博拉病毒) outbreak in western and central Africa has infected at least 3,069 people, including 1,552 dead, making it the largest outbreak in history. Ebola is a deadly virus —about 60 percent of people infected with it have died.How is Ebola doing its harm?When a per son becomes infected with Ebola, the virus damages the body’s immune (免疫的) cells, which defend against infection, said a researcher at Lancaster University. But if a person’s immune system can stand up to this attack, then he is more likely to survive the disease.The patients that survive it best are those who don’t get such a bad disadvantage in immune system. But if the body isn’t able to get rid of this attack, then the immune system becomes less able to regulate (调节) itself. This means the immune system is more likely to run out of control, leading to a drop in blood pressure, multi-organ failure and eventually death.What are the common symptoms of the disease?Fever. Headache. Joint and muscle aches. Weakness. Diarrhea. Vomiting. Stomach pain. Lack of appetite. Chills. Rash. Redness in the eyes. Hiccups. Cough. Sore throat. Chest pain. Difficult breathing or swallowing. Bleeding inside and outside of the body.How to prevent the spread of Ebola?Ebola can be spread primarily via direct contact with patients, specifically the blood and fluids of an infected patient.We should avoid contact with infected patients and objects such as clothing, bedding, and needles used by them. Avoid areas where infections have been reported. For now, the disease has only been confirmed in central and West Africa, four cases in America and Europe. Avoid eating wild-caught bush meat. Researchers have suspected that the disease came to humans via animals, probably through the meat of primates(灵长类). If you’re in an area wher e the disease has been reported, avoid purchasing, eating, or handling wild game to stay on the safe side.Wear protective medical clothing if you’re around infected patients. Extreme caution is necessary. Hospital workers must use masks, gloves, goggles, and gowns, which needed to be worn at all times if you’re around infected patients.How Do People Survive Ebola?Doctors don’t know for certain who will survive Ebola, and there is no specific treatment or cure for the disease. Although in the minority, some people do recover from infection.Our suggestions include:Maintain your electrolytes (电解质) and body liquid. Sports drinks can be used. Monitor your blood pressure and control it if necessary. Dropping blood pressure may be a serious sign of infection. Breathe in an oxygen-rich environment. Quickly address any symptoms of infection. Be honest about when and where you’re feeling pain.4. Ebola causes the death of a human being by ________.A. attacking him with high feverB. regulating his immune systemC. damaging his immune cellsD. harming all his organs directly5. What is NOT mentioned as the symptom of Ebola?A. Fever and chills.B. Swallowing difficulty.C. Loss of blood.D. High blood pressure.6. In order not to be infected by Ebola, we should _________.A. have the clothing of the infected cleanedB. avoid eating wild animals like monkeysC. not travel to Africa, America or EuropeD. stay at home without going anywhere7. It is true that ________.A. a certain number of people survive EbolaB. human has found a special cure for EbolaC. oxygen can save infected people’s livesD. low blood pressure is surely caused by EbolaB3The term “Industry 4.0” refers to the fourth industrial revolution. The first industrial revolution was the production of goods with machines like steam engines, which was followed by the second industrial revolution that introduced mass production with the help of electric power, followed by the digital revolution —the use of electronics and IT in production.Industry 4.0 is a high-tech project, which promotes the computerization of manufacturing (制造业). The basic principle of Industry 4.0 is that by connecting machines, work pieces and systems, we are creating intelligent networks along the entire value chain that can control each other automatically. The goal is the Smart Factory, which adapts well and uses resources efficiently as well as linking customers and business partners with great intelligence. Technological basis are the Internet systems and advanced factories. Experts believe that Industry 4.0 could be a reality in about 10 to 20 years.So, what effects does this change have on the classic manufacturing? According to an expert, “it is highly likely that the world of production wi ll become more and more networked until everything is connected with everything else.” Networks and processes have so far been limited to one factory. But in the time of Industry 4.0, the boundaries (界限) of individual factories will most likely no longer exist. Instead, they will be lifted in order to inter-connect multiple factories or even geographical regions.How is an Industry 4.0 factory different from a today’s factory? In current industry environment, providing high-end quality service or product with the least cost is the key to success. Factories are trying to increase their profit as much as possible. In the time of Industry 4.0, various data sources are available to provide worthwhile information about different aspects of the factory. Using data for understanding the current condition and checking faults and failures is a natural thing. The sharing of information around the clock and around the globe will enable these connected systems to manage themselves independently, work more efficiently and identify any errors quickly.The good news is that Europe is much better prepared for the Industry 4.0 revolution than one might think. Europe will position itself as a pioneer in the fourth revolution. Industry 4.0 is a project in the high-tech strategy of the German government. Meanwhile, in the U.S., some companies are also working hard on it. But the success of industry depends on whether business and politics can work together. It’s not only politics that needs to help open the door for Industry 4.0. Every company is advised to seize the new digital opportunities.8. What marks the coming of Industry 4.0?A. Steam engines.B. Mass production.C. Use of electronics.D. Intelligent networks.9. Industry 4.0 will probably result in ________ in the world of manufacturing.A. production limited to an individual factoryB. everything connected with everythingelseC. networks and processes no longer existingD. classic factories stopping their competition10What’s the meaning of the underlined p art in Para. 4?A. Sharing information of the world time.B. Global news broadcast at any time.C. Instant worldwide information exchange.D. Spreading news widely on the hour.11. According to the last paragraph, who is the most active in pushing Industry 4.0?A. The European companies.B. The American government.C. The American companies.D. The German government.B4“One City One Book” is a generic name (通称) for a community reading program that attempts to get everyone in a city to read and discuss the same book. Popular book picks have been Harper Lee’s To Kill a Mockingbird，Ernest Gaines’s A Lesson Before Dying，and Ray Bradbury’s Fahrenheit 451.“One City One Book” programs take the idea of a localized book discussion clu b and expand it to cover a whole city. The first such program was “If All of Seattle Read the Same Book” in 1998，started by Nancy Pearl at Seattle Public Library’s Washington Center for the Book. The book chosen for the program was The Sweet Hereafter by Russell Banks，written in 1991.Other cities copied the idea，and the Library of Congress listed 404 programs occurring in 2007.Each city’s program has its own goals；These typically include building a sense of community and promoting literacy. Nancy Pearl warns against expecting too much from a program：“Keep in mind that this is a library program，it’s not an exercise in civics，and that it’s not intended to have literature cure the racial divide. This is about a work of literature.”Programs typically involve more than having everyone read the same book. Some other activities that have been included are：book discussion sessions，scholarly lectures on the book or related topics，a visit by the author，exhibits，related arts programming (especially showing a movie of the book if there is one)，and integration into school curricula. In Boston the “One City One Story” program used shorter stories and distributed tens of thousands of free copies of the story over the course of a month.American Library Association puts out a detailed step-by-step guide on how to organize a local program，including the critical step of picking the one book. The Center for the Book at the Library of Congress tracks all known programs and the books they have used.12．“One City One Book” progr ams________.A．ask everyone in a city to donate one bookB．can rid a city of racial divide through readingC．choose short stories for people to readD．encourage everyone in a city to read and discuss the same book13．We know from the second parag raph that “One City One Book” programs________.A．became popular very quicklyB．have been held more than 400 times in SeattleC．were sponsored by the Library of CongressD．reached its peak in 200714．We can infer from the third paragraph that Nancy Pearl________.A．expects much from the programsB．doesn’t expect that the programs would run so wellC．has a practical attitude towards the programsD．believes the programs will push forward community building15．What kind of role does American Library Association play in the programs?。
全国新课标Ⅰ卷2015届高三预测金卷(理综)及答案
2015届高三预测金卷（新课标I卷）理综1、随着生活水平的提高和生活方式的改变，高血脂人群相对增多。
脂类在血液中以脂蛋白的形式进行运送，并可与细胞膜上存在的特异性受体相结合，进入细胞内进行代谢(如图所示)。
对该图分析不合理的是（）A．图中物质X很可能是具有识别功能的受体蛋白B．物质X在溶酶体酶的作用下被水解为氨基酸C．该过程的完成与生物膜的结构特点密切相关D．该过程需要消耗ATP直接提供的能量2、关于生物学实验的基本原理，叙述正确的是（）A．用健那绿染色时，在光学显微镜下可看到线粒体内膜某些部位向内腔折叠形成的嵴B．用双缩脲试剂鉴定蛋白质是因为其与蛋白质作用产生特定的紫色反应C．成熟植物细胞在高渗溶液中发生质壁分离是因为细胞壁有选择透过性D．向锥形瓶的酵母菌培养液通入空气是为了抑制无氧呼吸的需要3、研究发现，诱导人体表皮细胞使之具有胚胎干细胞活动特征，且这些细胞可以转变为心脏和神经细胞。
下列与此有关的说法不正确的是（）A. 诱导后的细胞具有分裂和分化能力B. 人体表皮细胞具有全能性C. 该研究说明细胞分化是可以逆转的D. 该研究可以为治疗心血管绝症提供帮助4、拟南芥细胞中某个基因编码蛋白质的区段插入了一个碱基对，下列分析正确的是（）A.根尖成熟区细胞一般均可发生此过程B.该细胞的子代细胞中遗传信息不会发生改变C.若该变异发生在基因中部，可能导致翻译过程提前终止D.若在插入位点再缺失3个碱基对，对其编码的蛋白质结构影响最小5、为控制野兔种群数量，澳洲引入一种主要由蚊子传播的兔病毒。
引入初期强毒性病毒比例最高，兔被强毒性病毒感染后很快死亡，致兔种群数量大幅下降。
兔被中毒性病毒感染后可存活一段时间。
几年后中毒性病毒比例最高，兔种群数量维持在低水平。
由此无法推断出( )A ．病毒感染对兔种群的抗性具有选择作用B ．毒性过强不利于维持病毒与兔的寄生关系C ．中毒性病毒比例升高是因为兔抗病毒能力下降所致D ．蚊子在兔和病毒之间的协同（共同）进化过程中发挥了作用6、当细胞癌变后，它会表达某种特殊的蛋白质于细胞表面而成为肿瘤表面抗原，但此时不能引发免疫反应。
2015年高考理综物理押题试卷及答案(word版可打印)
2015年高考理科综合押题试卷及答案一、选择题（本大题共7小题，每小题5分，在每小题给出的四个选项中，有的只有一项符合题目要求，有的有多项符合题目要求。
全部选对的得5分，选对但不全的得3分，有选错的得0分）14.质量为M的半球形物体A和质量为m的球形物体B紧靠着放在倾角为a的固定斜面上，并处于静止状态，如图所示。
忽略B球表面的摩擦力，则关于物体受力情况的判断正确的是A.物体A对物体B的弹力方向沿斜面向上B.物体A受到4个力的作用C.物体B对斜面的等于cosmg aD.物体B对物体A的压力大于sinmg a15.截止到2011年9月，欧洲天文学家已在太阳系外发现50余颗新行星，其中有一颗行星，其半径是地球半径的1.2倍，基平均密度是地球0.8倍。
经观测发现：该行星有两颗卫星a和b，它们绕该行星的轨道近似为圆周，周期分别为9天5小时和15天12小时，则下列判断正确的是A.该行星表面的重力加速度大于9.8m/s2B.该行星的第一宇宙速度大于7.9km/sC.卫星a的线程度小于卫星b的线速度D.卫星a的向心加速小于卫星b的向心加速度16.质量为1kg的物体在水平粗糙的地面上受到一水平外力F作用运动，如图甲所示，外力F和物体克服摩擦力f做的功W与物体位移x的关系如图乙所示，重力加速度g为10m/s2。
下列分析正确的是A.物体与地面之间的动摩擦因数为0.2B.物体运动位移为13mC.前3m运动过程中物体的加程度为3m/s2D.x=9m时，物体速度为/s 17.如图所示，图（a）中的理想变压器原线圈输入信号如图（b）所示（图线为正弦曲线），副线圈上通过输电线接有灯泡L和交流电压表；若灯泡和输电线的等效电阻均为R，原、副线圈匝数比为2：1，交流电压表为理想电表。
下列说法中正确的是A.电压表的示数为110VB.电压表的示数为55VC.副线圈中交变电压的频率为50HzD.副线圈中交变电压的频率为100 Hz18.一对等量正点电荷电场的电场线（实线）和等势线（虚线）如图所示，在两电荷的电场中A、B两点关于两点电荷连线的垂直平分线OO 对称，下列说法正确的是A. A、B两点的电场强度相同B. A、B两点的电势相同C.将正电荷由A移到B电场力做正功D.带相同电荷量的负电荷在A 点的电势能大于正电荷在A点的电势能19.如图甲所示，匀强磁场垂直纸面向里，磁感应强度的大小为B ，磁场在y 轴方向足够宽，在x 轴方向宽度为a 。
2015年高三6月物理押题试卷及答案
2015年高三第二学期6月下理科综合押题试卷及答案考试时间：150分钟满分：300分卷Ⅰ（126分）一：选择题。
本题共8小题，每小题6分。
14-18只有一个选项是符合题目要求的。
19-21有多个选项符合题目要求的，全部选对的得6分，选对但不全的得3分，有选错的得0分。
14.轻质弹簧A的两端分别连在质量为m1和m2的小球上，两球均可视为质点。
另有两根与A完全相同的轻质弹簧B、C的一端分别与两个小球相连，B的另一端固定在天花板上，C的另一端用手牵住，如图所示。
适当调节手的高度与用力的方向，保持B弹簧轴线跟竖直方向夹角为37°不变（已知sin 37=0.6，cos 37=0.8），当弹簧C的拉力最小时，B、C两弹簧的形变量之比为A．1：1 B．3：5 C．4:3 D．5：415．如图所示，细绳一端固定在天花板上的O点，另一端穿过一张CD光盘的中央小孔后拴着一个橡胶球，橡胶球静止时，竖直悬线刚好挨着水平桌面的边沿。
现将CD光盘按在桌面上，并沿桌面边缘以速度v匀速移动，移动过程中，CD光盘中央小孔始终紧挨桌面边线，当悬线与竖直方向的夹角为θ时，小球上升的速度大小为A．vsinθ B．vcosθ C．vtanθ D．vcotθ16. 2014年3月8日凌晨马航客机失联后，西安卫星测控中心紧急调动海洋、风云、高分、遥感4个型号近10颗卫星，为地面搜救提供技术支持。
特别是“高分一号”突破了空间分辨率、多光谱与大覆盖面积相结合的大量关键技术。
如图为“高分一号”与北斗导航系统两颗卫星在空中某一面内运动的示意图。
“北斗”系统中两颗卫星“G 1”和“G 3”以及“高分一号”均可认为绕地心O 做匀速圆周运动。
卫星“G 1”和“G 3”的轨道半径为r ，某时刻两颗工作卫星分别位于轨道上的A 、B 两位置，“高分一号”在C 位置。
若卫星均顺时针运行，地球表面处的重力加速度为g ，地球半径为R ，不计卫星间的相互作用力。
2015年高考理综押题试卷及答案(word版可打印)
2015年高考理科综合押题试卷及答案第I卷(必做，共87分)一、选择题(本题包括13小题，每小题只有一个选项符合题意) 1．关于水在人体内的生理作用，下列叙述正确的是A．膝跳反射的兴奋传导离不开水B．基因表达的翻译过程没有水生成C．种子晒干后失去了全部的自由水，只剩下结合水D．当细胞衰老时，水分的含量降低，细胞核体积减小2．20世纪90年代，Cuenoud等发现DNA也有酶催化活性。
他们根据共有序列设计并合成了由47个核苷酸组成的单链DNA-E47，它可以催化两个DNA片段之间的连接。
下列有关叙述正确的是A．在DNA-E47中，嘌呤碱基数一定等于嘧啶碱基数B．在DNA-E47中，碱基数=脱氧核苷酸数=脱氧核糖数C．DNA-E47作用的底物和DNA聚合酶作用的底物是相同的D．在DNA-E47中，每个脱氧核糖上均连有一个磷酸和一个含N碱基3．在水稻根尖成熟区表皮细胞中能正常完成的生理活动有①核DNA→核DNA ②合成RNA聚合酶③mRNA→蛋白质④K+协助扩散进入细胞⑤染色质螺旋变短变粗⑥[H]+O2→H2O ⑦H2O→[H]+O2⑧渗透作用A．①③⑤⑦ B．②④⑥⑧C．①③⑥⑧ D．②③⑥⑧4．下列有关遗传和进化问题的分析中，错误的是A．遗传和变异是进化的内因，通过遗传使控制性状的基因在子代中得以传递B．地理隔离可阻止种群间基因交流，种群间基因库的差异可导致生殖隔离C．细菌抗药性的产生是由于人们滥用抗生素诱发了细菌发生基因突变D．种群既是生物进化的基本单位，也是生物繁殖的基本单位5．如图表示一神经细胞动作电位和静息电位相互转变过程中的离子运输途径。
该细胞受到刺激时，通过④途径运输离子，形成动作电位。
下列说法正确的是A．④途径的发生只能由电信号引起B．由图可知，②③途径属于主动运输C．正常情况下，▲离子的细胞外浓度高于细胞内D．静息时，由于①途径的作用，膜电位分布为内正外负6．DNA聚合酶可通过选择性添加正确的核苷酸和移除错配的核苷酸保证复制的准确性。
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泄露天机——2015年金太阳高考押题 精粹物 理本卷共46题，包括必考与选考两部分，三种题型：选择题、实验题和解答题。
一、选择题（22个小题）1．下列说法正确的是（ ）A ．电荷的周围既有电场也有磁场，反映了电和磁是密不可分的B ．由电场强度的定义式qFE =可知E 的方向决定于q 的正负 C ．法拉第首先总结出磁场对电流作用力的规律D ．“电生磁”和“磁生电”都是在变化、运动的过程中才能出现的效应答案：D解析：静止的电荷周围只有电场，没有磁场，A 错；E 的正负与检验电荷无关，B 错；安培首先总结出磁场对电流的作用，C 错。
2．在物理学的发展过程中，许多物理学家都做出了重要的贡献，他们也创造出了许多物理学研究方法，下列关于物理学研究方法的叙述中正确的是（ ） A ．质点、速度、点电荷等都是理想化模型 B ．物理学中所有物理量都是采用比值法定义的C ．伽利略开创了实验研究和逻辑推理相结合探索物理规律的科学方法D ．重心、合力和交变电流的有效值等概念的建立都体现了等效替代的思想答案：CD解析：速度不是理想化模型，A 错；并不是所有的物理公式都是用比值定义法定义的，如场强qF E =，电容U QC =都不是比值定义的，故B 错误；C 、D 正确。
3.下列叙述正确的是 （ ）A ．力、长度和时间是力学中三个基本物理量，它们的单位牛顿、米和秒就是基本单位B ．伽利略用“月—地检验”证实了万有引力定律的正确性C ．法拉第最先提出电荷周围存在电场的观点D ．牛顿在给出万有引力定律的同时给出了引力常量答案：C 解析：质量、长度和时间是力学中三个基本物理量，它们的单位千克、米和秒就是基本单位，故A 错误；法拉第最先提出电荷周围存在电场的观点，故C 正确;牛顿用“月—地检验”证实了万有引力定律的正确性，故B 错误；卡文迪许测出了引力常量，故D 错误。
4.甲、乙两球质量分别为1m 、2m ，从同一地点（足够高）处同时由静止释放。
两球下落过程所受空气阻力大小f 仅与球的速率v 成正比，与球的质量无关，即kv f =（k 为正的常量）。
两球的t v -图象如图所示。
落地前，经时间0t 两球的速度都已达到各自的稳定值1v 、2v 。
则下列判断正确的是 （ ）A ．释放瞬间甲球加速度较大B ．1221v v m m = C ．甲球质量大于乙球 D ．0t 时间内两球下落的高度相等答案：C解析：释放瞬间0=v ，因此空气阻力0=f ，两球均只受重力，加速度均为重力加速度g ，故A 错误;B 、C 两球先做加速度减小的加速运动，最后都做匀速运动，稳定时mg kv =，因此最大速度与其质量成正比，即m v m ∝，2121v vm m =，由图象知1v >2v ，因此甲m ＞乙m ；故B错误，C 正确; 图象与时间轴围成的面积表示物体通过的位移，由图可知，t 0时间内两球下落的高度不相等；故D 错误。
5．如图a 所示，小物体从竖直弹簧上方离地高1h 处由静止释放，其动能k E 与离地高度h 的关系如图b 所示．其中高度从1h 下降到2h ，图象为直线，其余部分为曲线，3h 对应图象的最高点，轻弹簧劲度系数为k ，小物体质量为m ，重力加速度为g ．以下说法正确的是( )A ．小物体下降至高度3h 时，弹簧形变量为0B ．小物体下落至高度5h 时，加速度为0C ．小物体从高度2h 下降到4h ，弹簧的弹性势能增加了kg m 22D ．小物体从高度1h 下降到5h ，弹簧的最大弹性势能为)(51h h mg -答案：D解析：高度从1h 下降到2h ，图象为直线，该过程是自由落体，21h h -的坐标就是自由下落的高度，所以小物体下降至高度2h 时，弹簧形变量为0,故A 错误；物体的动能先增大，后减小，小物体下落至高度4h 时，物体的动能与2h 时的动能相同，由弹簧振子运动的对称性可知，在4h 时弹簧的弹力一定是重力的2倍；小物体下落至高度5h 时，动能又回到0，说明5h 是最低点，弹簧的弹力到达最大值，一定大于重力的2倍，所以此时物体的加速度最大,故B 错误；小物体下落至高度4h 时，物体的动能与2h 时的动能相同，由弹簧振子运动的对称性可知，在4h 时弹簧的弹力一定是重力的2倍；此时弹簧的压缩量kmgx 2=∆，小物体从高度2h 下降到4h ，重力做功kg m k mg mg x mg W 2222=⨯=∆=;物体从高度2h 下降到4h ，重力做功等于弹簧的弹性势能增加，所以小物体从高度2h 下降到4h ，弹簧的弹性势能增加了kg m 222,故C 错误；小物体从高度1h 下降到5h ，重力做功等于弹簧弹性势能的增大，所以弹簧的最大弹性势能为)(51h h mg -,故D 正确。
6. 如图甲所示，以速度v 逆时针匀速转动的足够长的传送带与水平面的夹角为θ。
现将一个质量为m 的小木块轻轻地放在传送带的上端，小木块与传送带间的动摩擦因数为μ，则乙图中能够正确地描述小木块的速度随时间变化关系的图线可能是（ ）答案：CD解析：木块放上后一定先向下加速，由于传送带足够长，所以一定有木块速度大小等于传送带速度大小的机会，此时若重力沿传送带向下的分力大小大于最大静摩擦力，则之后木块继续加速，但加速度变小了；若重力沿传送带向下的分力大小小于或等于最大静摩擦力，则木块将随传送带匀速运动；故C 、D 正确，A 、B 错误。
7．在一笔直公路上有a 、b 、c 三辆汽车，它们同时经过同一路标开始计时，此后的t v -图象示意如图，下列判断正确的是（ ）A ．在1t 时刻a 、b 速度相等B ．0～1t 时间内，a 、b 间距离在减小C ．0～1t 时间内，a 位于b 、c 前面D ．1t 时刻以后，b 位于a 、c 前面答案：AC解析：根据图象可知，在1t 时刻a 、b 速度相等，故A 正确；0时刻两车同时经过公路旁的同一个路标，在时1t 间内a 车速度大于b 的速度，a 车在b 车的前方，所以两车逐渐远离，距离增大，故B 错误；0～1t 时间内，a 的位移最大，所以a 位于b 、c 前面，1t 时刻以后的一段时间内，a 位于b 、c 前面，故C 正确，D 错误。
8．如图所示，一根细线下端拴一个金属小球P ，细线的上端固定在金属块Q 上，Q 放在带小孔（小孔光滑）的水平桌面上，小球在某一水平面内做匀速圆周运动（圆锥摆）。
现使小球改到一个更高一些的水平面上做匀速圆周运动（图中P '位置），两次金属块Q 都静止在桌面上的同一点，则后一种情况与原来相比较，下面的判断中正确的是（ ）A ．细线所受的拉力变小B ．小球P 运动的角速度变小C ．Q 受到桌面的静摩擦力变大D ．Q 受到桌面的支持力变大答案：C解析：设细线与竖直方向的夹角为θ，细线的拉力大小为T ，细线的长度为L 。
P 球做匀速圆周运动时，由重力和细线的拉力的合力提供向心力，如图，则有：θcos mgT =，θωθsin tan 2L m mg =，得角速度θωcos L g =，周期ωπ2=T 。
使小球改到一个更高一些的水平面上做匀速圆周运动时，θ增大，θcos 减小，则得到细线拉力T 增大，角速度增大，周期T 减小。
对Q 球，由平衡条件得知，Q 受到桌面的静摩擦力变大，故A 、B 错误，C 正确；金属块Q 保持在桌面上静止，根据平衡条件得知，Q 受到桌面的支持力等于其重力，保持不变，故D 错误。
9.一个质量为m 的铁块以初速度1v 沿粗糙斜面上滑，经过一段时间又返回出发点，整个过程铁块速度随时间变化的图象如图所示，则下列说法正确的是（ ）A ．铁块上滑过程处于超重状态B ．铁块上滑过程与下滑过程的加速度方向相反C ．铁块上滑过程与下滑过程满足)(12211t t v t v -=D ．铁块上滑过程损失的机械能为2121mv答案：C解析：上滑过程匀减速上滑，加速度方向沿斜面向下，下滑过程匀加速下降则加速度方向沿斜面向下，故上滑和下滑过程加速度方向相同，物体都处于失重状态，故A 、B 错误；速度时间图象与坐标轴围成的面积表示位移，由图可知，上滑的位移为1121t v ，下滑的位移为)(21122t t v -，经过一段时间又返回出发点说明)(12211t t v t v -=，故C 正确；根据能量守恒知上滑损失机械能为mg t v mv mgh E E k 112112121-=-=∆，故D 错误。
10．2014年3月8日凌晨马航客机失联后，西安卫星测控中心紧急调动海洋、风云、高分、遥感4个型号近10颗卫星，为地面搜救提供技术支持。
特别是“高分一号”突破了空间分辨率、多光谱与大覆盖面积相结合的大量关键技术。
如图为“高分一号”与北斗导航系统两颗卫星在空中某一面内运动的示意图。
“北斗”系统中两颗卫星“1G ”和“3G ”以及“高分一号”均可认为绕地心O 做匀速圆周运动。
卫星“1G ”和“3G ”的轨道半径为r ，某时刻两颗工作卫星分别位于轨道上的A 、B 两位置，“高分一号”在C 位置。
若卫星均顺时针运行，地球表面处的重力加速度为g ，地球半径为R ，不计卫星间的相互作用力。
则下列说法正确的是（ ）A ．卫星“1G ”和“3G ”的加速度大小相等且为g rR B ．如果调动“高分一号”卫星快速到达B 位置的下方，必须对其加速 C ．卫星“1G ”由位置A 运动到位置B 所需的时间为3rrR gπD ．若“高分一号”所在高度处有稀薄气体，则运行一段时间后，机械能会增大 答案：C解析：根据万有引力提供向心力ma rmMG=2，得2r GM a =，而2gR GM =，所以卫星的加速度22rgR a =，故A 错误；“高分一号”卫星加速，将做离心运动，轨道半径变大，速度变小，路程变长，运动时间变长，故如果调动“高分一号”卫星快速到达B 位置的下方，必须对其减速，故B 错误；根据万有引力提供向心力rm r Mm G22ω=，得3r GM =ω，所以卫星1由位置A 运动到位置B 所需的时间grR r t 33πωπ==，故C 正确；“高分一号”是低轨道卫星，其所在高度有稀薄气体，克服阻力做功，机械能减小，故D 错误。
11．2014年5月10日天文爱好者迎来了“土星冲日”的美丽天象。
“土星冲日”是指土星和太阳正好分处地球的两侧，三者几乎成一条直线。
该天象每378天发生一次，土星和地球绕太阳公转的方向相同，公转轨迹都近似为圆，地球绕太阳公转周期和半径以及引力常量均已知，根据以上信息可求出（ ） A ．土星质量 B ．地球质量 C ．土星公转周期D ．土星和地球绕太阳公转速度之比答案：CD解析：行星受到的万有引力提供向心力，根据牛顿第二定律列方程后，行星的质量会约去，故无法求解行星的质量，A 、B 均错误；“土星冲日”天象每378天发生一次，即每经过378天地球多转动一圈，根据πππ2)22(21=-t T T 可以求解土星公转周期，C 正确；知道土星和地球绕太阳的公转周期之比，根据开普勒第三定律，可以求解转动半径之比，根据TRv π2=可以进一步求解土星和地球绕太阳公转速度之比，D 正确。