拔高训练5

九年级数学拓展练习班级 姓名 等第1. 如图在菱形ABCD 中，AB=BD ，点E ，F 分别在AB ，AD 上，且AE=DF ．连接BF 与DE 相交于点G ，连接CG 与BD 相交于点H ．下列结论： ①△AED≌△DFB； ②S 四边形 BCDG =43 CG 2； ③若AF=2DF ，则BG=6GF ．其中正确的结论有 ①②③ （填序号） 2.长为1，宽为a 的矩形纸片（121<<a ），如图那样折一下，剪下一个边长等于矩形宽度的正方形（称为第一次操作）；再把剩下的矩形如图那样折一下，剪下一个边长等于此时矩形宽度的正方形（称为第二次操作）；如此反复操作下去．若在第n 此操作后，剩下的矩形为正方形，则操作终止．当n=3时，a 的值为35或34． 3.如图，平面内4条直线L 1、L 2、L 3、L 4是一组平行线，相邻2条平行线间的距离都是1个单位长度，正方形ABCD 的4个顶点A 、B 、C 、D 都在这些平行线上，其中点Ａ、Ｃ分别在直线L 1和L 4上，该正方形的面积是 5或9 平方单位．4.在平面直角坐标系xoy 中，边长为a（a 为大于0的常数）的正方形ABCD 的对角线AC 、BD 相交于点P ，顶点A 在x 轴正半轴上运动，顶点B 在y 轴正半轴上运动（x 轴的正半轴、y 轴的正半轴都不包含原点O ），顶点C 、D 都在第一象限．(1)求证：无论点A 在x 轴正半轴上、点B 在y 轴正半轴上怎样运动，点P 都在∠AOB 的平分线上；（2）设点P 到x 轴的距离为h ，试确定h 的取值范围，并说明理由．解：（1）当∠BAO =45°时，∠PAO =90°，在Rt ⊿AOB 中，OA ＝22AB ＝a 22，在Rt ⊿APB 中，PA ＝22AB ＝a 22。

∴点P 的坐标为（a 22，a 22） （2）过点P 分别作x 轴、y 轴的垂线垂足分别为M 、N ，则有∠PMA =∠PNB =∠NPM =∠B PA =90°，∴∠MPA =∠14131211NPB ，又PA ＝PB ，∴△PAM ≌△PBN ，∴PM=PN ，于是，点P 都在∠AOB 的平分线上；（3）2a＜h ≤a 22。

工程问题拔高题训练1、甲、乙两队合作挖一条水渠要30天完成，若甲队先挖4天后，再由乙队单独挖16天，共挖了这条水渠的2/5．如果这条水渠由甲、乙两队单独挖，各需要多少天？甲做14天，乙做16天，可以看作甲乙合作4天，乙再单独完成16-4=12天甲乙合作4天完成：1/30×4=2/15乙12天完成：2/5-2/15=4/15乙的效率：4/15÷12=1/45 甲的效率：1/30-1/45=1/90甲单独完成的时间：1÷1/90=90（天）乙单独完成的时间：1÷1/45=45（天）2、甲、乙、丙三人生产一批玩具，甲生产的个数是乙、丙二人生产个数之和的1/2，乙生产的个数是甲、丙两人生产个数之和的1/3，丙生产了50个。

这批玩具共有多少个？甲占总数的1/3，乙占总数的1/4，丙占总数的1-1/3-1/4=5/12量率对应：50÷5/12=120（个）3、几个同学去割两块草地的草，甲地面积是乙地面积的4倍，开始他们一起在甲地割了半天，后来留下12人割甲地的草，其余人去割乙地的草，这样又割了半天，甲、乙两地的草同时割完了，问：共有多少名学生？解设共有x人，没人每天的割的草为1份0.5x+12×0.5 = (x-12)×0.5×4X=204、一批工人到甲、乙两个工地进行清理工作，甲工地的工作量是乙工地的工作量的3/2倍．上午去甲工地的人数是去乙工地人数的3倍，下午这批工人中有7/12的人去甲工地．其他工人到乙工地．到傍晚时，甲工地的工作已做完，乙工地的工作还需4名工人再做1天，那么这批工人有多少人？解设：这批工人有12x人9x×0.5+7x×0.5=3/2×(3x×0.5+5x×0.5+4)X=312×3=36(人)5、有两个同样的仓库，搬运完其中一个仓库的货物，甲需要6小时，乙需要7小时，丙需要14小时．甲、乙同时开始各搬运一个仓库的货物，开始时，丙先帮甲搬运，后来又去帮乙搬运，最后两个仓库的货物同时搬完．则丙帮甲多少小时？帮乙多少小时？可以看作甲乙丙三人都一直在合作，合作的工作量为：1+1=2合作的效率为：1/6+1/7+1/14=8/21合作的时间为：2÷8/21=21/4（小时）甲在第一个仓库完成的工作量：21/4×1/6=7/8丙帮助甲的工作量：1-7/8=1/8丙帮助甲的时间：1/8÷1/14=7/4（小时）丙帮助乙的时间：21/4-7/4=7/2（小时）6、搬运一个仓库的货物，甲需10小时，乙需12小时，丙需15小时．有同样的仓库A和B，甲在A仓库，乙在B 仓库同时开始搬运货物，丙开始帮甲搬运，中途又转向帮乙搬运，最后同时搬完两个仓库的货物．丙帮助甲、乙各搬运了几小时？可以看作甲乙丙三人都一直在合作，合作的工作量为：1+1=2合作的效率为：1/10+1/12+1/15=1/4合作的时间为：2÷1/4=8（小时）甲在第一个仓库完成的工作量：1/10×8=4/5丙帮助甲的工作量：1-4/5=1/5丙帮助甲的时间：1/5÷1/15=3（小时）丙帮助乙的时间：8-3=5（小时）7、甲、乙、丙三队要完成A，B两项工程，B工程的工作量是A工程工作量再增加1/4，如果让甲、乙、丙三队单独做，完成A工程所需要的时间分别是20天，24天，30天．现在让甲队做A工程，乙队做B工程，为了同时完成这两项工程，丙队先与乙队合做B工程若干天，然后再与甲队合做A工程若干天．问丙队与乙队合做了多少天？假设A的工作量为1，则B的工作量为5/4可以看作甲乙丙三人都一直在合作，合作的工作量为：1+5/4=9/4合作的效率为：1/20+1/24+1/30=1/8合作的时间为：9/4÷1/8=18（小时）甲在第一个仓库完成的工作量：1/20×18=9/10丙帮助甲的工作量：1-9/10=1/10丙帮助甲的时间：1/10÷1/30=3（小时）丙帮助乙的时间：18-3=15（小时）8、甲、乙、丙三人同时分别在3个条件和工作量相同的仓库工作，搬完货物甲用10小时，乙用12小时，丙用15小时．第二天三人又到两个大仓库工作，这两个仓库的工作量相同．甲在A仓库，乙在B仓库，丙先帮甲后帮乙，用了16个小时将两个仓库同时搬完．丙在A仓库搬了多长时间？可以看作甲乙丙三人都一直在合作，合作的工作效率为：1/10+1/12+1/15=1/4合作的工作量为：1/4×16=4A 和B仓库的工作量为：4÷2=2甲在A仓库完成的工作量为：1/10×16=8/5丙帮助甲完成的工作量为：2-8/5=2/5丙帮助甲的时间：2/5÷1/15=6（小时）9、一项工程，乙单独做要17天完成．如果第一天甲做，第二天乙做，这样交替轮流做，那么恰好用整天数完成；如果第一天乙做，第二天甲做，这样交替轮流做，那么比上次轮流的做法多用半天完工．问：甲单独做需要几天？情况1:甲乙甲乙甲乙......甲情况2:乙甲乙甲乙甲......乙甲前面的过程完全一样，最后的一点也一样则甲=乙+0.5甲甲=2乙甲的效率是乙的2倍，则甲的时间应该是乙的一半甲的时间：17÷2=8.5（天）10、一项工程，甲单独做要12小时完成，乙单独做要18小时完成．若甲先做1小时，然后乙接替甲做1小时，再由甲接替乙做1小时，……，两人如此交替工作，请问：完成任务时，共用了多少小时？每甲1小时和乙1小时看作一个小周期，一个小周期完成1/12+1/18=5/36需要的周期：1÷5/36=7个周期又1/5个周期7个完整的周期完成：5/36×7=35/36剩下的工作量：1-35/36=1/36此时甲还需要的时间：1/36÷1/12=1/3（小时）一共的时间：7×2+1/3=14又1/3个小时11、一件工程，甲独做要12小时完成，乙独做要15小时完成，丙独做要18小时完成，如果先由甲工作1小时，然后由乙接替甲工作1小时，再由丙接替乙工作1小时，再由甲接替丙工作1小时…三人如此交替工作，那么完成这工程时共用了多少小时？每甲1小时，乙1小时，丙1小时看作一个小周期，一个小周期完成1/12+1/15+1/18=37/180需要的周期：1÷37/180=4个周期又32/37个周期4个完整的周期完成：37/180×4=37/45剩下的工作量：1-37/45=8/45剩下的工作量，甲做完1小时后还剩：8/45-1/12=17/180乙再做1小时后还剩：17/180-1/15=1/36此时丙还需要的时间：1/36÷1/18=1/2（小时）一共的时间：4×3+1+1+1/2=14又1/2个小时12、规定两人轮流做一个工程，要求第一个人先做1个小时，第二个人接着做一个小时，然后再由第一个人做1个小时，然后又由第二个人做1个小时，如此反复，做完为止．如果甲、乙轮流做一个工程需要9.8小时，而乙、甲轮流做同样的工程只需要9.6小时，那乙单独做这个工程需要多少小时？情况1：甲1 乙1 甲1 乙1 甲1 乙1 甲1 乙1 甲1 乙（0.8）情况2：乙1 甲1 乙1 甲1 乙1 甲1 乙1 甲1 乙1 甲（0.6）前8个小时都是一样的，最后一点有不同甲1+乙0.8=乙1+甲0.6甲0.4=乙0.2乙=2甲乙的效率是甲的2倍甲做1小时，乙只用做0.5小时则乙一共用的时间：0.5×5+4+0.8=7.3（小时）13、一项工程，甲、乙合作63/5小时可以完成，若第1小时甲做，第2小时乙做，这样交替轮流做，恰好整数小时做完；若第1小时乙做，第2小时甲做，这样交替轮流做，比上次轮流做要多1/3小时，那么这项工作由甲单独做，要用多少小时才能完成？情况1:甲乙甲乙甲乙......甲1情况2:乙甲乙甲乙甲......乙1甲（1/3）前面的过程完全一样，完成的工作量一样，只是最后一点不同甲1=乙1+甲1/32甲=3乙假设甲的工效为3份，乙的工效为2份，则工作总量为（2+3）×63/5=63（份）甲单独做的时间：63÷3=21（小时）。

五年级解方程应用题拔高训练
1.同学们去参加"科普图片展"，六年级去了248人，比五年级的2倍少2人．五年级去了多少人？
2.小刚买回8角钱邮票和1元2角的邮票共17张，问小刚一共用多少钱买邮票？
3.一个长方形的周长是20厘米，长是a厘米，则宽是( )厘米．
4.甲数是30，比乙数少20%，乙数是多少．
5.一个数的(3/5)比1.2的1(1/4)倍多2.15，这个数是多少？
6.某水泥厂去年生产水泥232400吨，今年头5个月的产量就等于去年全年的产量．照这样计算，这个水泥厂今年将比去年增产百分之几？
7.某电视机厂所属的两个分厂共同组装一批彩电．第一个分厂组装的数量是两个分厂组装总数的45%，这时，比第二个分厂少组装了40台．两个分厂共组装了多少台彩电？
8.一项工程，甲单独做15天完成，乙单独做10天完成．如果甲先做了这项工程的(1/3)，剩下的由甲、乙合做，还要几天才能完成？
9.一辆汽车从甲地开往乙地，每小时行40千米，返回时因是上坡路，每小时行30千米．结果返回时比去时多用了1小时．求甲、乙两地间的路程？
10.一条公路全长60千米，分成上坡、平路、下坡三段，各段路程长的比依次是1：2：3，张老师走各段路程所用的时间比依次是4：5：6，已知张老师上坡的速度是每小时3千米，问：张老师走完全程用了多少时间？。

新目标八年级上册英语Unit5知识拔高训练试题及答案一、根据首字母及汉语意思补全单词（15分）1.They are going to the cinema to see anEnglish f this evening.2. He joined the a and became a solider(士兵)two years ago.3. —Would you(介意)my turning on the TV? —Not at all.4. No one knows what will(发生)tomorrow.5. Chinese tea(文化)has a long history.6.I _______(希望) to meet my good friend soon.7．Do your parents watch ________(新闻) every evening?8．The story ________(发生) about five hundred years ago.9．It ________(可能) take us half an hour to get to the train station.10．John always makes fun of me and I can't ________(忍受) him.11. I h that I can be good at all the subjects.12. What is h between the girls and the boys?--- They are quarrelling.13. Most of the parents e much of their children.14. We must try our best to make the Food Festival s .15. He is a disabled person, so he can just do some s work.二、用方框内所给单词或短语的适当形式填空（10分）1.My grandfather likes wearing fashionable clothes. He what young people think of him.2.The old men rock music. They think it’s too noisy.3.Her sister soap operas. She likes them very much.4.I to go shopping with my mother. It’s crowded in the store.三、完成句子（10分）1.最后老奶奶弄清了孩子们的数目。

2023年新高考英语二轮拔高班复习资料阅读理解训练题型：说明文题组训练（五）姓名：班级：学校：错题号：（2022·福建厦门·校联考模拟预测）Our planet is home to many radioactive substances-not just in is geologic innards but also in its hospitals, at its industrial sites and in its food processing plants. In Colorado, for instance, 27 buildings house scary-sounding chemical elements such as cesium 137 and cobalt 60. These materials are not there for risky purposes, though. They play a part in cancer treatment, blood irradiation, medical and food sterilization, structure and equipment testing, geologic exploration, etc.The radioactive material is not always bad in a black and-white way: it can be a useful tool. The rays given off by cesium and cobalt can kill germs multiplying in your meat and make your apples last longer. Radiographic instruments can detect, say, cracks in a city’s pipes in a similar way to an x-ray picking up a hairline fracture in your knee. A practice called “well logging”uses sealed radioactive sources to map the geology of holes oil seekers drill into the earth. And of course, radiation is key to cancer treatment.The risk arises because the same radioactive material that is beneficial could also be stolen or misplaced and find its way into trafficking rings or dirty bombs. It might also barn workers if something accidentally goes wrong during a normal nine-to-five day. In 2017 alone, according to a report from the James Martin Center for Nonproliferation Studies, there were 171 “incidents of nuclear or other radioactive materials outside of regulatory control”based on open source reports, 104 of which happened in the U.S.An initiative called RadSecure 100 was launched to remove and better secure energetic material in 100 U.S. cities. “Where is the most high-risk material located around the most people?”says Emily Adams, deputy director of a domestic program in the Office of Radiological Security. “And that’s how we got our 100.”1．What message does the author seem to convey in paragraph 1?A．Radioactive substances can warm our planet.B．Food processing does harm to workers in plants.C．The radioactive material is basically everywhere.D．It’s hard to remove scary-sounding elements in buildings.2．Why does the author mention “well logging”in paragraph 2?A．To make a summary. B．To raise a question.C．To provide a contrast. D．To support an idea.3．What is RadSecure 100 intended for?A．Making use of energetic substances. B．Ensuring safety of the radioactive material.C．Warning people of the most high-risk material D．Protecting the Office of Radiological Security.4．What is the writer’s attitude towards the radioactive material?A．Pessimistic. B．Objective. C．Disapproval. D．Carefree.（2022·重庆·校联考二模）A new study has found that water in the air, not just heat, is important in measuring global warming. The researchers say, when considering humidity and heat, the temperature increase is two times greater than earlier estimates.The researchers also note, temperature by itself is not the best way to measure the effects of climate change and using temperature underestimates conditions in the tropicalareas of the world.The study was published on January 31 in Proceedings of the National Academy of Sciences. The researchers team show that the energy created in extreme weather, such as storms, is related to the amount of water in the air. For this reason, they decided to use a special atmospheric measurement to show the amount of heat in an area of air. It is expressed in a scientific measurement for temperature known as degrees Kelvin.Ramanathan is one of the writers of the study. He is a climate scientist at the University of California San Diego’s Scripps Institution of Oceanography. “There are two factors of climate change: temperature and humidity. And so far, we have measured global warming just in terms of temperature,”he says. “Warm air can hold more water than cold air. For every degree Celsius that air temperature increases, it can hold seven percent more water. When the water vapor in the air becomes liquid, it releases heat or energy. That’s why when it rains, now it pours.”Ramanathan added that water vapor is a powerful heat-trapping gas in the atmosphere that increases climate change. From 1980 to 2019, the average world surface air temperature increased by 0.79 degrees Celsius. But when they considered energy from humidity, their temperature measurement had increased by 1.48 degrees Celsius. In the tropics, the warming was as much as 4 degrees Celsius.Wuebbles is a climate scientist at the University of Illinois. He was not part of the study. But Wuebbles said the idea makes sense because water vapor is important in extreme rainfall. He said, “Both heat and humidity are important.”5．Which of the following statements is TRUE according to the passage?A．The combination of water and heat decreases average surface temperature.B．The reason why it pours is that cold air can hold more water than warm air.C．Scientists adopt temperature degrees Kelvin as a special atmospheric measurement.D．Scientists used both temperature and humidity to measure global warming in the past.6．How does Ramanathan illustrate his findings in the fifth paragraph?A．By making comparisons. B．By taking examples.C．By analyzing reasons. D．By giving definitions.7．What is Wuebbles’attitude to this new study?A．Critical. B．Objective. C．Skeptical. D．Appreciative.8．Which of the following may be the best title for the passage?A．Extreme Weathers Are Closely Related to Air Heat AmountB．A New Study Focuses on Global Warming SolutionsC．Humidity Is Also Important in Measuring Climate ChangesD．Two Climate Scientists Develop a Scientific Method（2022·湖南郴州·统考一模）Shawanee Patrick is passionate about giving everyone the ability to walk as comfortably and effectively as possible through the use of walking assistive devices, such as prosthetics (假肢) and orthotics. A Ph.D．student in the J. Mike walker 66 Department of Mechanical Engineering at Texas A&M University, Patrick was inspired to help develop better walking assistive devices by the partial paralysis (瘫痪) of her grandmother.Her research focuses on developing and improving walking assistive devices by determining what inputs are important and outcomes that could improve the design process. “I like to say my research is about how to help people who can’t walk be able to walk, and how to help those who do walk. Walk better.”Patrick said. “That’s kind of my aim.Walking improves the quality of life, so it’s really important we help those facing challenges when we can.”The COVID-19 pandemic brought challenges to Patrick’s research as well. Patrick’s research—which works with human studies—had been delayed several times by the health and availability of her subjects. Patrick said the process of conducting her research includes investigating the user’s needs from various angles. From the perspective of the user themselves to their physician and family members, Patrick said it is necessary to build a complete picture of them.Patrick is determined to make a positive impact on the lives of the people she works with. as well as the thousands more like them. Although the specific project she is working on will not be going to market. Patrick said she is hopeful that the research she is conducting could one day influence the development of a product that makes its way to those who could greatly benefit from the support.9．What inspired Patrick to start the project?A．Her strong desire to help the old.B．Her grandmother’s disability.C．Her assignment in university.D．Her enthusiasm about mechanical engineering.10．What is the purpose of Patrick’s research?A．To figure out the facts about inputs.B．To cope with the important challenges.C．To improve the lives of those in need.D．To perfect the design process.11．What was the necessary step when Patrick conducted the research?A．Fully understand the users’demands.B．Remove the C0VID-19 pandemic.C．Investigate the users’health and availability.D．Contact the users’physician and family members.12．Which of the following can be the best title for the text?A．How to walk Better.B．A Cure for Painful Patients.C．A New walking Device.D．A Helpful Project Launched by A student.（2022·广东肇庆·肇庆市第一中学校考一模）Final exams are around the comer —but that won’t stop some teenagers putting in the least effort. This may be because their brains aren’t developed enough to properly assess how high the stakes (利害关系) are, and adapt their behaviour accordingly.Catherine Insel, at Harvard University, and her team asked adolescents between the ages of 13 and 20 to play a game while monitoring their brains. In some rounds of the game,participants could earn 20 cents fora correct response, while an incorrect one would cost them 10 cents. But in rounds with higher stakes,correct responses were worth a dollar, and wrong answers lost the participants 50 cents.The team found that while the older volunteers performed better in the high stakes rounds, the younger ones didn’t —their performance didn’t change in line with whether the stakes were low or high. And the older the volunteers were, the more improved their performance was.When the team looked at the brain activity of the volunteers,they found that their ability to improve their performance was linked to how developed their brains were. A region in the brain, which continues to develop until we are at least 25 years old, seemed to be particularly important. The findings explain why some teenagers are so unconcerned when it comes to hazardous behaviors, such as driving too fast, for instance, especially when one of their friends is nearby.Insel thinks schools should reconsider the way they test performance in teenagers. “This study suggests it’s not a good idea to evaluate school performance in a single final exam”, she says. A better idea would be to use a variety of smaller tests, conducted throughout the year.It’s not all bad news for teens, though. Teenagers put the same amount of effort into tasks that aren’t “important”, and start to prefer hobbies to school. It could be a good thing, allowing teenagers to learn complex social skills, for example.13．Why did the researchers set different bets in the game?A．To teach how to make money.B．To better monitor participants’brains.C．To show the varied risk levels of the game.D．To meet the needs of different participants.14．What does the underlined word “hazardous”probably mean?A．Dangerous. B．Abusive.C．Specific. D．Addictive.15．What should be kept in mind while assessing students’performance?A．It should not be judged by only one exam.B．The items in exams should not be too difficult.C．Exam-focused education should not be adopted.D．Examination is not a good means of evaluating students.16．What is Insel’s attitude to teenagers’putting effort into “unimportant”tasks?A．Unclear. B．Favorable. C．Doubtful. D．Negative.（2022·江苏徐州·徐州市第七中学校考模拟预测）Have you ever wondered what the food you eat every day can tell you about where you come from? Have you ever wondered why people from different parts of the world eat different types of food? Do you ever ask yourself why certain foods or culinary (烹饪的) traditions are so important to your culture? There is more of a connection between food and culture than you may think.On an individual level, we grow up eating the food of our cultures. It becomes a part of who each of us is. Many of us associate food from our childhood with warm feelings and good memories and it ties us to our families, holding a special and personal value for us.On a larger scale, food is an important part of culture. Traditional cuisine is passed down from one generation to the next. It also operates as an expression of cultural identity. Immigrants bring the food of their countries with them wherever they go and cooking traditional food is a way of preserving their culture when they move to new places.In China, harmony is a vital quality in almost every aspect of life. This is reflected in Chinese cuisine, where almost every flavor is used in a balanced way creating delicious dishes with flavors that go well together. The cuisine of the United States also reflects its history. The European colonization of the Americas brought European ingredients and cooking styles to the U.S.As the world becomes more globalized, it is easier to access cuisines from different cultures. We should embrace our heritage(传统)through our culture's food but we should also become more informed about other cultures by trying their foods. It's important to remember that each dish has a special place in the culture to which it belongs, and is specialto those who prepare it.17．What does the author want to express in Paragraph 1?A．A link between food and culture.B．Connections between food and the growth of people.C．Different types of food.D．Concerns about food and culture.18．What does the underlined word "It" in Paragraph 3 refer to?A．Traditional food. B．Traditional culture.C．One generation. D．Childhood.19．How do people feel about Chinese food?A．It is rich in all kinds of vitamins.B．It balances the dishes of different countries.C．It is extremely crucial to balance people's daily life.D．It contains abundant dishes with various flavors.20．What can we learn about food from this passage?A．It binds us to the society, holding a special and personal value for us.B．The European colonist in Americas brought the ingredients and cooking styles from their hometown to the USA．C．In Chinese culture, harmony in cuisine is of little significance. D．We should refuse the cuisines in other cultures.参考答案1．C 2．D 3．B 4．B5．C 6．A 7．D 8．C9．B 10．C 11．A 12．D 13．C 14．A 15．A 16．B 17．A 18．A 19．D 20．B。

小学五年级上册数学拔高练习题（一）一、填空。

(15分)1、13.5×0.5表示( )。

2、13.5÷0.5表示( )。

3、用字母表示平行四边形的面积公式是（）。

4、计算0.756÷0.18，先把被除数和除数同时扩大相同倍数，将除数转化为整数，变成（）÷（）再计算。

5、在○里填上＞、＜或＝。

19.7×2.6○19.7 36×0.5○36÷2 35.6○35.6÷0.256、1200平方米＝（）公顷 5.2吨＝（）吨（）千克1.05米＝（）厘米7、一个三角形的底是3分米，高为 1.2分米，面积是（）。

8、甲、乙两辆客车同时从安阳开往郑州，甲车每小时行60千米，乙车每小时行65千米。

经过1.5小时两车相距多少千米？这道题可以先求（），再求相距多少千米，列出综合算式是（），也可以先求（）,再求相距多少千米。

二判断。

在正确说法的后边（）里打“√”，错误说法后边的（）里打“×”。

（4分）1、三角形面积是平行四边形面积的一半。

（）2、2.5×4.4可以这样简单的计算：2.5×4×0.4。

（）3、5.32727…….可写作5.327。

（）4、两个相等的梯形可以拼成一个平行四边形。

（）三选择。

把正确答案的序号添在（）里。

（3分）1、3.14×102的正确的简便计算方法是（）。

①3.41×100×2 ②3.14×100+2 ③3.14×100+3.14×22、食堂运来10吨煤，计划烧40天。

由于改进炉灶，每天节省5千克。

这批煤现在可以烧多少天？正确的列式为：（）。

①10÷(10÷40-5) ②10000÷（10000 ÷40－5）③1000÷（40－5）3、一个三角形的底扩大5倍，高扩大5倍，面积（）。

第5章金属拔高训练 (满分30) 姓名 得分一、单选题（每小题2分，共18分）1、芜湖铁画是中国工艺美术百花园中的一朵奇葩。

它以钢材为主料，经锻打、焊接、酸洗、上漆等多道工艺制成。

下列关于铁画的叙述不正确的是（ ）(A)铁画应悬挂在干燥的环境中(B)所用材料上的铁锈可用稀盐酸清洗掉(C)给打制成型的铁画喷漆既美观又可以防锈蚀(D)所用的主要材料——低碳钢，有较好的锻轧性能，它不属于铁的合金2、取3枚洁净无锈的铁钉，分别加入3支试管如图所示的物质进行实验，试管中铁钉锈蚀速度由快到慢的顺序为（ ）A ．①②③B ．②①③C ．②③①D ．③①②3、下列对金属和金属材料的认识中，错误．．的是( )： A.生铁和钢的性能完全相同 B.铁粉作双吸剂和铁生锈的原理相同C.赤铁矿的主要成分是Fe 2O 3D.回收废旧金属有利于节约金属资源4、下列能源中，不会对环境造成污染且取之不尽的是（ ）A ．太阳能B ．煤C ．石油D ．天然气5、物质的性质决定物质的用途，下列说法不正确的是（ ）A ．氧气可用于金属切割，因为氧气能支持燃烧B ．氧化钙能做干燥剂，因为氧化钙有吸水性C ．“银粉漆”（铝粉）可涂在铁栏杆上防锈，因为铝的化学性质稳定D ．熟石灰可用来砌砖抹墙，因为氢氧化钙能吸收空气中的二氧化碳生成碳酸钙的缘故6、将一些锌粉加入硝酸银、硝酸铜的混合溶液中，完全反应后过滤。

下列说法正确的是( )A ．滤液中一定不含硝酸银，滤纸上一定不含锌，一定不含铜B ．滤液中一定含有硝酸锌，滤纸上一定含有银，可能含有铜C ．滤液中可能含硝酸锌，滤纸上可能含有铜，也可能含有锌D ．滤液中一定含有硝酸银，滤纸上一定含有铜，一定含有锌7、将等质量的镁、铁、锌，分别放入三份溶质质量分数相同的稀盐酸中，反应生成的H2质量与反应时间的关系如图所示。

根据图中的信息，作出的判断不正确的是( )A ．图线x 表示镁的反应情况B ．铁消耗的稀盐酸质量最大C ．镁、锌一定过量，铁可能反应完D ．镁一定过量，锌、铁可能反应完8、与保护金属资源有效途径不相符的是( )A 、废旧金属的回收B 、防止金属的锈蚀C 、寻找金属代用品D 、合理开采化石能源9、等质量的稀硫酸分别与足量的镁、铁、锌三种金属反应，下列图像能正确表示产生氢气的质量与反应时间关系的是( )二、实验探究题(每空1分，共6分)l0、某化学兴趣小组的同学对一瓶久置的熟石灰粉末的组成进行实验探究，请你 一起参与他们的探究活动。

苏教版四年级下册第七单元拔高训练认识三角形1．下面是三角形的画“√”，不是的画“×”。

2．用小棒和钉子做一个三角形木框。

（1）至少要用（）根小棒，因为三角形有（）条边。

（2）至少要用（）颗钉子，因为三角形有（）个顶点。

3．画出每个三角形指定底边上的高。

4．下图中每个小方格的边长都表示1厘米。

（1）图中所画三角形的底是（）厘米，对应的高是（）厘米。

（2）分别以图中所给的线段为底，画出高是4厘米的三角形。

（3）在方格纸上任意找三个格点，将这三个格点顺次相连，首尾相接，一定能连成一个三角形吗？请说明理由。

5．判一判。

（1）由3条线段组成的图形叫作三角形。

（）（2）任意三角形都有3条边、3条高。

（）（3）三角形的高一定比边短。

（）6．李爷爷有一块三角形菜地，他想过三角形菜地的一个顶点到对边接一根水管灌溉菜地，要使水管的长度最短，这根水管应怎样安装？画一画。

7．下面图中各有几个三角形？8．下面两条平行线之间的距离是2厘米，利用下面的平行线按要求画图。

（1）以AB为底画两个不同的三角形。

要求画出的三角形的顶点（点A、B除外）都在另一条直线上。

（2）画出的三角形，AB边上的高都是（）厘米。

9．平面上有10个点，并且其中任意3个点都不在同一条直线上。

这10个点一共可以连成多少个三角形？三角形的三边关系1．选一选。

（1）有两根小棒，一根长8厘米，另一根长15厘米。

张明准备再用一根小棒与它们围成一个三角形，张明用的小棒的长度可能是（）厘米。

A.18B.7C.24（2）下面三种长度的线段，不能围成一个三角形的是（）。

A.4厘米、6厘米、12厘米B.3厘米、4厘米、5厘米C.7厘米、8厘米、9厘米（3）用三根小棒可以围成一个三角形的是（）A.①②③B.①③④C.②③④2．两根小棒，长度分别为7厘米和10厘米。

要想拼成一个三角形，那么第三根小棒的长度可以是多少厘米？（长度为整厘米数）3．有5根木条，它们的长度分别是1厘米、2厘米、3厘米、4厘米、5厘米，从它们当中选出3根木条围成一个三角形。

2019-2020学年度高中语文必修一[5 荆轲刺秦王]人教版拔高训练[含答案解析]第二篇第1题【单选题】下列句子中，划线虚词的意义和用法不相同的一项是( )A、令乃秦武阳为副荆轲废，乃引其匕首提秦王B、私见张良，具告以事夏无且以其所奉药囊提轲C、君之所知也臣之壮也，犹不如人D、轲自知事不就，倚柱而笑秦王还柱而走【答案】：【解析】：第2题【单选题】下列各组句子中，划线的词的意义和用法相同的一组是( )A、秦贪，负其强，以空言求璧臣诚恐见欺于王而负赵B、秦王恐其破壁，乃辞谢乃谢客就车C、相如虽驽，独畏廉将军哉莫敢难，独窦婴争之D、而蔺相如徒以口舌为劳徒以吾两人在也【答案】：【解析】：第3题【单选题】下列句子中，划线词的含义与现代相同的一项是( )A、今行而无信，则秦未可亲也B、樊将军仰天太息流涕曰C、此臣日夜切齿拊心也D、樊将军以穷困来归丹【解析】：第4题【单选题】下列各组词语中，划线的字注音全都正确的一项是( )A、骨髓（suǐ）城邑（yí）赠遗（wèi）燕太子（yān）B、流涕（tì）唱和（hé）自刎（wěn）樊於期（wū）C、诀别（jué）震慑（shè）蛮夷（mán）中庶子（shù）D、约契（qiè）嬴政（yíng）劫持（jié）夏无且（jū）【答案】：【解析】：第5题【单选题】下列名句默写有误的项是( )A、谨庠序之教，申之以孝悌之义，颁白者不负戴于道路矣。

（孟子《寡人之于国也》）B、耳得之而为声，目遇之而成色，取之无尽，用之不竭。

（苏轼《赤壁赋》）C、江间波浪连天涌，塞上风云接地阴。

（杜甫《秋兴》）D、倩何人唤取，红巾翠袖，揾英雄泪？（辛弃疾《水龙吟登建康赏心亭》）【答案】：第6题【问答题】读《荆轲刺秦王》，易水诀别一段的描写烘托了怎样的气氛，其中的音乐描写有什么作用。

【答案】：【解析】：第7题【语言表达】以故荆轲逐秦王，而卒惶急无以击轲，而乃以手共搏之。

Unit5 Do you have a soccer ball ?单元拔高训练一、用所给词的正确形式填空(每小题1分，共10分)1．My sister ______(not have)a soccer ball.2．Bruce only ______(watch)sports on TV!3．Michael ______(have)a computer.4．Let's ______(go)to play soccer.5．Does your father ______(play)sports every day?6．Where ______(be)your books?7．That ______(sound)fun.8．We can see some ______(basketball)in the classroom. 9．Please take ______(they)to your English teacher.10．—Is that your book?—Let ______(I)see.二、单项选择(每小题1分，共15分)1．—Does Jack______ a TV?—Yes. He often ______sports programs on______ TV.A．has；watches；/B．have；watches；/ C．have；watches；the D．has；watches；the 2．—______you have soccer balls?—Yes，I do. And I have two baseballs.A．Does B．AreC．Do D．Can3．—Let’s watch TV.—______.A．Sorry，I don’t B．That’s a good idea C．Yes，I do D．No，I don’t 4．—What are the girls doing?—They are playing______ basketball now.A．a B．anC．the D．/5．______Bill ______two ping-pong balls?A．Do；have B．Does；haveC．Do；has D．Does；has 6．—Where’s Mary?—Sorry，I______.A．not know B．am not knowC．don’t know D．know not7．Peter’s father often watches basketball games ______TV.A．in B．on C．at D．of 8．—Do you have a TV?—______A．Yes，it is. B．Yes，we are.C．Yes，we have. D．Yes，we do.9．—Your English is very good.—______.A．You’re right B．Thank youC．You are OK D．Don’t say so 10．—Let’s play computer games.—That ______ good.A．looks B．watchesC．sounds D．listens to11．The music(音乐)is______.I like it.A．well B．relaxingC．boring D．bad12．There are five people in a ______team.A．basketball B．baseballC．volleyball D．soccer ball13．We need one ping-pong ball and two ______.A．ping-pongs bats B．ping-pongs batC．ping-pong bats D．ping-pong bat14．The question is not easy. It’s very ______.A．difficult B．difficultyC．relaxing D．not difficult15．Mr.Black doesn’t like the lecture(演讲)．It is ______.A．interesting B．boringC．fun D．relaxing三、完形填空(每小题2分，共20分)Hello！I’m__1__.I’m an English boy.I__2__two sisters.__3__are Sonia and Linda.Sonia has a great sports collection.She has a soccer ball，three volleyballs __4__four basketballs.But she__5__ play sports—she only__6__ them on TV.Linda has a sports collection，__7__.She has two tennis balls and__8__ baseball.And she has many ping-pong balls__9__her schoolbag(抽屉)．She__10__ ping-pong every day.1．A.Lucy B．Alan C．Sonia D．Lily2．A.have B．do C．has D．does3．A.He B．She C．They D．It4．A.and B．but C．to D．of5．A.isn’t B．aren’t C．don’t D．doesn’t6．A.look B．watch C．looks D．watches7．A.please B．too C．there D．here8．A.three B．two C．a D．an9．A.with B．of C．on D．in10．A.plays B．play C．sound D．needs四、阅读理解(每小题2分，共30分)AMy friend Jane is a sports fan(爱好者)．She has a great sports collection.She has three soccer balls，five baseballs，six volleyballs and two basketball s.They are all under her bed.Jane plays basketball very well.She likes Kobe.She thinks he is the best(最好的)basketball player in America.Jane plays baseball very well，too.Now sheis in her school baseball club.1．Jane has ______ volleyballs.A．six B．five C．three D．ten2．Kobe is a ______.A．student B．basketball playerC．teacher D．baseball player3．Jane plays ______ very well.A．soccer and basketball B．volleyball and baseballC．basketball and baseball D．tennis and basketball4．Jane is ______.A．in her school basketball club B．an English teacherC．a sports fan D．Kobe’s sister5．We can find ______ under Jane’s bed.A．some notebooks B．a watchC．three books D．a great sports collectionBI have three good friends. We like sports very much. My favorite sport is basketball. I have three balls. I think playing basketball is interesting. Jim and Tim think it is boring to play basketball. Their favorite sport is soccer. They play soccer every afternoon. They have four balls. Mary is a nice girl. Her favorite sport is volleyball. She plays it very well. It’s relaxing for her to play volleyball. But she has only one ball. Sports are good for us.6．What’s Jim and Tim’s favorite sport?A．Basketball. B．Soccer.C．Volleyball. D．Baseball.7．What’s Mary’s favorite sport?A．Soccer. B．Volleyball.C．Basketball. D．Baseball.8．Who has only one ball?A．I. B．Mary. C．Tim. D．Jim.9．Does Mary think it’s boring to play soccer?A．Yes，she does. B．No，she doesn’t.C．We don’t know. D．No，she don’t10．How many balls do I have?A．Two. B．Four. C．One. D．Three.CJohn Smith doesn’t play sports. He has two children. His son，Jim，likes tennis and soccer. And he has a sports collection.(A)He is in the school tennis club.(B)He plays tennis with his friends every day. Cindy，his daughter，likes baseball and tennis.(C) She only watches them on TV.根据短文内容，完成下列任务。