第十二次课讲义(含解题思路)
历年真题实战技巧(13)
2006年卫生类C
Sleepwalking (梦游)
Not all sleep is the same every night. We experience some deep, quiet sleep and some active sleep, which is when dreams happen. You might think sleepwalking would happen during active sleep, but a person isn't physically active during active sleep. Sleepwalking usually happens in the first few hours of sleep in the stage called slow-wave or deep sleep.
Not all sleepwalkers actually walk. Some simply sit up or stand in bed or act like
they're awake when in fact, they're asleep! Most, however, do get up and move around for a few seconds or for as long as half an hour.
Sleepwalkers' eyes are open, but they don't see the same way they do when they're awake and often think they're in different rooms of the house or different places altogether'. Sleepwalkers tend to go back to bed on their own and they won't remember it in the morning.
Researchers estimate that about 15% of kids sleepwalk regularly. Sleepwalking may run in families (在家族中世代相传) and sometimes occurs when a person is sick, has a fever, is not getting enough sleep, or is stressed (紧张).
If sleepwalk ing occurs frequently, every night or so, it's a good idea for your mom or dad to take you to see your doctor. But occasional sleepwalking generally isn't something to worry about, although it may look funny or even scary (骇人的) for the people who see a sleepwalker in action.
Although occasional sleepwalking isn't a big deal, it's important, of course, that the person is kept safe. Precautions (预防措施) should be taken so the person is less likely to fall down, run into something, or walk out the front door while sleepwalking.
解题思路
文章标题——“梦游”。由于标题很短,信息量不足,故尽量多读些与中心有关的内容,“but”所在句子意思——“你可能认为梦游发生在睡眠活跃期,但是,一个人的睡眠活跃期并不意味着身体也活跃”
31.When does sleepwalking usually occur?
A During active sleep,
B During deep sleep.
C In the daytime.
D In the early morning.
解题思路
32.What most sleepwalkers do is
A simply sit up.
B simply stand in bed.
C get up and walk for some time
D get up and walk for hours
解题思路
33.Sleepwalkers usually go back to bed
A. after waking up.
B. after being woken up.
C . with the help of others.
D. by themselves.
解题思路
34.You'd better go and see a doctor if you A.see a sleepwalker in action.
B.never sleepwalk,
C.sleepwalk frequently.
D.sleepwalk occasionally
解题思路
35.Measures措施should be taken to
A keep sleepwalkers safe.
B prevent people from sleepwalking
C avoid running into sleepwalkers.
D help people sleep well.
解题思路
历年真题实战技巧(14)2005年理工类B
Almost 差不多Human人类
Scientists are racing竞赛to build the world?s first thinking robot.This is not science fiction:some say they will have made制造it by截止the year 2020 Carol Packer reports Machines that walk,speak and feel are no longer science fiction.Kismet is the name of an android(机器人)which scientists have built at the Massachusetts Institute of Technology(MIT).Kismet is different from the traditional robot because it Can show human emotions情感.Its eyes,ears and lips move to show when it feels happy. sad or bored.Kismet is one of the first of a new generation of androids——robots机器人that look like human beings——which Can imitate human feelings.Cog,another android invented by the MIT, imitates the action 行动of a mother.However, scientists admit that So far Cog has the mental ability of a two—year—old.
The optimists(乐观主义者)say that by the year 2020we will have created humanoids(机器人)with brains similar to those of all adult human being.These robots will be designed to look like people to make them more attractive and easier to sell to the public.What kind of jobs will they do? In the future,robots like Robonaut,a humanoid invented by NASA,will be doing dangerous jobs,like repairing修理space stations.They will also be doing more and mom of the household work for us In Japan,scientists are designing androids that will entertain us by dancing and playing the piano.Some people worry about what the future holds:will robots become monsters(怪物)?Will people themselves become increasingly like robots? Experts predict that more and more people will be wearing micro—computers,connected to the Internet,in the future.People will have micro—chips in various parts of their body,which will connect them to a wide variety of gadgets (小装置).Perhaps we should not exaggerate(夸大)the importance of technology,but one wonders whether,in years to come,we will still be falling in love,and whether we will still feel pain.Who knows?
解题思路
文章标题——“差不多是人类”。找出中心句标志词,读出中心句后,发现,这是一篇说明机器人的文章。
31 Kismet is different from traditional robots because
A it thinks for itself
B it is not like science fiction
C it can look after two—year-old.
D it seems to have human feelings情感.
解题思路
32 What makes Cog special?
A It looks like a mother.
B It behaves like a child.
C It can imitate the behavior 行为of a mother.
D It has a huge brain.
解题思路
33 In about 15 years’ time from now,robots
A will become space designers.
B will look like monsters.
C will behave like animals.
D will think like humans.解题思路
34 In the future robots will also
A explore探索space.
B entertain people.
C move much faster.
D do a11 of the housework.
解题思路
35 What is the writer?s attitude to robots in the future?
A Critical
B Hostile不友善的
C Objective
D Enthusiastic热情的
解题思路
历年真题实战技巧(15)
2005年卫生类B
US States国家Do Poorly不好的in Women's Health女性健康Not a single US state meets basic federal goals for women's health,and the nation as a whole全部fails失败except in two area s—mammograms(乳腺x光照片)and dental(牙齿的) check-ups—researchers said on Thursday
Millions of women lack health insurance,and states make it difficult to enroll(加八)in Medicaid—the state-federal health insurance plan for the poor,according to the report.And few states are doing anywhere near enough to help women quit smoking——the leading cause of death in the United States
“The nation as a whole and the individual states fall short of meeting national goals,”reads the report.put together by the National Women's Law Center and the Oregon Health&Science University.“These health goals provide a road map for assessing the status of women's health.”
Of 27 measures examined by the group,from screening for diseases to actually treating them.the nation passes on only two,the researchers said“The nation is so far from the health goals that it receives an overall grade of…unsatisfactory?,”they wrote.
The problem seems to be a lack among states of an overall plan for health in general,the NWLC said.
“State policy makers' piecemeal approach to our health care crisis has resulted in a complex and ineffective system that fails失败to meet the health care needs of women," Judy Waxman NWLC Vice President for Health,said in a statement.
“Lawmakers need t o take a comprehensive,long-term approach to meeting women…s health needs and tackle this serious problem that troubles so many families.”
解题思路
文章标题——“美国对女性健康问题做的不够好”。中心句——除了女性健康问题的解决中,除了两个领域,其它都失败了。
31 In which area is the nation successful?
A Dental check-ups.
B Health promotion.
C Disease screening
D Cancer treatment.
解题思路
32 Medicaid is a program aimed at helping
A women.
B the poor.
C the old
D children
解题思路
33 Which is America's number one killer?
A Stress
B Heart disease
C Cancer
D Smoking
解题思路
34 The national goals for women's health make it easier to
A meet women's health needs
B assess the status of women's health.
C solve women's health problems
D deal with the health care crisis
解题思路
35 Which approach was recommended推荐by Judy Waxman?
A The piecemeal零碎的approach
B A state-federal approach
C A comprehensive综合的,long—term长期的approach.
D A complex复杂的approach.
解题思路
历年真题实战技巧(16)
2004年理工A
Technology技术Transfer转让in Germany德国
When it comes to translating basic research into industrial success, few几乎没有nations 国家can match赶上Germany. Since the 1940s, the nation?s vast industrial base has been fed with a constant stream of new ideas and expertise from science. And though German
prosperity(繁荣) has faltered (衰退) over the past decade because of the huge cost of unifying east and west as well as the global economic decline, it still has an enviable (令人羡慕的) record for turning ideas into profit.
Much of the reason for that success is the Fraunhofer Society, a network ok research institutes that exists solely to solve industrial problems and create sought-after technologies. But today the Fraunhofer institutes have competition. Universities are taking an ever larger role in technology transfer, and technology parks are springing up all over. These efforts are being complemented by the federal programmes for pumping money into start-up companies.
Such a strategy may sound like a recipe for economic success, but it is not without its critics. These people worry that favoring applied research will mean neglecting basic science, eventually starving industry of fresh ideas. If every scientist starts thinking like an entrepreneur (企业家), the argument goes, then the traditional principles of university research being curiosity-drive, free and widely available will suffer. Others claim that many of the programmes to promote technology transfer are a waste of money because half the small businesses that are promoted are bound to go bankrupt within a few years.
Wh ile this debate continues, new ideas flow at a steady rate from Germany?s research networks, which bear famous names such as Helmholtz, Max Planck and Leibniz. Y et it is the fourth network, the Fraunhofer Society that plays the greatest role in technology transfer.
Founde d in 1949, the Fraunhofer Society is now Europe’s largest organization for applied technology, and has 59 institutes employing 12,000 people. It continues to grow. Last year, it swallowed up the Heinrich Hertz Institute for Communication Technology in Berlin. Today there are even Fraunhofers in the US and Asia.
解题思路
文章标题——“德国的技术转让”。中心句为第一句话,文中的中文解释也使得文章脉络十分清晰,全文阐述德国在技术转让方面的优势及成就
31. What factor can be attributed to German prosperity?
A.Technology transfer.
B.Good management.
C.Hard work.
D.Fierce competition.
解题思路
32. Which of the following is NOT true of traditional university research?
A.It is free.
B.It is profit-driven.
C.It is widely available.
D.It is curiosity-driven.
解题思路
33. The Fraunhofer Society is the largest organization for applied technology in
https://www.360docs.net/doc/e37990402.html,.
https://www.360docs.net/doc/e37990402.html,A.
C.Europe.
D.Africa.
解题思路
34. When was the Fraunhofer Society founded?
A.In 1940.
https://www.360docs.net/doc/e37990402.html,st year.
C.After the unification.
D.In 1949.
解题思路
同上
35. The word “expertise” in line横线3 could be best replaced by
A.“experts”.
B. “scientists”.
C. “scholars”. D.“special knowledge”.
解题思路
历年真题实战技巧(18)
2003年卫生类B
Effects作用,效果of Exercise锻炼on Elderly年老的Diabetics糖尿病人
Most older people with so-called所谓的typeⅡ二型diabetes(糖尿病)could stop taking insulin(胰岛素)if they would do brisk(轻快的)exercise for 30 minutes just three times a week, according to new medical research results reported in a Copenhagen newspaper. Results from tests conducted on diabetics at the Copenhagen central hospital Rigshopitalet?s Cen ter for Muscle Research showed that physical exercise can boost the body?s ability to make use of insulin by 30 per cent. This is equal to the effect most elderly diabetics get from their insulin medication (药物治疗) today.
Researchers had a group of non-diabetic men and a group of men with typeⅡ diabetes, all more than 60 years of age,exercise on bicycles six times a week for three months. After the three months the doctors measured how much sugar the test subjects’muscles could make use of as a measure for how well their insulin worked.
Associate Professor Dr Flemming Dela of the Muscle Research C7enter said the tests demonstrated that the exercising diabetics has made as good use of insulin as the healthy non-diabetic persons. “This means that the insulin works just as well for both groups. Physical exercise cannot cure people of diabetes, but is can eliminate almost all their symptoms. At the same time it can put off the point at which they have to begin taking insulin,” Dela said.
Insulin is a hormone produced by the pancreas(胰腺), controlling sugar in the body and is used against diabetes.
Dela said that to achieve the desired effect diabetics need only exercise to the point where they begin to sweat,but that the activity has to be maintained since it wears off after five days without sufficient exercise.
Most diabetics realize that they have to watch their diet while remaining unaware of the importance重要性of exercise, Dela added.
解题思路
本文的标题非常明朗——“老年糖尿病人锻炼的作用”,文章都是按照这个主题展开论述的,故标题就为文章的中心句。
36 What is the effect of exercise on elderly people with typeⅡ diabetes?
A. It can worsen their symptoms.
B. It can help the body make better use of insulin.
C. It can help them to eat more.
D. It can cure them of the disease.
解题思路
37 The exercise that the researchers tried on their test subjects was
A. cycling six times a week for three months.
B. walking briskly for thirty minutes three times a week.
C. swimming twice a day.
D. running once a day.
解题思路
38 The researchers checked how well the test subjects? insulin worked by measuring
A. The blood sugar level in their bodies.
B. The length of time they could cycle in one breath.
C. The amount of sugar their muscles could make use of.
D. The amount of insulin they took.
解题思路
39 It is recommended that diabetics maintain sufficient exercise since otherwise否则
A. their symptoms will get worse.
B. the blood sugar level will go up.
C. their condition will be out of control.
D.the desired effect cannot be achieved.
解题思路
40 It can be seen from the passage that most diabetics are ignorant忽视of
A. The significance重要性of regular exercise.
B. The necessity of watching their diet.
C. The need to control their weight.
D. The consequences of taking too much insulin.
解题思路
-化工流程图解题技巧
化工流程图解题技巧及练习 一、无机化工流程题的特点 1、工业生产流程的主要框架:原料T I预处理T II分离提纯T III核心反应T产品 2、试题本质:想办法从混合物中提取纯净物。 3、考察内容:核心考点:物质的分离操作、除杂试剂的选择、生产条件的控制、产品分离提纯。 (1)据流程图或题目提供的反应物和部分生成物书写情景方程式;(2)滤渣的成分;(3)滤液的成分;(4)核心反应条件的控制和原因;(5)选择化学除杂试剂及原因;(6)调PH值的范围及试剂的选择; (7)相关实验仪器;(8)相关计算。等等。 二、解题技巧 (一)读题 1、①先粗读:明确原料、明确杂质、明确目标产品。先不必把每个环节的原理都搞清楚。 ②针对问题再精读:分析细节,根据问题去研究某一步或某一种物质。 ③第三,要看清所问问题,不能答非所问,并注意语言表达的规范性。 【注】:在答题时应注意:前一问回答不了,并不一定会影响回答后面的问题。 2、读流程图的方法:抓箭头:①主线主产品;②支线副产品;③回头循环品。 3、思考要有方向一一在基础理论框架下结合实际问题进行思考。常用思考方法: ①反应原理:复分解、氧还反应发生的条件,书写原则等 ②提高原料利用率:利用好副产品、循环使用原料、能量尽可能利用。 ③快速反应:化学反应速率(措施有粉碎、加热、增大浓度、搅拌等) ④提高产率:化学平衡向右移动。 ⑤提高产品纯度:产品的分离、提纯等实验基本操作问题。 ⑥绿色环保:反应物尽可能无毒无害无副作用,“三废”的处理,涉及绿色化学问题。 ⑦工业成本低:原料廉价、资源丰富。 (二)、样品的预处理 1、矿样的预处理方法: (1)原料的预处理 ①粉碎的目的:增大接触面积,加快反应速率(反应快);或使反应更完全。 ②煅烧的目的:(A)除去有机物杂质或者碳的杂质(如题意告知该矿样中含C或有机物杂质); 或(B)使一些具有还原性的物质被空气中氧气氧化、分解(思考样品成分中是否有具有还原性的物质, 且看在整个流程中是否需要被氧化); 或(C)改变矿样的结构,使其在后面的酸溶(或碱溶或水溶)中更易溶解。 ③溶解:有酸溶、碱溶、水溶;又叫酸浸、碱浸、水浸) 酸浸目的:与酸反应,使可溶性金属离子进入溶液,不溶物通过过滤除去的溶解过程。 碱浸目的:与碱反应,使可溶性金属离子进入溶液,不溶物通过过滤除去的溶解过程。 水浸目的:使可溶性金属离子进入溶液,不溶物通过过滤除去的溶解过程。 (2 )【有关名词】: 浸出:固体加水(酸)溶解得到离子。 浸出率:固体溶解后,离子在溶液中的含量的多少。 【思考】提高浸出率的措施通常有哪些?---粉碎、搅拌、升温、增大酸(或碱)浓度。 2、植物样品的预处理方法: ①灼烧: (如海带中碘的提取、茶叶中铁含量的测定),灼烧成灰之后,再用水浸,为了加快其溶解速率可以加热、不断搅拌;然后再过滤,过滤之后如果得到的滤液中还有灰烬,可以再过滤一次。 ②研磨成汁: 提取植物样品中的有机物所用方法;(如波菜中草酸含量的测定),研磨成汁之后,如该 有机物可溶于水,研磨之后,可用水浸取;如该有机物不溶于水,就用有机溶剂(乙醇或苯、四氯化碳)来萃取。
新概念英语第二册第十二课教案
Lesson 12 Goodbye and good luck New Expressions: 1 luck [l?k] n.运气,幸运 2 captain ['k?pt?n] n.船长 3 sail [seil] v.航行 4 harbour ['ha:b?] n.港口 5 proud [praud] a.自豪 6 important [im'p?:t?nt] a.重要的 Notes: 1. luck: 运气,幸运 bad [hard, ill, tough] luck 不幸, 倒霉 good luck 幸运 We wish you luck. 祝你好运。 Good luck to you! 祝你成功! He came to Beijing to try his luck. 他来到北京,想碰碰运气。 You never know your luck. 你也许会走运的。 联想:(1) lucky: 幸运的,运气好的 a lucky dog 幸运儿 a lucky day 吉日 He is a lucky dog. 他是个幸运的家伙。 You are lucky to be alive after being in that accident. 你真幸运,经过那场车祸还能生还。 (2) unlucky: 不幸的 Friday is believed to be an unlucky day. 星期五被认为是不吉利的日子。 You were just unlucky. 你只是运气不好。 She was unlucky to catch a cold on the first day of her holiday. 她太倒霉了,休假第一天就感冒了。 It's considered unlucky to walk under a ladder. 从梯子下面走过被认为是不吉利的。 2. sail: 航行 Can you sail a boat? 你会驾驶船只吗? The ship sails for Shanghai tomorrow. 这船明天开往上海。 This ship sails for New York on Monday. 这船将于星期一开往纽约。 The fleecy clouds sailed across the sky. 白云飘过天空。 The duchess sailed into the room. 公爵夫人轻盈地走进了房间。 He sailed through his exams. 他顺利地通过了考试。 3. harbour: 港口 This harbour is a natural harbour. 这个港口是天然港。 They brought the boat into the harbour and dropped (the) anchor. 他们把船开进海港下锚
化工流程图解题技巧
思路+套路=出路 例谈初中化学工艺流程解题策略与核心素养的培养 一、化工流程题特点 初中化学流程图考查主要有溶液的流程和气体的流程两大类: ㈠溶液溶质流程的特点: ⒈工业生产流程的主要框架:原料→预处理→分离提纯→核心反应→产品 ⒉试题本质:想办法从原料混合物中获得纯净的产品。 ⒊考查主要内容:物质的分离操作、除杂试剂的选择、生产条件的控制、产品分离提纯。 ㈡气体流程主要考查常见气体的分离提纯或质量测定, 这类题考查问题主要设问出发点有: ⑴据流程图或题目提供的反应物和部分生成物书写情景方程式;⑵滤渣的成分;⑶滤液的成分;⑷核心反应条件的控制和原因;⑸选择化学除杂试剂及原因;⑹调pH值的范围及试剂的选择;⑺相关实验操作及仪器;⑻相关计算等等。 工艺流程题的结构分题头、流程图和问题三部分。题头一般是简单介绍该工艺生产的原材料和工艺生产的目的(包括副产品);流程图部分主要用框图形式将原料到产品的主要生产工艺流程表示出来;问题部分主要是根据生产过程中涉及到的化学知识设制成系列问题,构成一道完整的化学试题。 二、做解题过程 ㈠审题的思路——明确目标 读流程图的方法――抓箭头:①主线主产品;②支线副产品;③回头循环品。 ①原料与产品:明确原料,从原料出发,要得到最终产品,必须除去什么元素、引进什么元素?初中一般是关于Mg、Al、Zn、Fe、Cu、Ca这几种常见金属的流程。 ②步骤与目的:加入某种试剂,采取这样的方法,其目的是什么?一般只考虑后面提问有关的步骤,其他不一定要清楚。
③信息与迁移:所给信息一定有用,而且一定用到,有时还需分解、重组、迁移到本题中来。 【注】:在答题时应注意:前一问回答不了,并不一定会影响回答后面的问题。 ㈡答题的套路——原料的预处理方法: ①粉碎――目的:增大接触面积,使原料充分快速反应。 ②煅烧――目的:使原料中某些成分氧化,如碳氧化气化除去;如金属氧化为金属氧化物而易被酸溶解,在后续步骤中容易被提取。 ③溶解:有酸溶、水溶,又叫酸浸、水浸。 酸浸目的:与酸反应,使可溶性金属离子进入溶液,不溶物通过过滤除去的溶解过程。 水浸目的:使可溶性金属离子进入溶液,不溶物通过过滤除去的溶解过程。 三、核心素养化学符号书写 控制反应条件——答题的套路之一 1、调节pH值的目的:控制溶液的酸碱度使某些金属离子形成氢氧化物沉淀,从而分离除去。 调节pH值除杂:(一般是除Mg2+、Al3+、Zn2+、Fe2+、Fe3+等金属离子) ⑴除Fe2+要将其氧化成Fe3+,氧化剂可选择H2O2,原因是不引入新的杂质。 ⑵调pH值所加试剂:一般是含被提纯物质中的金属阳离子对应的a、金属;b、金属氧化物;c、金属氢氧化物;d、金属碳酸盐(总之,这些物质要能与H+反应,又难溶于水,这样可即使过量而又不会引入新的杂质离子),有时候也可能加NaOH或氨水来调pH值,要据题意具体分析(一般是加的Na+、NH4+不会在后续的程序中难以分离) ⑶pH值的调节范围:据题意告知的某离子完全沉淀或开始沉淀的pH值数据来选择,不能随意更改,应该是题目中原始数据的组合。 例题:氧化镁在医药、建筑等行业应用广泛。以菱镁矿(主要成分为MgCO3,含少量FeCO3,其他杂质不溶于酸)为原料制备高纯氧化镁的实验流程如下:
《新概念英语》第二册第12课
Lesson 12 Goodbye and good luck 再见,一路顺风 1:Our neighbor, Captain Charles Alison, will sail from Portsmouth tomorrow. We shall meet him at the harbour early in the morning. 1):一般将来时:一般将来时表示将来某个时间将要发生的动作或存在的状态,亦表示将来经常或重复发生的动作,常与表示将来的时间状语连用,如:tomorrow,next year,soon等。表示将来时间的语法手段常见的至少有5种,即“shall/will + 动词原形”;“be going to + 不定式”;“be + -ing”;“be to + 不定式”以及一般现在时。 1.1 一般将来时的构成 肯定句:主语+ shall/will + 动词原形... 否定句:主语+ shall/will + not + 动词原形... 疑问句:Shall/Will + 主语+ 动词原形...? 疑问代词/疑问副词 + shall/will + 主语+ 动词原形...? 1.2 一般将来时的肯定句 句型:主语+ shall/will + 动词原形.... 在书面语中,如果主语是第一人称,常用“助动词shall + 动词原形”构成一般将来时的肯定句,即“I/we + shall + 动词原形”;shall可缩写为'll: If I have time tomorrow,I think I'll get a haircut.如果我明天有时间,我想去理个发。 在口语中,所有的人称都可以用will,即“主语(所有人称)+ will + 动词原形...”;will可缩写为'll: Some day,I'll tell you.将来某一天我会告诉你的。 1.3 一般将来时的否定句:句型:主语+ will/shall + not + 动词原形... 一般将来时的否定句是在will/shall后加not;will not可缩写为won't;shall not可缩写为shan't:Mary won't go to the party.玛丽不会去参加晚会。 1.4 一般将来时的一般疑问句句型:Shall/Will + 主语+ 动词原形... 回答方式:Yes,主语+ shall/will. No,主语+ shall/will + not. 一般将来时的一般疑问句是将助动词shall/will置于主语之前(大写shall/will的第一个字母),在句尾加问号;这种语序是主语和谓语倒装语序: Will he come? 他来吗? Will you be at our next meeting? 我们下次开会你来吗? Will you be free tonight? —Yes,I will./No,I won't(be free).今晚你有空吗? ——是,我有空。/不,我没有空。 Will they be here tomorrow? —Yes,they will./No,they won't.他们明天到这儿来吗? ——是,他们明天来。/不,他们明天不来。 Shall we be back in time? —Yes,we shall./No,we shall not.我们将及时回去吗? ——是的。/不,我们不赶回去。 1.5 一般将来时的特殊疑问句 句型:疑问代词/疑问副词+ shall/will + 主语+ 动词原形... 一般将来时的特殊疑问句是将疑问代词/疑问副词置于助动词shall/will之前(shall/will的第一个字母无需大写),和一般疑问句差不多,在句尾加问号;这种语序是主语和谓语倒装语序。就主语提问时,将疑问代词或带有疑问限定词的名词词组置于助动词shall/will之前,在句尾加问号;这种语序是陈述句语序: 1
化工流程图解题技巧
思路+套路=出路 例谈初中化学工艺流程解题策略与核心素养的培养 一、化工流程题特点初中化学流程图考查主要有溶液的流程和气体的流程两大类:㈠溶液溶质流程的特点: 1?工业生产流程的主要框架:原料T预处理T分离提纯T核心反应T产品 2?试题本质:想办法从原料混合物中获得纯净的产品。 3?考查主要内容:物质的分离操作、除杂试剂的选择、生产条件的控制、产品分离提纯。 ㈡气体流程主要考查常见气体的分离提纯或质量测定,这类题考查问题主要设问出发点有: ⑴据流程图或题目提供的反应物和部分生成物书写情景方程式;⑵滤渣的成分;⑶滤液的成分;⑷核心反应条 件的控制和原因;⑸选择化学除杂试剂及原因;⑹调pH值的范围及试剂的选择;⑺相关实验操作及仪器;⑻相关 工艺流程题的结构分题头、流程图和问题三部分。题头一般是简单介绍该工艺生产的原材料和工艺生产的目的(包括副产品);流程图部分主要用框图形式将原料到产品的主要生产工艺流程表示出来;问题部分主要是根据生产过程中涉及到的化学知识设制成系列问题,构成一道完整的化学试题。 二、做解题过程 ㈠审题的思路——明确目标 读流程图的方法一一抓箭头:①主线主产品;②支线副产品;③回头循环品。 ①原料与产品:明确原料,从原料出发,要得到最终产品,必须除去什么元素、弓I进什么元素?初中一般是关 于Mg Al、Zn、Fe、Cu Ca这几种常见金属的流程。 ②步骤与目的:加入某种试剂,采取这样的方法,其目的是什么?一般只考虑后面提问有关的步骤,其他不一定要清楚。 ③信息与迁移:所给信息一定有用,而且一定用到,有时还需分解、重组、迁移到本题中来。【注】:在答题时应注 意:前一问回答不了,并不一定会影响回答后面的问题。 ㈡答题的套路——原料的预处理方法: ①粉碎一一目的:增大接触面积,使原料充分快速反应。 ②煅烧-- 目的:使原料中某些成分氧化,如碳氧化气化除去;如金属氧化为金属氧化物而易被酸溶解,在后 续步骤中容易被提取。 ③溶解:有酸溶、水溶,又叫酸浸、水浸。 酸浸目的:与酸反应,使可溶性金属离子进入溶液,不溶物通过过滤除去的溶解过程。水浸目的:使可溶性金 属离子进入溶液,不溶物通过过滤除去的溶解过程。 三、核心素养化学符号书写控制反应条件——答题的套路之一1、调节pH值的目的:控制溶液的酸碱度使某些金属离子 形成氢氧化物沉淀,从而分离除去。调节pH值除杂:(一般是除Mg+、A|3+、Zn2+、Fe2+、Fe3+等金属离子)⑴除Fe2+要将其氧化成Fe3+,氧化剂可选择fQ,原因是不引入新的杂质。 ⑵调pH值所加试剂:一般是含被提纯物质中的金属阳离子对应的a、金属;b、金属氧化物;c、金属氢氧化物; d、金属碳酸盐(总之,这些物质要能与H+反应,又难溶于水,这样可即使过量而又不会引入新的杂质离子),有 时候也可能加NaOH或氨水来调pH值,要据题意具体分析(一般是加的Na+、NH+不会在后续的程序中难以分离) ⑶pH值的调节范围:据题意告知的某离子完全沉淀或开始沉淀的pH值数据来选择,不能随意更改,应该是题 目中原始数据的组合。 例题:氧化镁在医药、建筑等行业应用广泛。以菱镁矿(主要成分为MgCO含少量FeCO,其他杂质不溶于酸) 为原料制备高纯氧化镁的实验流程如下:
选择题解题技巧和规律
一、选择题解题技巧和规律: (一)、选择题的命题规律 1.选择题的命题具有较强的综合性 2.多为单项选择题(如全国卷、天津卷等)3、多为连题型选择题(一个材料包括多个选择题)4、选择题内容更加关注社会热点 (二)应试策略1、沉着冷静,相信自己判断2、认真审题3、先易后难,跳过难题或自己认为没有把握的题目,回头再做4、认真检查,但不要轻易改动答案 (三)应试技巧1、做到:“三审”,即一审材料(加以引申)、二审题干(画出关键词)、三审选项(找出合理、正确并与材料和题干有关的选项)。2、读完题组内每一个小题,注意各小题之间的前后提示语,然后再从容做题。3、仔细分析题干,明确解题条件例如:北极地区寒风凛冽,考虑到当地所处风带的盛行风向,中国北极科学探险考察站营地建筑的门窗应该避开的朝向是:A、东南方向B、西南方向C、西北方向D、东北方向答案:D 点拨:题干条件是北极附近盛行风向、门窗避开的朝向。北极附近风带为极地东风带,具体风向为东北风,故门窗应避开东北方向。4、选项错误的几种情况:(1)因果颠倒(2)前后矛盾(3)表述绝对化(4)概念混淆(5)表述错误或不完整(6)以偏概全,以点带面(7)与题干无
关 (四)解题方法介绍1、直选法:运用学过的知识可以直接选出来,多考察记忆性知识,注意必须看完所有选项再选择。2、排除法:如果选项罗列地理事物或现象比较多,可以先将选项与题干对照,排除掉明显错误的选项,重点分析剩余选项。例如:(2005年江苏卷)长期以来,塔里木河流域及其周边地区生态环境较为脆弱。塔里木河流域综合治理的关键是水资源的合理利用。下列方案合理的是()A.上中游地区利用绝大部分河水B.人工加速冰川消融,增加河水的补给C.下游地区利用绝大部分河水D.上中游和下游地区均衡利用河水答案:D 点拨:既然全流域要综合治理,部分河段就不应该利用绝大部分河水,故排除了A、C;用人工加速冰川消融来补给河水,不现实,又可以排除B,正确答案为D。3、优选法:如果选项中有多项合理,但题干中有“最”、“主导”、“第一”等字样时,要选择最合理选项。例如:美国“硅谷”形成的主导因素是:A、环境优美B、交通便利C、知识技术D、市场广阔答案:C 点拨:形成高技术工业区的区位因素包括知识技术、快捷交通、优美的环境,但主导因素是科技发达。4、转换法:即将条件换成另外一种相同的说法,该说法与选项更直接,利于选择。例如:一年中太阳直射两次的地区,不会有:A、热带沙漠气
新概念英语第二册第12课课文讲解
单词学习 luck n. 运气,幸运 captain n. 船长 sail v. 航行 harbour n. 港口 proud adj. 自豪 important adj. 重要的 ★luck n. 运气, 幸运 good luck 祝你好运 bless you 保重(比如在别人打喷嚏时说的话) lucky adj. 幸运的 lucky dog 幸运儿 lucky day 幸运日 It’s my lucky day. 今天我真幸运 luckily adv. 幸运地 unlucky adj. 不幸的 ★captain队长,船长 captain+人名,表示“某队长/船长” ★sail v. 航行 ① vi. (船)航行,扬帆行驶 The ship is sailing for New York. 这条船正驶向纽约 ② vi. (人)乘船航行 I want to sail around the world. 我想乘船环球旅行 ③ n. 帆,篷 This boat has white sails. 这个船的帆是白色的 ★proud adj. 自豪,自满 ①be proud of 以……为自豪,为(某人)感到自豪 Parents are proud of their children. 父母为自己的孩子感到自豪 ②be pround to do sth很骄傲的做某事 I am pround to call you my friend.我很骄傲地称你是我的朋友。 pride n. 自豪 have/take pride in 以……为自豪 He has great pride in his ability. 他对自己的能力感到 (非常) 骄傲We take a lot of pride in our country.我们为我们的国家感到自豪。 ★important adj. 重要的 The matter is important to us. 那件事对我们很重要 It is important for you to do that. 对你来说,做那件事是很重要的importance n. 重要,重要性 She stressed the importance of this work. 她强调了这个工作的重要性 课文讲解: neighbour, Captain Charles Alison, will sail from Portsmouth tomorrow. 我们的邻居查尔斯·艾利森船长明天就要从朴次茅斯启航了。
语文选择题答题技巧
语文选择题答题技巧 文考试由于累积了大量知识,并且某些题还要假设他们观点,使得很多人在选择题上丢分,但是从技巧的角度上说无非就是根据语义做题。抓住其中字、词、句的矛盾点,会不会引发歧义?应用对象是否明确?陈述观点有没有符合原文大意?抓住这几个要点,选择题几乎没有什么难度了,希望大家在平时做题的时候注意从这些角度做些训练,以提高做题速度。 语文选择题答题技巧 1、运用心理效应 运用心理效应包括做深呼吸;告诫自己,仔细审题等等。 2、要有扎实的功底 语文考试实际上就是调动自己平时的积累来回答问题的过程,不仅要善于回忆,更需要在理解题意的基础上组织答案。在组织答案的过程中必须注意句子的简明连贯得体、注意保留命题者的原意、注意满足题旨、注意少用绝对化的句子。 3、自己做题的方法和题型 如果基础好成绩却没有别人好,可考虑自己做题的方法,这是其一。其二,应研究几份试卷看看有没有哪种题型特别薄弱。找准问题,对症下药。 4、做题的方法 做语文选择题首先要审清题意,其次要方法,比如采用直接法、比较法、排除法、代入法等等答题。要注意相信自己的第一语感,不要轻易改动,相信自己的第一印象。 5、做选择题的办法 做对题的根本因素还是对知识的掌握,但在考试中掌握一
些方法,一些应试技巧,也有助于得分。选择题都有题干,题干当中包含内容和要求。选择题总是有正确选项和迷惑选项这么两种选项。正确选项当然是正确答案,而迷惑选项则是用来迷惑考生的,看考生能不能区别正确选项和迷惑选项。题干的后面,一般有四个选项。如果是单选题,则只选择一个选项作为答案,其余的都是迷惑项;如果是多选题,则要选择两个或两个以上的选项作为答案。 语文选择题答题技巧 1.【字音辨析题】答题技巧: 常见字注音正确的可能性小。生僻字一般不会标错音。审清题干,用排除法是较好的方法。 2.【字形辨析题】答题技巧: “形近而音”不同的别字。生僻字一般不会错。平时多积累。 3.【词语运用题】凭语感去选择自己认为的最佳答案,一般有两种类型: 答题技巧:对词义的理解,先拿你最会的词语去排除,对词语的运用,一定要在上下文中找到相应的信息,重点是使用场合上的搭配。注意采用排除的方法,将最容易辨析的词语先排除,逐渐减少选项。 4.【熟语(含成语)辨析题】答题技巧: 第一,逐字解释熟语,运用成语结构特点把握成语大意,但要注意不能望文生义; 第二,体会熟语的褒义贬义中性等感情色彩; 第三,要注意熟语使用范围,搭配的对象; 第四,尽可能找出句中相关联的信息。 第五,四个选项权衡比较,选出认为最符合要求的。
无机化工流程图题地解答方法及常见答题技巧
无机化工流程图题的解答方法及常见答题技巧 工艺流程题的结构分题头、题干和题尾三部分。题头一般是简单介绍该工艺生产的原材料和工艺生产的目的(包括副产品);题干部分主要用框图形式将原料到产品的主要生产工艺流程表示出来;题尾主要是根据生产过程中涉及到的化学知识设制成系列问题,构成一道完整的化学试题。因此解答化工工艺流程题的基本步骤是: 推荐阅读:运用规律解工艺流程题——“模型解题法” 一、读题头,得目的,划原料明产品,解决“干什么” 通过阅读题头,了解流程图以外的文字描述、表格信息、后续设问中的提示性信息,通过对比分析工业流程示意图中的第一种物质(原材料)与最后一种物质(产品),弄清从原料出发,要得到最终产品,必须除去什么元素、引进什么元素?阅读题干时要随手画出题目提供的一些课本上未出现过的诸如溶解度、物质的热稳定性和熔沸点等不知何用的信息,以便在后面阅读流程图和解题时随时调用。
二、读题干,析过程,看措施推用意,解决“怎么做” 题干部分主要用框图形式将原料到产品的主要生产工艺流程表示出来。分析流程中的每一步骤的反应物是什么?发生了什么反应?利用了什么原理(氧化还原、溶解度、电离平衡、水解平衡、溶解平衡)?该反应造成了什么后果(除目标物质外还产生了什么杂质或副产物?这些物质又是如何分离、提纯和循环利用的?如何体现绿色化学思想?)?每一步操作进行到什么程度最佳?在此过程中抓住一个关键点:一切反应或操作都是为获得产品而服务,在回答相关操作的原因或目的时要从对产品的影响层面作答。
我们把它分为三个层次:读得懂的;读得不太懂但根据上下文可以勉强懂的;完全读不懂的。 快读读得懂的,对于读得懂的,往往是常见的化学反应、化学实验操作等基础知识,是要求学生必须掌握的。出题者常在这些环节设问,让大部分学生都能得到这些分。因此要克服恐惧心理意识到,无论流程图如何复杂都会有简单的得分题。例如一些灼烧、水浸及过滤的目的。
高中化学工艺流程题目解题技巧
化学工艺流程题近几年是高考的热点,所占的分值也相当重,但由于此类试题陌生度高,对学生的能力要求也大,加上有的试题文字量大,学生在没做之前往往就会产生畏惧感,所以这类题的得分不是很理想。 要解好这一类题,学生最重要的是要克服畏惧心理,认真审题,找到该实验的目的。一般来说,流程题只有两个目的:一是从混合物中分离、提纯某一物质;另一目的就是利用某些物质制备另一物质。 一、对于实验目的为一的题目,其实就是对混合物的除杂、分离、提纯。当遇到这一类题时,要求学生一定要认真在题目中找出要得到的主要物质是什么,混有的杂质有哪些,认真分析当加入某一试剂后,能与什么物质发生反应,生成了什么产物,要用什么样的方法才能将杂质除去。只有这样才能明白每一步所加试剂或操作的目的。这里特别提一提蒸发与结晶。蒸发与结晶方法都可以将溶液中的溶质以固体形式析出,具体采用何种方法,主要取决于溶质的溶解度。 有的物质它的溶解度随温度的升高变化比较大,如NH4NO3、KNO3等物质,在蒸发过程中比较难析出来,所以要用冷却法使它结晶。而有的物质它的溶解度随温度的升高变化比较小,如NaCl、KCl等,有少数物质的溶解度随温度的升高而减小,如Ca(OH)2要使它们析出较多固体溶质时,则要用蒸发浓缩的方法。例如NaCl 和KNO3混合溶液,如果将混合溶液蒸发一段时间,析出的固体主要是NaCl ,母液中是KNO3和少量NaCl 。如果将混合溶液加热后再降温,则析出的固体主要是KNO3,母液中是NaCl 和少量KNO3。如果是除杂,杂质所含的量比较少,一般是让主要物质析出来。如KNO3溶液中含少量NaCl,常用升温冷却结晶法,再经过过滤、洗涤、烘干(不同的物质在烘干时采取的方法不同),就可得到KNO3固体了。如果NaCl溶液中含少量KNO3,则用蒸发浓缩结晶法.,这种方法一般要经过趁热过滤才能得到主要物质,主要原因是如果温度下降,杂质也会以晶体的形