Unit 12 单元测试题
一．单项选择
1. France is _______ European country; Japan is_______ Asian country.
A. an; the
B. a; a
C. a; an
D. an; an
2. Mr. Lee _____ all night in order to watch the football match between France and Italy.
A. put up
B. stayed up
C. got up
D. showed up
3. I am looking for a house. I’d like _______ with a garden. A. one B. it C. that D. this
4. －When was David born? －He was born _____ June 12，1989.
A. At
B. in
C. on
D. For
5.She ______Shanghai next week. A. is leaving for B. leaves for C. leaved D. left
6. I prefer to offer more money for a better computer _______ less for this one.
A. to pay
B. not to pay
C. rather than to pay
D. rather than pay
7. —Why was he late for school yesterday?
—He overslept. By the time he got to the bus stop, the bus _____ already _____.
A. was; leaving
B. has; left
C. would; leave
D. had; left
8. Hurry up! The play _____ for ten minutes.
A. has begun
B. had begun
C. has been on
D. began
9. —What was the weather like yesterday? —It was terrible. It rained so____ that people could ___ go out.
A. hardly; hardly
B. hard; hardly
C. hard; hard
D. hardly; hard
10. By the time I got to the airport, the plane ________ .
A. have taken off
B. had taken off
C. is taken off
11.. Marie got married ________ a policeman last year.
A. with
B. for
C. to
12.. The volunteer spoke as ________ as to make the visitors understand her.
A. clearly
B. more clearly
C. the most clearly
13. ---May I ________ your English-Chinese dictionary? ---Sorry, I ________ it at home.
A. borrow; left
B. borrow; forget
C. lend; left
14.. Oh, my god! It’s a gift fro James. I forget ________ it this afternoon.
A. post
B. to post
C. posting
15.. ________exciting news it is that we won the match! A. How B. What a C. What
16.. April Fool’s Day _____ every April 1st. A. will be celebrated B. is celebrated C. was celebrated
17.. Tom, it’s cold outside. ______ your coat when you go out. A. put up B. put on C. put away
18.. Many pe ople don’t realize the importance of health ________ they have fallen ill.
A. until
B. when
C. while D by the time
19.. As I _________ west, I saw a huge truck in the middle of the road.
A. headed
B. is heading
C. was heading
20.. There are ________ passengers waiting at the train station.
A. hundreds
B. hundred
C. hundreds of D 3 hundreds
21. He said he wouldn’t angry with me________. A. any more B. no more C .no longer
22. This is the most beautiful place ________ I have ever visited. A. that B. where C. which
23.. The party ended up_________. A. sing B. to sing C. singing
24.. -----Can you tell me _________? ----Because I missed the bus.
A. why were you late for class
B. why you were late for class
C. how you came to school
25.When did you meet Jack for the first time?
I met him ____ the airport ____ National Day. A at, in B at, on C on, in
26 The burger alarm _____ as soon as the thief touched the box. A goes off B will go off C went off
27.The wounded fish is swimming in the river. It is still ______. A alive B living C liveD lively
28 ----Do you have iPhone 5 mobiles? ---- Sorry, they have been______. You may come next week.
A given out
B looked out
C sold out
D come out
29 The ____ about eight hundred English words by the end of last month.
A have learned
B had learned
C will learn
D are going to learn
30 Sally is very shy. So she finds it _____ to make a speech in public.
A embarrassing
B interesting
C relaxing
D embarrassed
31-- Why are so angry with Michael?
---Because I waited for him two hours last night, but he didn’t ____ at last.
A appeared
B show up
C hand up
D come up
32 Can you tell us ______ on April fool’s Day?
A what she happened
B what did she happen
C what happened to her
D what had happened to her?
二完形填空
Here’s a part of an e-mail answer from Joe giving some advice to his son in college. “ 1 I was young, I often met troubles about what to do and what not to do. My grandmother told me not to 2 about those things. I only did 3 once a year or once a lifetime. 4 , I should try to do those things well, and I do them every day. 5__ example, I need to eat every day, so I should learn how to 6 . I need to talk to others every day, so I should learn how to work with different people 7 know how to speak well. I walk every day, so my 8 should be all right and comfortable. Every night I sleep, so my bed should let
me 9 a good rest. Taking care of the everyday things 10 that you do a better job of the one-in-a-lifetime things as well.”
1. A. After B. Before C. When D. While
2. A. make B. worry C. want D. carry
3. A. them B. it C. ones D. one
4. A. Well B. Yet C. Instead D. Really
5. A. To B. In C. At D. For
6. A. water B. cook C. clean D. look
7. A. and B. or C. so D. but
8 .A. bags B. coats C. shirts D. shoes
9. A. give B. make C. have D. do
10. A. learns B. means C. says D. Hears
III．阅读理解
A
James and his wife went to Beijing Restaurant for dinner at 7:00 pm. On April 1st, 2005, while they were eating, a waitress came to tell them that the two men at the next table were film-makers and that they would like to have a talk with James.
James agreed. One man came to sit down next to him and said that they were making a film named “The Magic Gloves.” The story was like “Harry Potter” and they were looking for an actor to play a magician. They would like to invite James to have a try.
James was excited, “Many people think I look like Patrick Steward.” However, as he was going to leave China in 3 days, he wanted to try out after dinner. The man agreed.
At 9:00 pm, when James asked for the bill so that he could go with the film-makers, the manager of Beijing Restaurant said sorry to him with a smile, “It’s April Fool’s Day joke! Your meal is free. Thank you.”
James completely forgot about it but when he found that he was fooled, he did n’t leave at once. The waitress asked him if he needed some help. James said, “I was fooled once. I’m afraid the meal is not free. I
am waiting for the bill to see if it is another joke.”
1. James came to the restaurant _________.
A. to have dinner
B. to meet the film-makers
C. to celebrate April Fool’s Day
D. to play a magician
2. James agreed to act out because .
A. he was full
B. he thought he looked like Patrick Steward
C. he wanted to make some money
D. he liked Harry Potter
3. The phrase “was fooled” in the last paragraph probably means .
A. was attacked
B. was laughed at
C. was disturbed
D. was played a joke on
4. Which of the following is true?
A. James stayed at the restaurant for less than two hours.
B. The two men sitting next to him were really film-makers.
C. James didn’t know it was April Fool’s Day until he was told so.
D. James left the restaurant right after dinner.
5. When the manager came to tell him the truth, James .
A. was angry that he had been fooled
B. was pleased that he had been given a free meal
C. was still not sure if they were playing another joke on him
D. decided to wait for another free meal
B
A great man married the woman and they had a little lovely girl.
When the little girl was growing up, the man usually hugged her and said, “I love you, little girl.” The little girl would say, “I am not a little girl any more.” Then the man would laugh, “But to me, you’ll always be my little girl.”
The little girl later left her home and went into the world. No matter where she was, the man would call her and say, “I love you, little girl.”
One day the little girl received an unexpected phone call. The great man had a stroke. He couldn’t talk, smile, walk, hug or dance.
She went to the side of the great man soon. He looked at her and tried to speak, but he could not. She sat next to the great man, and drew her arms around his useless shoulders. Her head on his chest, she thought of many good memories. She felt sad for she couldn’t hear the words of love that had comforted her.
And then she heard from within the man, the beat of heart. The magic happened. She heard what she wanted to hear. His heart beat out the words that his mouth could no longer say… I love you, little girl… I love you, little girl.
1. The great man ______ when the little girl said, “I’m not a little girl any more.”
A. felt sad
B. was happy
C. was angry
D. couldn’t stand
2. What did the man do after the little girl left her home?
A. He left her wife.
B. He learned to sing and dance.
C. He left his home and went into the world.
D. He would call her and expressed his love to her.
3. The little girl went to her father because_______.
A. he had a stroke.
B. she missed her parents
C. she made a lot of money outside
D. she didn’t get his father’s calls
4 What’s the meaning of the word underlined.
A 打击B绳子C 敲击D中风
5. What can we learn from what the girl had done after seeing his father?
A. She knew his father would die soon.
B. She had regretted for leaving his father.
C. She loved her father deeply too.
D. She was sure his father would recover soon.
四任务型阅读
UNICEF is the United Nations International Children’s Emergency Fund. It raises money and helps
millions of young people around the world. There are four main UNICEF projects at the moment: Under Fives. Every year, ten million young children die. We can stop this. We can give children a better start in life — healthy food, a good home and a good school.
Child Workers. Many children do not go to school — they work in factories.
They often work twelve or fourteen hours a day. ③And about 300,000 children in the world are soldiers — some are only eight years old! This is wrong and we want to stop it.
Girls’ Education. More boys than girls in the world go to school. Some girls do not learn to read or
write and later in life they don’t get good jobs. Education is good for both boys and girls. We want more girls in schools.
Medicine. Every year more than two million children _____ diseases because they do not have
enough medicine. Medicine is not expensive. We give medicine to 40% of the world’s children, mainly
in Africa and Asia.
Buy UNICEF products— cards, T-shirts, teddy bears. Is there a UNICEF group in your area? Join your local group! Raise some money with your friend and give it to UNICEF.
任务一回答问题
1.Is UNICEF the United Nations International Children’s Emergency Fund?
______________________________________________________________
2.What does UNICEF do?
___________________________________________________________________________
任务二英译汉
3_____________________________________________________________________
任务三在句子的空白处填上一个合适的词组，每空一词
4 Every year more than two million children _____ _____diseases because they do not have
enough medicine.
任务四给文章拟一个最佳标题
5. What is the best title in the passage ？_______________________________________
五. 选择恰当的单词填空，将答案填写在文章下面的横线上，每词限用一次。
and, , voice, myself , answered, nearly, happy, , including, reached
Long long ago, all feelings lived on an island(岛): Happiness, Sadness, Knowledge and all of the others, 1. Love. One day it was said that the island would sink, so all of the feelings were busy making boats and ready to go.
The crucial moment came at last! When the island 2. sank, Love gave her boat to poor people who couldn't make a boat. Now it was Love's turn to ask for help.
Richness(财富)was passing by Love in a boat. Love said, “Richness, can you take me with you?” Richness 3. , “No, I can't. There is a lot of treasure(金银财宝) in my boat. There is no room here for you.” Just at that time, Sadness was nearer, so Love asked, “Sadness, let me go with you.” “Oh, Love, I am so sad that I need to be alone by 4._______.” Happiness passed by Love, too, but she was too 5. to hear clearly what Love said to her.
Suddenly, there was a 6. , “Come on, Love, I will take you.” It was an elder. Love even forgot to ask him where they were going. When they 7. dry land, the elder went away. Love asked Knowledge, another elder, “Who helped me?”
“It was Time.” Knowledge answered.
“Time?” asked Love. “But why did Time help me?”
Knowledge smiled 8. answered, “Because only Time can understand how important Love is.”
实验思考题参考答案 实验Fe(OH)3胶体的制备、破坏、分离 1.常压过滤时滤纸为什么要撕去一角？答：使滤纸紧贴玻璃漏斗，有利于排出滤纸与玻璃漏斗之间气泡，形成液柱。 2.抽滤时剪好的滤纸润湿后略大于布氏漏斗的内径、或剪的不圆周边凸出部分贴在布氏漏斗内壁上，对抽滤有何影响？为什么？答：会造成漏虑。滤纸大于布氏漏斗内径会造成滤纸折叠，不能紧贴布氏漏斗。 3.抽滤时，转移溶液之前为什么要先稍微抽气，而不能在转移溶液以后才开始 抽气？答：使滤纸紧贴布氏漏斗，以免造成漏虑。 4. 沉淀物未能铺满布氏漏斗底部、滤饼出现裂缝、沉淀层疏松不实，对抽干效果有什么影响？为什么？如何使沉淀抽得更干爽？答：固液分离效果不好；漏气使压差变小；用药勺铺平、压实沉淀物再抽滤。 由胆矾精制五水硫酸铜 1.结晶与重结晶分离提纯物质的根据是什么？如果被提纯物质是NaCl 而不是CuSO4·5H2O，实验操作上有何区别？ 答：根据物质溶解度随温度变化不同。NaCl 的溶解度随温度变化很小不能用重结晶的办法提纯，要用化学方法除杂提纯。 2.结晶与重结晶有何联系和区别？实验操作上有何不同？为什么？ 答：均是利用溶解度随温度变化提纯物质；结晶浓缩度较高（过饱和溶液），重结晶浓缩度较低（饱和溶液），且可以进行多次重结晶。结晶一般浓缩到过饱和溶液，有晶膜或晶体析出，冷却结晶；重结晶是在近沸状态下形成饱和溶液，冷却结晶，不允许浓缩。
3.水浴浓缩速度较慢，开始时可以搅拌加速蒸发，但临近结晶时能否这样做？ 答：搅拌为了加快水分蒸发；对于利用晶膜形成控制浓缩程度，在邻近结晶时不能搅拌。否则无法形成晶膜。 4.如果室温较低，你准备采用什么措施使热过滤能顺利进行？答：预热漏斗、 分批过滤、保温未过滤溶液。 5.浓缩和重结晶过程为何要加入少量H2SO4？答：防止防止Fe3+水解。 粗盐提纯 1.为什么说重结晶法不能提纯得到符合药用要求的氯化钠？为什么蒸发浓缩时 氯化钠溶液不能蒸干？ 答：NaCl 的溶解度随温度变化很小不能用重结晶的办法提纯，药用氯化钠不仅要达到纯度要求，还要符合药用要求。不能浓缩至干NaCl 溶液，是为了除去KCl。 2.用化学法除去SO42-、Mg2+ 、Ca2+的先后顺序是否可以倒置过来？为什么？ 答：不能，除杂要求为除去杂质引入的离子必须在后续的除杂过程中除去，先除去Mg2+ 、Ca2+后除SO42-，无法除去Ba2+。 3.用什么方法可以除去粗盐中不溶性杂质和可溶性杂质？依据是什么？ 答：不溶性杂质用过滤方法；可溶性杂质用化学方法除杂。依据：溶度积。 醋酸解离度和电离常数测定 1.不同浓度的HAc 溶液的溶解度α是否相同？为什么？用测定数据说明弱电解质解离度随浓度变化的关系。 答：不同，因K a,θ AH 。c↑,α↓。 c 2.测定不同浓度的HAc 溶液的pH 值时，为什么按由稀到浓的顺序？答：平衡块，减小由于润洗不到位而带来的误差。
九年级英语课文翻译unit12 Section A 2d 马特：凯文，为什么你今天迟到了？ 凯文：我的闹钟没有响！我一直睡觉，当我醒来时，已经是早上8点了！ 马特：噢！，不！ 凯文：所以我迅速穿上衣服冲出家门。 马特：你没吃早饭吗？ 凯文：没有，我甚至没有刷牙也没有洗脸！但在我到达车站前，汽车已经开走了。 马特：那你是怎么来这儿的？ 凯文：幸运的是，卡尔的父亲看见我在路上，让我打了他的车。 马特：嗯，至少当你到达学校时，上课只迟到5分钟。 Section A 3a 生活充满了意外 2001年5月，我在纽约世贸中心找到一份工作。在2001年9月11日，我大约在早上八点半到达了工作的大楼，这时我决定先买一杯咖啡。我去了我最喜欢的咖啡店，虽然它在我办公室东边的两个街区以外。当我正在和其他办公室工作职员排队等候的时候，听到一声巨响。我还没来得及加入屋外的人群弄清究竟发生了什么事，第一架飞机已经撞上了我办公室的大楼。我们直愣愣盯着燃烧着的大楼上升起的黑
烟，无法相信（这一切）。我觉着我能够活着很幸运。 大约10年之后，2011年2月21日，我早上10：00 醒来意识到我的闹钟根本没响。我从床上跳起来直奔机场。但是当我到达机场时，我飞往新西兰的航班已经起飞了。“这可是我今年的第一个假期，我居然误了航班。真倒霉！”我暗想。其他的航班都已经满员，我不得不等到第二天。（结果）第二天早上,我听到新西兰昨天发生了地震。我的坏运气意想不到变成了一件好事。 Section B 2b 愚人节是一个世界上许多不同国家都进行庆祝的节日。它在每年的四月一日，这是一个许多人会互相开各种玩笑或恶作剧的日子。 有一年的愚人节，英国的一位记者宣称因为意大利农民停止种植意大利面条，因此以后将不再有意大利面条了。许多人都跑到当地超市尽可能多地买意大利面。等人们意识到这是一个恶作剧的时候，全国所有的意大利面条都被卖光了。在英国另一个恶作剧中，一电视节目报道发现了一种特殊的水。他们说这种水可以帮助人们减肥，有一位消费者仅四个月就减掉了很多体重。（结果）当天结束之前，超过10,000人打电话到电视台，询问如何得到这种水。 许多愚人节的玩笑的结局并不那么有趣。一位著名的电视明星曾经在愚人节邀请他的女朋友上他的电视节目。他向她求婚。那位女士是如此的高兴因为她真的想结婚了。然而,当她说好的时候，他却回答“愚人节傻瓜！”那个小玩笑结局并不快乐。电视明星失去了他的女朋友和他的节目也被取消了。
精选初中九年级英语阅读理解专项练习 1、阅读与表达（共5小题；每小题1分，满分5分） 阅读下面短文，在表格内的空白处填入合适的答案（每空一词） Life is short. So live it to the fullest! Love whatever you have to do, thus you will always be able to do what you love and to love what you do. Live each day as if it’s your last! Today is a gift, that’s why it’s called the present. Be present to enjoy the moment. Each day is a fresh start with chances just waiting to be explored, so what are waiting for? Accept everyone. Enjoy the company(陪伴) of others and show interest in their goodness. Don’t judge(评判) others and treat others as you would like to be treated. Be confident. Focus on(集中) good thoughts and good things will happen. Don’t be too hard on yourself. Blaming yourself won’t help anything. Take action to find the cause of any bad thoughts (fear, anger, doubt, hate…). Cancel out(消除) each one with a good thought:“I am brave!”“I know I can do it!”“I forgive and I do not hate!” You may not be feeling your best at the moment, but you will feel better when you think about good things. Enjoy the environment. Take a break sometimes and go for a walk. Take a fresh look at the clouds, the colours of the sky at sunrise and sunset. Look at the plants, trees and how they move when the wind blows. Look at water how it shakes. This exercise will clear off the dead memories that kill the joy of living. Besides, make a list of everything you’ve dreamed of doing and then make it happen. Dreams aren’t achieved by sitting around and waiting. They are achieved by getting up and working for them! Work hard and make your dreams come true. Work hard and play harder! You can always realize your dreams. If you really want something, find a way to achieve it! Be YOU bravely. Don’t be a shy person! You are who you are! Forget what others think and live your life! Do what you want because life is what you make it, and your life is yours! Nobody
通信原理实验指导书思考题答案 实验一思考题P1-4： 1、位同步信号和帧同步信号在整个通信原理系统中起什么作用？ 答：位同步和帧同步是数字通信技术中的核心问题，在整个通信系统中，发送端按照确定的时间顺序，逐个传输数码脉冲序列中的每个码元，在接收端必须有准确的抽样判决时刻（位同步信号）才能正确判决所发送的码元。位同步的目的是确定数字通信中的各个码元的抽样时刻，即把每个码元加以区分，使接收端得到一连串的码元序列，这一连串的码元序列代表一定的信息。通常由若干个码元代表一个字母（符号、数字），而由若干个字母组成一个字，若干个字组成一个句。帧同步的任务是把字、句和码组区分出来。尤其在时分多路传输系统中，信号是以帧的方式传送的。克服距离上的障碍，迅速而准确地传递信息，是通信的任务，因此，位同步信号和帧同步信号的稳定性直接影响到整个通信系统的工作性能。 2、自行设计一个码元可变的NRZ码产生电路并分析其工作过程。 答：设计流程图如下。 提示：若设计一个32位的NRZ码，即要求对位同步信号进行32分频，产生一路NRZ码的帧同步信号，码型调节模块对32位码进行设置，可得到可变的任何32位码型，通过帧同步倍锁存设置的NRZ码，通过NRZ码产生器模块把32位并行数据进行并串转换，用位同步信号进行一位一位输出，循环输出32位可变NRZ码即我们的设计完毕。 实验二思考题P2-4： 1、实验时，串/并转换所需的帧同步信号高电平持续时间必须小于一位码元的宽度，为什么？ 答：如果学生认真思考，可以提出没有必要一定小于一位码元的宽度。如24位的数据在串行移位时，当同步信号计数到第24位时，输出帧信号，通过帧信号的上升沿马上锁存这一帧24位数据，高电平没有必要作要求。主要检查学生是否认真考虑问题。 2、是否还有更好的方法实现串/并转换？请设计电路，并画出电路原理图及各点理论上的波形图。 答：终端模块采用移位锁存的方法实现串/并转换，此方法目前是最好的方法了。 实验四思考题P4-6： 1、在分析电路的基础上回答，为什么本实验HDB3编、解码电路只能在输入信号是码长为24位的周期性NRZ码时才能 正常工作？ 答：因为该电路采用帧同步控制信号，而1帧包含24位，所以当NRZ码输入电路到第24位时，帧同步信号给一个脉冲，使得电路复位。HDB3码再重新对NRZ码进行编译。且HDB3码电路对NRZ进行编译的第一位始终是固定的值。 因此HDB3编译码电路只能在输入信号是码长为24位的周期性NRZ码才能正常工作。但是由于HDB3码很有特点，现在为了使学生更好的观察HDB3如何进行编译码，我们对电路进行了改正，去掉了帧同步控制信号，所以现在对任意位的NRZ码都可以进行编码。 2、自行设计一个HDB3码编码电路，画出电路原理图并分析其工作过程。 答：根据HDB3的编码规则，CPLD电路实现四连“0”的检测电路，并根据检测出来的结果确定破坏点“V”脉冲的加入，再根据取代节选择将“B”脉冲填补进去。原理框图如下： 3
九年级英语阅读理解训练题及答案五(一) Snow fell on the mountain. It snowed and snowed. The snow did not melt（融化）. It became deep and heavy. The snow on the bottom pressed （挤压）together., it became ice. The ice was very wide and thick. It began to move down the mountain. It was like a river of ice. It was a glacier（冰河）. Sometimes the glacier moved only a few inches（英寸） each day. As it moved, it took rocks and dirt with it. It changed the land. In some places, it left hills. In some places, when the glacier melted, it made rivers and lakes. A million years ago, there were many big glaciers. Glaciers covered many parts of the world. The glaciers changed the land. Glaciers are still at work today. A glacier in the north of Canada is cutting a new path（路） down the side of a mountain. This glacier will change the land, too. 1. The snow that fell on the mountain A. became snowman B. melted C. became ice D. turned to rain 2. The word in the story that means a river of ice is __________.
2、人生充满意想不到的。 2001年5月,我找到了一份工作在纽约世界贸易中心。2001年9月11日,我到达建筑在8:30。我正要去当我决定先喝杯咖啡。我去了我最喜欢的咖啡的地方,尽管它是两个街区从我的办公室。当我与其他办公室工作人员排队,我听到一个响亮的声音。 之前我可以加入其他的外面看到发生了什么,第一架飞机已经击中我的办公大楼。我们难以置信地盯着黑烟燃烧的大楼。我感到很幸运的是他还活着。 近10年后,上午10点我醒来2月21日2011年,从来没有意识到我的警报。我跳下床,直奔机场。但是我到达机场的时候,我的飞机到新西兰已经起飞了。“这是第一个假期我已经拍了一年,我错过我的飞机。运气真差!”我心想。 另一架飞机满所以我不得不等到第二天。第二天早上,我听说地震在新西兰的前一天。我的坏运气广告竟然变成了一件好事。 愚人节是一个庆祝活动,发生在世界各地的不同的国家。它发生在每年4月1日,是许多人一天播放各种各样的技巧和笑话。 一个愚人节,英国记者宣布,就不会有更多的意大利面,因为在意大利面条农民停止了意大利面条。许多人跑到当地的超市去买尽可能多的意大利面条。当人们意识到这个故事是一个骗局,全国的所有的意大利面已经卖完了。 另一个在英国著名的技巧是当一个电视节目报道的发现特殊的水。他们说,这些水将帮助人们减肥,一个客户已经失去了很多体重在短短四个月。一天结束的时候,已经有10000多人打电话给电视台找出获得这个水。
许多愚人节笑话可能会不是很有趣。一位著名的电视明星曾经邀请他的女朋友在他的节目在愚人节。他向她求婚。这位女士很高兴,因为她真的很想结婚。然而,当她说“是”,他回答,“四月傻瓜!“这个小笑话没有一个非常幸福的结局。 那个电视明星既失去了他的女朋友和他的节目。世界上最著名的技巧之一,然而,而不是4月10月发生。在1938年的那个月,演员奥森·威尔斯在他的广播节目上宣布外星人从火星落在地上。他描述了他们在哪里降落,并告诉他们如何穿越美国。威尔斯让它听起来如此真实,成百上千的人相信这个故事。当恐惧传遍整个国家的时候警察宣布,这个故事是一个骗局。
实验1 流体流动阻力测定 1. 启动离心泵前，为什么必须关闭泵的出口阀门？ 答：由离心泵特性曲线知，流量为零时，轴功率最小，电动机负荷最小，不会过载烧毁线圈。 2. 作离心泵特性曲线测定时，先要把泵体灌满水以防止气缚现象发生，而阻力实验对泵灌 水却无要求，为什么？ 答：阻力实验水箱中的水位远高于离心泵，由于静压强较大使水泵泵体始终充满水，所以不需要灌水。 3. 流量为零时，U 形管两支管液位水平吗？为什么？ 答：水平，当u=0 时柏努利方程就变成流体静力学基本方程： Z1 P1 g Z2 p2 g, 当p1 p2时, Z1 Z2 4. 怎样排除管路系统中的空气？如何检验系统内的空气已经被排除干净？ 答：启动离心泵用大流量水循环把残留在系统内的空气带走。关闭出口阀后，打开U形管顶部的阀门，利用空气压强使U形管两支管水往下降，当两支管液柱水平，证明系统中空气已被排除干净。 5. 为什么本实验数据须在双对数坐标纸上标绘？答：因为对数可以把乘、除变成加、减，用对数坐标既可以把大数变成小数，又可以把小数扩大取值范围，使坐标点更为集中清晰，作出来的图一目了然。 6. 你在本实验中掌握了哪些测试流量、压强的方法？它们各有什么特点？答：测流量用转子流量计、测压强用U 形管压差计，差压变送器。转子流量计，随流量的大小，转子可以上、下浮动。U 形管压差计结构简单，使用方便、经济。差压变送器，将压差转换成直流电流，直流电流由毫安表读得，再由已知的压差~电流回归式算出相应的压差，可测大流量下的压强差。 7. 读转子流量计时应注意什么？为什么？ 答：读时，眼睛平视转子最大端面处的流量刻度。如果仰视或俯视，则刻度不准，流量就全有
九年级英语课文翻译 unit12 欧阳光明（2021.03.07） Section A 2d 马特：凯文，为什么你今天迟到了？ 凯文：我的闹钟没有响！我一直睡觉，当我醒来时，已经是早上8点了！ 马特：噢！，不！ 凯文：所以我迅速穿上衣服冲出家门。 马特：你没吃早饭吗？ 凯文：没有，我甚至没有刷牙也没有洗脸！但在我到达车站前，汽车已经开走了。 马特：那你是怎么来这儿的？ 凯文：幸运的是，卡尔的父亲看见我在路上，让我打了他的车。 马特：嗯，至少当你到达学校时，上课只迟到5分钟。 Section A 3a 生活充满了意外 2001年5月，我在纽约世贸中心找到一份工作。在2001年9月11日，我大约在早上八点半到达了工作的大楼，这时我决定先买一杯咖啡。我去了我最喜欢的咖啡店，虽然它在我办公室东边的两个街区以外。当我正在和其他办公室工作职员排队等候的时候，听到一
声巨响。我还没来得及加入屋外的人群弄清究竟发生了什么事，第一架飞机已经撞上了我办公室的大楼。我们直愣愣盯着燃烧着的大楼上升起的黑烟，无法相信（这一切）。我觉着我能够活着很幸运。 大约10年之后，2011年2月21日，我早上10：00 醒来意识到我的闹钟根本没响。我从床上跳起来直奔机场。但是当我到达机场时，我飞往新西兰的航班已经起飞了。“这可是我今年的第一个假期，我居然误了航班。真倒霉！”我暗想。其他的航班都已经满员，我不得不等到第二天。（结果）第二天早上,我听到新西兰昨天发生了地震。我的坏运气意想不到变成了一件好事。 Section B 2b 愚人节是一个世界上许多不同国家都进行庆祝的节日。它在每年的四月一日，这是一个许多人会互相开各种玩笑或恶作剧的日子。有一年的愚人节，英国的一位记者宣称因为意大利农民停止种植意大利面条，因此以后将不再有意大利面条了。许多人都跑到当地超市尽可能多地买意大利面。等人们意识到这是一个恶作剧的时候，全国所有的意大利面条都被卖光了。在英国另一个恶作剧中，一电视节目报道发现了一种特殊的水。他们说这种水可以帮助人们减肥，有一位消费者仅四个月就减掉了很多体重。（结果）当天结束之前，超过10,000人打电话到电视台，询问如何得到这种水。 许多愚人节的玩笑的结局并不那么有趣。一位著名的电视明星曾经在愚人节邀请他的女朋友上他的电视节目。他向她求婚。那位女士是如此的高兴因为她真的想结婚了。然而,当她说好的时候，
九年级英语阅读理解训练题及答案五 (一 Snow fell on the mountain. It snowed and snowed. The snow did not melt(融化. It became deep and heavy. The snow on the bottom pressed (挤压together., it became ice. The ice was very wide and thick. It began to move down the mountain. It was like a river of ice. It was a glacier(冰河. Sometimes the glacier moved only a few inches(英寸each day. As it moved, it took rocks and dirt with it. It changed the land. In some places, it left hills. In some places, when the glacier melted, it made rivers and lakes. A million years ago, there were many big glaciers. Glaciers covered many parts of the world. The glaciers changed the land. Glaciers are still at work today. A glacier in the north of Canada is cutting a new path (路down the side of a mountain. This glacier will change the land, too. 1. The snow that fell on the mountain A. became snowman B. melted C. became ice D. turned to rain 2. The word in the story that means a river of ice is __________.
实验一：流体流动形态的观察与测定 1、影响流体流动型态的因素有哪些 主要有流体的物理性质如密度、粘度、流速和流体的温度，管子的直径、形状和粗糙度等。 2、如果管子不是透明的，不能直接观察来判断管中的流体流动型态，你认为可以用什么办法来判断 可通过测试流体的流量求出其平均流速，然后求出Re，根据Re的大小范围来判断。 3、有人说可以只用流速来判断管中流体流动型态，流速低于某一具体数值时是层流，否则是湍流，你认为这种看法对否在什么条件下可以由流速的数值来判断流动型态 这种看法不确切，因为只有管子的尺寸和流体的基本形状确定不变的情况下，此时Re的大小只与流速有关，可以直接采用流速来判断。 实验二柏努利方程实验 1、关闭阀A，各测压管旋转时，液位高度有无变化这一现象说明什么这一高度的物理意义又是什么 关闭阀A，各测压管旋转时，液位高度无变化；液位高度代表各测压点的总能量，即位压头、静压头之和，这一现象说明，流速为0，各点总能量不变，守恒. 2、点4的静压头为什么比点3大 点3的位置较点4高一些，即H3位>H4位,两点的总压头相等, H3静
Unit1 How?can?we?become?good?learners? Section?A??2d? -----安妮，我有点紧张，我必须读完一本书，以便下周一作报告。? -----听起来不太糟糕。? -----但我是一个读书很慢的人。? -----一开始只管快速阅读获取文章大意就好了，不要逐字逐句的读，按词组阅读。? ----但我很多单词都不懂，我不得不用字典。? ----尽量通过阅读上下文来猜测单词的意思，可能你知道的比你预象的要多。? ----那听起来很难!? ----哦，耐心点，这得花时间。你可以每天通过阅读你喜欢的东西得到提高。你读得越多，你(阅读的速度)就越快。 Section?A??3a? 我是如何学会学习英语的 去年，我不喜欢我的英语课。每节课像是一个噩梦。老师说的太快以至于我大多数时候都听不太懂。因为我糟糕的发音，我害怕问问题。我只是躲在我的课本后面，从来不说一句话。? 后来有一天我看了一部叫做《玩具总动员》的英语电影。我爱上了这部既激动人心又滑稽有趣的电影！就这样我也开始看其他的英文电影。虽然我无法听懂那些角色所说的全部内容，但他们的肢体语言和面部表情帮助我理解了意思。我也意识到我可以通过只听关键词来理解意思。通过听英文电影中的对话，我的发音也变的更好了。我发现听一些有趣的内容是学习语言的秘诀。我还学到了一些有用的句子比如“这简直是小菜一碟”或者“你活该”。我起初不理解这些句子，但是因为我想理解这个故事，所以我查了字典。? 现在我真的喜欢我的英语课。我想学习生词和更多的语法，那样我对英语电影就能有更好的理解了。 Section?B??2b? 怎么成为一个成功的学习者呢? 每个人天生就拥有学习的能力。但是你能否学习的好取决于你的学习习惯。研究显示成功的学习者有一些共同的好习惯。? 1.培养他们对所学东西的兴趣? 研究显示，如果你对某事物感兴趣，你的大脑会更活跃而且对你来说长时间地关注那个事物也容易些。善于学习的人经常把他们需要学的事物与一些有趣的事物联系起来。比如，如果他们需要学习英语而且他们喜欢音乐或者体育，他们就可以听英文歌曲或者看英文版的体育节目。这样他们就不会感到乏味了。? 2.练习并从错误中学习?
九年级英语阅读理解12篇 阅读理解1 Mr. Lee was in bed and was trying to go to sleep when he heard the bell ring. He turned on the light and looked at his clock. It was twelve o'clock. "Who can it be at this time of night?" He thought. He decided to go and find out. So he got of bed, put on his dressing gown (浴袍) and went to the door. When he opened the door, there was nobody there. "That is very strange." Then he went back to his bedroom, took off his dressing gown, got back into bed ,turned off the light and tried to go to sleep. A few minutes later he heard the bell again. Mr. Lee jumped out of bed very quickly and rushed to the door. He opened it, but again he found no one there. He closed the door and tried not to feel angry. Then he saw a piece of paper on the floor. He picked it up. There were some words on it : "It is now after midnight(午夜), so it is April Fool's Day (禺人节) . April fool to you!" "Oh , it was the English boy next door!" Mr. Lee exclaimed (惊叫) and almost smiled. He went back to bed and feel asleep at once. The bell did not ring again. 1. When did Mr. Lee go to bed? He went to bed _______. A. before twelve o'clock B. after twelve o'clock C. when the bell rang D. when he saw the boy 2. Why did he rush to the door when he heard the bell ring the second time? A. He wanted to open the door for the visitor B. He wanted to find out who the visitor was. C. He was afraid of the ring
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实验思考题参考答案 实验 Fe(OH)3胶体的制备、破坏、分离 1.常压过滤时滤纸为什么要撕去一角？答：使滤纸紧贴玻璃漏斗，有利于排出滤纸与玻璃漏斗之间气泡，形成液柱。 2.抽滤时剪好的滤纸润湿后略大于布氏漏斗的内径、或剪的不圆周边凸出部分贴在布氏漏斗内壁上，对抽滤有何影响？为什么？答：会造成漏虑。滤纸大于布氏漏斗内径会造成滤纸折叠，不能紧贴布氏漏斗。 3.抽滤时，转移溶液之前为什么要先稍微抽气，而不能在转移溶液以后才开始抽气？答：使滤纸紧贴布氏漏斗，以免造成漏虑。 4. 沉淀物未能铺满布氏漏斗底部、滤饼出现裂缝、沉淀层疏松不实，对抽干效果有什么影响？为什么？如何使沉淀抽得更干爽？答：固液分离效果不好；漏气使压差变小；用药勺铺平、压实沉淀物再抽滤。 由胆矾精制五水硫酸铜 1. 结晶与重结晶分离提纯物质的根据是什么？如果被提纯物质是 NaCl 而 不是 CuSO 4·5H 2O ，实验操作上有何区别？ 答：根据物质溶解度随温度变化不同。NaCl 的溶解度随温度变化很小不能用重结晶的办法提纯，要用化学方法除杂提纯。 2. 结晶与重结晶有何联系和区别？实验操作上有何不同？为什么？ 答：均是利用溶解度随温度变化提纯物质；结晶浓缩度较高（过饱和溶液），重结晶浓缩度较低（饱和溶液），且可以进行多次重结晶。结晶一般浓缩到过饱和溶液，有晶膜或晶体析出，冷却结晶；重结晶是在近沸状态下形成饱和溶液，冷却结晶，不允许浓缩。 3. 水浴浓缩速度较慢，开始时可以搅拌加速蒸发，但临近结晶时能否这样 做？答：搅拌为了加快水分蒸发；对于利用晶膜形成控制浓缩程度，在邻近结晶时不能搅拌。否则无法形成晶膜。 4. 如果室温较低，你准备采用什么措施使热过滤能顺利进行？答：预热漏 斗、分批过滤、保温未过滤溶液。 5. 浓缩和重结晶过程为何要加入少量 H 2SO 4？答：防止防止 Fe 3+水解。
胜利之队 彼得的眼睛盯着地面，当他独自一人走在回家的路上时觉得双肩沉重。今天是他人生中最糟糕的日子。他脑海里总是不停地想一个小时之前发生在学校足球场上的事。他怎么错过那个球呢？他让整个球队失望。他愚蠢的错误使他很生气。他的球队因为他输了那场比赛。他很担心教练会把他开除。 他一走进家门，爸爸就问：怎么了，儿子？”彼得的感觉都写在了脸上，“我输了比赛”彼得回答，然后没说一句话就走进了他的房间。十分钟之后，彼得听到爸爸敲他卧室的门他打开门让他进来。 “看，彼得，我不知道发生了什么，但不管结果怎样不要对自己要求太苛刻。 “我输了比赛，父亲。我让球队输了。他们可能永远不会让我踢球了”。 “足球需要团队合作，你不是你们球队输了的唯一原因，如果你们有一个优秀的球队应该互相支持。除此之外，输赢只是比赛的一半。另一半是学会如何与队友合作并从错误中吸取教训。 彼得没说什么，但是爸爸的话使他陷入了深思。 第二天，皮特并没有害怕，而是勇敢地去参加足球训练。 他对队友们说，“我对昨天的事感到很抱歉，我们几乎要赢得那场比赛，但我想只要我们继续团结一致，我们就会赢得下一场比赛。” 令他惊讶和欣慰的是，他的队友全都赞同地点头。 他们说，“不要担心，那绝不是一个人的错，我们应该考虑如何在下次比赛中做的更好。 彼得笑了，知道在一个走向胜利的团队中使他感到很幸运。 Key Words and Phrases（重点单词和词组）： 1. __________ n. 重量； 2.___________n. 肩；肩膀 3. ______ n. 球门；射门； 4. __________ 使失望________v. 使失望 5. ________ 教练；私人教师 6. __________ 开除某人 7. __________ 对某人苛刻8. _________n.勇敢；勇气 9. ________ n. 轻松；解脱10. _________n. 过失；缺点 11. ________ n. （意见、看法）一致12.__________ 齐心协力；通力合作
2018—2019学年（上）九年级广州第12期Unit 4单元综合能力检测题 答案解析 一、语法选择 1.答案B。本题考查时态。由上一句中的“Last month” 可知此处应用一般过去时，故填saw。 2.答案D。本题考查副词。修饰动词complained要用副 词，故填angrily。 3.答案A。本题考查介词。表示“张贴”用短语put up， 故填up。 4.答案C。本题考查冠词。此处指代前文提到的披萨餐 厅，故填the。 5.答案A。本题考查不定代词。由下文内容可知很多家 长无法控制他们的孩子，且parents为可数名词，故填 many。 6.答案B。本题考查不定代词辨析。此处表泛指“其他 的顾客”，故填other。 7.答案A。本题考查形容词。take good care of 意为“照 顾好”。 8.答案B。本题考查连词。so表因果关系，意为“所以”。 句意：他说餐厅靠近一条繁忙的道路，如果家长不好 好照顾他们的小孩，可能会有一些危险。所以他才下 定决心禁止小孩进入他的餐厅。 9.答案C。本题考查形容词性物主代词。修饰名词要用 形容词性物主代词，故填his。 10.答案D。本题考查情态动词辨析。could意为“能够”。 句意：他们说他们厌倦了餐厅里吵闹的孩子，现在他 们终于能有一个只供大人用餐的地方了。 11.答案A。本题考查副词辨析。此处位于肯定句句中， 故填also。 12.答案C。本题考查时态。and连接两个句子前后时态 一致，前半句用的是现在完成时，后半句也应用现在 完成时，故填have tried。 13.答案B。本题考查介词后接动词-ing形式的用法，故 填solving。 14.答案C。本题考查不定式to do表目的的用法，意为 “为了”，故填to encourage。 15.答案C。本题考查词性及词义辨析。根据句子结构可 知此处应填形容词，且由句意可知这些方法暂时有用，故填useful。 二、完形填空 16.答案A。由后半句中的“because he was always in an old school uniform that didn’t fit him”可知，这位母亲告诉 “我”她的孩子在学校有多糟糕，故填bad。 17.答案C。由后半句中的“they couldn’t afford a new one” 可知，她的丈夫和她都失业了，故填lost。 18.答案B。由上文讲述儿子总是穿着不合身的旧校服， 可知母亲正慢慢努力给他买新的衬衣，故填new。19.答案D。由上一句讲述她不想寻求帮助可知，她从来 没有向“我”要过任何东西，故填never。 20.答案A。由后半句中的“to take out some money”可 知，“我”去了银行，故填bank。21.答案B。由上一句讲述“我”去银行取了一些钱给这 位母亲可知，“我”让她去买校服，故填buy。 22.答案C。由破折号后的“no payback”可知，“我”明 确向她表示“我”没有要求得到任何东西，故填 expected。 23.答案B。由上文讲述作者拿钱帮助这位母亲可知，她 这样做能够享受到帮助别人的乐趣，故填helping。24.答案C。根据语境可知，她感动得说不出话来，于是 我们拥抱在一起，故填moved。 25.答案D。根据语境可知，有了钱买新校服之后，小男 孩就不用再因为他的旧校服而被嘲笑，故填laughed at。 三、阅读 第一节阅读理解 A 【语篇解读】本文的主要内容是Parkrise Flats的居民协会制订了一些简单的规则，希望居民们遵守，让大家能有一个更加舒适和安全的居住环境。 26.答案C。细节理解题。由第一段中的“… so here are a few simple rules which we think all residents should follow.”可知，这篇文章的目的是让所有居民遵守规 则。 27.答案A。细节理解题。由第二段第一句“Rubbish collection is on Tuesdays.”可知，垃圾收集一星期一次。 28.答案D。细节理解题。由第三段第一句“There is a washing line for every flat in the garden next to the car park.”可知，晾衣绳在花园里。 29.答案B。细节理解题。由第六段最后一句“... Association will get in touch with you if you make too much noise.”可知，如果你制造太多噪音，居委会将 会找你谈话。 30.答案B。推理判断题。根据文中内容可知，居委会为 使居民能有一个舒适和安全的居住环境做了很多工 作，可知他们非常乐于帮助居民。 B 【语篇解读】本文主要讲述了Joe利用自己会表演哭泣的才能得到他想要的东西，而Pipo虽然家境贫寒，可是他拒绝了Joe帮他筹集到的钱，他想通过自己的努力去争取。最后Pipo的做法感动了Joe，Joe决定改变原来的方式。31.答案B。细节理解题。由第一段可知，每当Joe想要 某些东西时，他便会通过表演哭泣来得到它。 32.答案C。细节理解题。由第二段第四句“When people offered him some money, he would do something for them in return.”可知，每当人们帮助Pipo时，他便会 做一些事情回报他们。 33.答案D。词义猜测题。由下文中Pipo说的话及“Joe walked away sadly.”可知，Pipo拒绝了Joe帮他筹集 到的钱。由此可推测出，decline意为“拒绝”。 34.答案A。细节理解题。由最后一段第五句“To the joy and surprise of his parents, Joe spent the whole evening
精选九年级中考英语阅读表达专项练习 五、阅读表达（10分） It was Saturday again. Grace and Karen disliked Saturdays. That was another thing the twins had in common. They shared the same clothes and tied their hair in the same manner. In fact, it was hard for their classmates and teachers to tell the difference between them sometimes. Unlike their classmates, they had to get up early at seven every Saturday to prepare for their lessons. Grace had to attend the art lesson and Karen had to attend her ballet lesson. “How I wish I could do something different today,” said the twins with one voice. All at once, an idea came to Grace and Karen at the same time. “What about exchanging our roles for a day?” they asked each other. It seemed like a wonderful plan. After giving each other a description of their own friends, Grace put on Karen’s ballet dress while Karen put Grace’s brushes and paints into her bag. Then they left for their classes. When the art lesson started, Karen was lost. Unlike Grace, Karen was poor at drawing. When the art lesson finally ended, Karen didn’t dare to hand in her work. Meanwhile, Grace had problems in the ballet class as well. As she had no idea about the dance steps, she had to follow her classmates blindly. As a result, she kept knocking into them. Their ballet teacher became impatient with her, “Karen, you should remember the basic steps.” When Karen and Grace got home, they were tired out. They decided that they would never try to be someone else they were not. It seemed that the grass was not always greener on the other side. 根据短文内容回答下面的五个问题，每题答案不超过7个词。 66. When did the twins get up on Saturdays? _______________________________________________________________________________ 67. What was the twins’ plan when they decided to do something different? _______________________________________________________________________________ 68. What do you think of Karen’s art work? _______________________________________________________________________________ 69. Why did the ballet teacher become impatient? _______________________________________________________________________________