21世纪大学实用英语综合练习3第6,7单元的答案

Unit 6

Part Ⅰ

Ⅰ

A. Perseverance guidance attendance reliance resistance assistance endurance insurance

1. endurance

2. assistance

3. reliance

4. insurance

5. resistance

6. attendance

7. perseverance

8. guidance

B. inappropriate inflexible incompetent invisible incurable inattentive inactive insignificant

1. invisible

2. incompetent

3. inactive

4. insignificant

5. incurable

6. inflexible

7. inattentive 8. inappropriate

Ⅱ

1. be qualified for

2. keep on doing sth.

3. to sb’s shock and amazement

4. and even more important

5. cope with

6. a variety of

7. miss out

8. dwell on 9. out of sb’s control 10. apply for

11. be involved in extracurricular activities 12. keep sth. in mind 13. burn one’s bridges

14. feel upset for a bit 15. get back 16. reflect on 17. fill out applications

18. look to (sb/sth) for (sth)

Ⅲ

1-5 F J D A K 6-10 G L C H B 11-17 E I Q O P N M

Ⅳ

SET

1-8 G C E F D B H A

9. set about 10. set off 11. set back 12. set up 13. set out 14. sets aside 15. set upon 16. set to

KEEP

1. keep on

2. keep from

3. keep to

4. keep out

5. keep up

6. keep back

7. keep up with

8. keep down 9. keep from 10. keep on 11. keep…out 12. kept to 13. keep up with

14. keep down 15. kept…up 16. keep back

Ⅵ

Passage 1 : B B C D A

Passage 2: B C D A D

Ⅶ

1. couldn’t stand

2. promote herself

3. friction

4. speaking up

5. concrete details

Part Ⅱ

Ⅱ

1-5 B C D A A 6-10 A B D C B 11-15 C D A B C 16-20 D C C A C 21. unreasonable 22. appropriate 23. stability 24. understood 25. using 26. vacancies 27. inflexible 28. to save 29. would become 30. tastes

Ⅲ

1-6.B A D B C

6.non-native speakers

7.speaking

8.reading

https://www.wendangku.net/doc/0013599409.html,nguage lab 10.Paula Paltridge

ⅣBCDB

Unit 7

Part 1

Ⅰ

weaken straighten sadden ripen tighten lessen broaden widen

deafen quiken darken deepen brighten shorten sharpen

1. tightened

2. quicken

3. saddens

4. shorten

5. brightened / widened

6. deafening

7. lessened

8. straighten

Ⅱ

1. ups and downs

2. a straight-A student

3. hold down two part-time jobs

4. burst out crying for no apparent reason

5. on more than one occasion

6. take one’s own life

7. switch to computer programming

8. job prospects 9. get along with one’s boss 10. not get anywhere

11. psychological counseling center 12. book up in advance

13. It is esti mated that…… 14. the tip of the iceberg

Ⅲ

D I H A C

E B J G F

Ⅳ

get:

1-8 C E H A G D F B

9. got over 10. got into 11. have got off 12. getting along 13. get through

14. get on 15. got down to 16. get together

Put:

1. put off

2. put away

3. put out

4. put up with

5. put on

6. put in

7. put away

8. put ...on

9. put in 10. put ...off 11. put up with 12. put…out

Ⅳ

1. major

2. switched

3. prospects

4. aptitude

5. to

6. difficulty

7. considering 8. sales 9. with 10. stay 11. up

Ⅴ

Passage1: A A C D D

Passage2: A C B B D

Ⅵ

1. too much stress

2. concentrate and focus

3. experiencing stress

4. illness

5. hurting themselves

Part Ⅱ

Ⅱ

1-5 A B D C D 6-10 C D C C A 11-15 A B B D A 16-20 B D C A B 21. Unfortunately 22. anxiety 23. guidance 24. have asked 25. had expected

26. must be painted 27. being rebuilt 28. to get 29. various 30. additional

Ⅲ

C B A C B

6. Thomson & Company

7. Quantity discount

8. sales representative

9. samples 10. reliable

Ⅳ

C A C D

大学物理综合练习题及答案

综合练习题AII 一、 单项选择题（从每小题给出的四个备选答案中，选出一个正确答案，并 将其号码填在题干后的括号内，每小题2分，共计20分）。 1、 关于高斯定理，下面说法正确的是：（ ） A. 高斯面内不包围电荷，则面上各点的电场强度E 处处为零； B. 高斯面上各点的E 与面内电荷有关，与面外的电荷无关； C. 穿过高斯面的电通量，仅与面内电荷有关； D. 穿过高斯面的电通量为零，则面上各点的E 必为零。 2、 真空中有两块互相平行的无限大均匀带电平板，其中一块的电荷面密度为 +σ，另一块的电荷面密度为－σ，两板间的电场强度大小为：（ ） A. 0； B. 023εσ； C. 0εσ； D. 0 2εσ 。 3、 图1所示，P 点在半圆中心处，载流导线旁P 点的磁感应强度B 的大小为：（ ） A. μ0I(r r 2141+π)； B. μ0I(r r 2121+π)； C. μ0I(r r 4141+π)； D. μ0I(r r 4121+π) 。 4、 一带电粒子以速率V 垂直射入某匀强磁场B 后，运动轨迹是圆，周期为T 。若以速率2V 垂直射入，则周期为：（ ） A. T/2； B. 2T ； C. T ； D. 4T 。 5、 根据洛仑兹力的特点指出下列叙述错误的为：（ ） A. 洛仑兹力与运动电荷的速度相垂直； B. 洛仑兹力不对运动电荷做功； C. 洛仑兹力始终与磁感应强度相垂直；D. 洛仑兹力不改变运动电荷的动量。 6、 在杨氏双缝干涉实验中，两条狭缝相距2mm ，离屏300cm ，用600nm 光 照射时，干涉条纹的相邻明纹间距为：（ ） A. 4.5mm ； B. 0.9mm ； C. 3.12mm ； D. 4.15mm 。 7、 若白光垂直入射到光栅上，则第一级光谱中偏离中心最远的光是：（ ） A. 蓝光； B. 黄光； C. 红光 ； D. 紫光。 8、 一束光是自然光和线偏振光的混合光，让它垂直通过一偏振片。若以此入射光为轴旋转偏振片，测得透射光强度最大值是最小值的5倍，那么入射光束中自然光与线偏振光的光强比值为：（ ） A. 2/3； B. 1/5； C. 1/3； D. 1/2。 9、 单缝夫琅和费衍射中，若屏幕上的P 点满足2/5sin λ?=a ，则该点为：（ ） A. 第二级暗纹； B. 第五级暗纹； C. 第二级明纹； D. 第五级明纹。 10、 当加在光电管两极的电压足够高时，光电流会达到一个稳定值，这个稳定 值叫饱和电流。要使饱和电流增大，需增大照射光的：（ ） A. 强度； B. 照射时间； C. 波长； D. 频率 。 二、 填空题（每小题2分，共计20分） 1、 图2所示，半径为R 电流为I 的圆形载流线圈在均 匀磁场B 中所受的磁力矩大小为 。 2、 电量均为+q 的两个点电荷相距2x ，则在这两个点电荷连线中点处的电势为 。 3、 在真空中，半径为R 的孤立导体球的电容为 。 4、 静电场由静止电荷产生，感生电场由 产生。 5、 真空中波长为λ的单色光在折射率为n 的介质中，由a 点传到b 点相位

21世纪大学英语第2册课后翻译标准答案

21世纪大学英语第2册课后翻译答案【Unit1】 1、老伴60多岁中风去世时，那位72岁的退休教授不胜悲痛。无人依靠的生活对他来说将是非常困难的。 When his wife died of a stroke in her sixties the 72-year-old retired professor was overwhelmed by grief. Life would be too difficult for him without anybody to rely on. 2、两位业余画家上个月在伦敦举办了一次个人画展。许多人前去参观，其中包括一些著名的专业画家。 Last month two amateur painters held an exhibition of their pictures in London. Many people went to see it including a few celebrated professionals. 3、当20世纪80年代中期，7名宇航员在“挑战者”号的灾难中遇到困难时，全世界一下子陷入了震惊与悲痛之中。

When seven astronauts died in the Challenger disaster in the mid-1980s it plunged the whole world into shock and grief. 4、在结束了其第二届首相任期之后，她仍积极参与政治事务。当政府遇到困难时，她屡次前来帮忙。 After completing her second prime ministry she remained actively involved in political affairs. She came to the rescue several times when the government was in difficulty. 5、大选失败之后，史密斯博士隐退到一个小村庄，在那里尝试工作。After his failure in the election campaign Dr. Smith retired to a small village where he tried his hand at farming. 6、只要你一辈子不停地努力工作，你在回忆里往事时就会感到心满意足的。 As long as you keep working hard all your life you will recall your past with a glow of satisfaction.

21世纪大学英语第三册课后答案

21世纪大学英语第三册课后答案

课后答案 1单元 TEXT A III https://www.wendangku.net/doc/0013599409.html,pulsory 2.relish 3.confidence 4.consequences 5.incentive 6.henceforth 7.invest 8.perceive 9.passion 10.scheming IV 1.going steady with Richard 2.in time 3.played into his enemy's hands 4.beyond her wildest dreams 5.hung on Michael's every word or hung on Michael's words 6.out of focus 7.feed on 8.the apple of Chris's eye 9.filed into the courtroom 10.poring over their collection V 1.most obvious:gaze,beam,widen 2.most obvious:betray,sigh,frown

3.most obvious:glorious,revelation,stump VI A 1.actress 2.empress 3.goddes 4.mistress 5.waitress 6.lioness 7.priestess 8.heiress B 1.Goddess 2.waitresses,actresses 3.Lionesses 4.mistresses VII a person who is taking an exam 应试者 one to whom something is referred, esp. for decision or settlement 裁判 a person who is appointed to a jo b or position 被任命者 a person who has been forced to leave his country, home, etc. and seek refuge 避难者，难民 the person to whom a letter, etc. is addressed 收件人

21世纪大学英语第一册答案(可编辑修改word版)

21世纪大学实用英语课文翻译及课后答案 Text A 大学——我一生中的转折点 佚名 作为一名一年级新生初进大学时，我害怕自己在学业上搞不好。我害怕独自一人在外，因为我是第一次远离家人。这里周围都是我不认识的人，而他们也不认识我。我得和他们交朋友，或许还得在我要学的课程上跟他 们在分数上进行竞争。他们比我更聪明吗？我跟得上他们吗？他们会接受我吗？ 我很快就认识到，我的生活现在就取决于我自己了。如果我要在学业上取得成功，我就必须制定一份学习计划。 我必须调整花在学习上的时间和花在社交上的时间。我必须决定什么时候上床睡觉，什么时候吃什么，什么时候 喝什么，对什么人表示友好。这些问题我都得自己回答。 开始时，生活有点艰难。我在怎样利用时间上犯了错误。我在交朋友上花的时间太多了。我还在怎样选择大学里 的第一批朋友上犯了一些错误。 然而不久，我就控制住了自己的生活。我做到了按时上课，完成并交上了第一批作业，而且以相当好的成绩通过 了前几次考试。此外，我还交了一些朋友，跟他们在一起我感到很自在，我能把我担心的事告诉他们。我建立了 一种真正属于我自己的常规——一种满足了我的需要的常规。 结果，我开始从一个不同的视角看待我自己了。我开始把自己看作是一个对自己负责也对朋友和家人负责的人。 凡事自己做决定并看到这些决定最终证明是明智的决定，这种感觉很好。我猜想这就是人们所说的“成长”的一 部分吧。 我未来的生活将会怎样呢？在人生的这一阶段，我真的不能确定我的人生之路最终将会走向何方，我真的不知道 在以后的几年中我会做什么。但我知道，我能应对未来，因为我已经成功地跃过了我生命中的这一重要障碍：我 已经完成了从一个依赖家人给予感情支持的人向一个对自己负责的人的过渡。 Practice 5 1. smart 2. succeed 3. shortly 4. managed 5. share 6. fear 7. responsible 8. however 9. enter 10. surrounded 11. handle 12. comfortable Practice 6 1. is up to 2. keep up with 3. under control 4. at first 5. grew up 6. make friends with 7. turned out 8. as a result 9. set up 10. in addition Practice 7 1. how to play the game 2. where I wanted to go 3. whether they would accept him or not 4. what to do and how to do it 5. whom to love and whom not to 6. when he made that decision Practice 8 1. I see Li Ming as my best friend. We share the same hobbies and interests. 2. They looked upon their math teacher as their best teacher. 3. We think of this place as our home. 4. They looked on their college life as their happiest years in their life. Practice 9 1. John is both smart and responsible. He likes to make friends with other people. 2. I have made the decision to compete for the new post. You can compete for it, too. 3. Shortly after the doctor came, he managed to have my father’s illness under control. 4. As freshmen, most of us do not know what college life has in store for us, but we all know that we must do well in our studies. 5. To succeed in college, we must keep up with the other students and set up a routine that meets out needs. 6. Though the assignments last week turned out to be more difficult than I thought, I handed them in on time.

大学物理习题及综合练习答案详解

库仑定律 7-1 把总电荷电量为Q 的同一种电荷分成两部分，一部分均匀分布在地球上，另一部分均匀分布在月球上， 使它们之间的库仑力正好抵消万有引力，已知地球的质量M ＝l024kg ，月球的质量m =l022 kg 。（1）求 Q 的最小值；（2）如果电荷分配与质量成正比，求Q 的值。 解：（1）设Q 分成q 1、q 2两部分，根据题意有 2 221r Mm G r q q k =，其中041πε=k 即 2221q k q GMm q q Q += +=。求极值，令0'=Q ，得 0122=-k q GMm C 1069.5132?== ∴k GMm q ，C 1069.51321?==k q GMm q ，C 1014.11421?=+=q q Q （2）21q m q M =Θ ，k GMm q q =21 k GMm m q mq Mq ==∴2122 解得C 1032.6122 2?==k Gm q ， C 1015.51421?==m Mq q ，C 1021.51421?=+=∴q q Q 7-2 三个电量为 –q 的点电荷各放在边长为 l 的等边三角形的三个顶点上，电荷Q （Q ＞0）放在三角形 的重心上。为使每个负电荷受力为零，Q 值应为多大 解：Q 到顶点的距离为 l r 33= ，Q 与-q 的相互吸引力为 20141r qQ F πε=， 两个-q 间的相互排斥力为 2 2 0241l q F πε= 据题意有 10 230cos 2F F =，即 2 022041300cos 41 2r qQ l q πεπε=?，解得：q Q 33= 电场强度 7-3 如图7-3所示，有一长l 的带电细杆。（1）电荷均匀分布，线密度为+，则杆上距原点x 处的线元 d x 对P 点的点电荷q 0 的电场力为何q 0受的总电场力为何（2）若电荷线密度=kx ，k 为正常数，求P 点的电场强度。 解：（1）线元d x 所带电量为x q d d λ=，它对q 0的电场力为 200200)(d 41 )(d 41 d x a l x q x a l q q F -+=-+= λπεπε q 0受的总电场力 )(4)(d 400020 0a l a l q x a l x q F l +=-+= ?πελπελ 00>q 时，其方向水平向右；00

21世纪大学英语第二册答案

第一单元 Text Comprehension II． 1. It was a military campaign in which many soldiers died. The effects on Churchill were () he lost his political position and he was overwhelmed with grief. 2. He felt so inspired to paint that he was distracted from his personal problems. 3. His sister-in-law?s painting inspired him to try his hand at it; his wife rushed out to buy all the materials he would need; and the wife of Sir John Lavery helped him overcome his fear of the blank canvas. 4. The blank whiteness of the c anvas made him feel he didn?t know where to begin. This nervousness was not typical of Churchill, who was known publicly as a brave and strong-willed person. 5. Churchill was comparing the canvas to an opponent in a fight, and he could now see that he need not fear his “adversary”. 6. He meant that Churchill would have been a great painter, just as he was a great politician. 7. It was his great comfort when the death of his mother was followed quickly by the death of his daughter. 8. Because the judges suspected that it was not painted by an amateur; they were later surprised and delighted because Churchill was not just a famous political figure but also a talented untrained artist. 9. No, she considers that decade an artistically fruitful one. 10. He meant that painting was like a friend who never betrayed or abandoned him. This seems to suggest that he often felt lonely, misunderstood and/or disappointed in his relationship with other people. V ocabulary III. 1.artistic 2.overcome 3.infinite 4.plunged 5.mission 6.camgpain 7.revived 8.distract 9.accustomed 10.retreat 11.precaution 12. disastrous IV. 1. delighted with 2. bore fruit 3. kept Clementine company 4. rely on 5. take refuge 6. awaken people to 7. pay the price 8. chanced upon; dated from 9. tried his hand at 10. fell upon; came to her rescue Word Building V. 1. broadens the mind 2. weakened 3. sweeten Diet Coke 4.hardens 5. strengthen 6. deepen your understanding of the course materiall 7. sharpen the kitchen knives 8. reddened 9. brighten; quickens 10. lightened VI. 1. lucky 2. wealthy 3. tasty 4. icy 5. wavy 6. smelly 7. sleepy 8. noisy (smelly is also plausible) 9. healthy 10. sunny Structure VII. 1. Amazed at the great changes that are taking place in shanghai, many foreign visitors leave

21世纪大学英语读写教程(第三册)

21世纪大学英语读写教程（第三册） Vocabulary III Unit 1 1.Do you think that making music and art compulsory subjects in schools would reduce some children’s enjoyment of them ? 2.Bob’s one of those people who relish risk and danger—he’d be bored in a safe , steady job. 3.Elizabeth is certainly enough to succeed in her career ; she just doesn’t have enough confidence in her own abilities. 4.I’m sorry you’re in trouble , but as you made your decision on your own you’ll just have to face the consequences. 5.Many educators would be delighted to abolish exams , but they also worry that with them there would be too little incentive for students to work hard. 6.The teacher accidentally hit the boy’s hand with an eraser and was henceforth known as “Dead-Eye Bean”. 7.If I had money , I’d invest it all in Internet companies. 8.Psychologists say that our behavior is influenced by many factors too subtle for us to consciously perceive. 9.He’s always had a passion for books. If he could work in library, it would be a dream come true. 10.Look at those three whispering in the corner again ----they’re scheming something , I just don’t know what! Unit2 1. In a healthy relationship, the partner’ strengths and abilities complement each other, rather than being identical. 2. Millions of dollars and lots of famous actors not indispensable to the production of a successful film , but they help!

21世纪大学英语2答案.doc

21 世纪大学英语 2 答案【篇一：《21 世纪大学英语》第二册课后翻译答案】 p class=txt>unit1 老伴60 多岁中风去世时，那位72 岁的退休教授不胜悲痛。无人依靠的生活对他来说将是非常困难的。 when his wife died of a stroke in her sixties, the 72-year-old retired professor was overwhelmed by grief. life would be too difficult for him without anybody to rely on. 两位业余画家上个月在伦敦举办了一次个人画展。许多人前去参观，其中包括一些著名的专业画家。 last month two amateur painters held an exhibition of their pictures in london. many people went to see it, including a few celebrated professionals. 当20 世纪80 年代中期，7 名宇航员在“挑战者”号的灾难中遇到困难时，全世界一下子陷入了震惊与悲痛之中。 when seven astronauts died in the challenger disaster in the mid-1980s, it plunged the whole world into shock and grief. 在结束了其第二届首相任期之后，她仍积极参与政治事务。当政府遇到困难时，她屡次前来帮忙。 after completing her second prime ministry, she remained actively involved in political affairs. she came to the rescue several times when the government was in difficulty. 大选失败之后，史密斯博士隐退到一个小村庄，在那里尝试工作。 after his failure in the election campaign, dr. smith retired to a small village, where he tried his hand at farming. 只要你一辈子不停地努力工作，你在回忆里往事时就会感到心满意足的。 as long as you keep working hard all your life, you will recall your past with a glow of satisfaction. 我们现在必须唤醒人们认识到环境保护的重要性。否则很快就为时太晚了。we must awaken people to the importance of environmental protection, or it will be too late. 那位官员因卷入一件政治丑闻而被撤职。如果早知会落到这般地步，他当初也许就会以不同的方式行事了。

大学物理综合练习册答案

《大学物理》综合练习(一)参考答案 一、选择题 1．D ；2．D ；3．C ；4．C ；5．C ；6．C ；7．B ；8．A ；9．D ；10．D 。 二、填充题 1．m /s 2-；s 2；m 3；m 5。 2．j t i t ? ?)3 12()1(32+++；j t i ??22+。 3． v h l h 2 2 -。 4．2m/s 8.4；2m/s 4.230。 5．m t kv mv t v +=00 )(；x m k e v x v -=0)(。 6．J 18-。 7．rg v π16320；3 4。 8．R GMm 6- 。 9．θsin 2gl ；θsin 3mg ； θsin 2g ；θcos g 。 10．j mv ?2-；j R mv ? π22-。 11．v M m m V +-。 12．m 3.0。 13．100 r r v ；2 0212 121mv mv -。 三、计算题 1．(1) j t i t r ??? )1(342++=；j t i t v ???346+=；j t i a ???2126+=。 (2) j t i t r r r ??? ??42013+=-=?。 (3) 19 2 +=x y 。 2．(1) ? -=+ =t t t a v v 02 01d ，3003 1 3d t t t v x x t -+=+=? 。 (2) 0=v 时s 1=t ，该时刻2m/s 2-=a ，m 3 2 3=x 。 (3) 0=t 时m 30=x ，0=v 时(相应s 1=t )m 32 31=x ，m 3 201=-=?x x x 。 3．(1) ??? ??==-=-332 2211a m g m a m g m T a m T g m μμ 解得 ??? ????=====+-=23232 2121m/s 96.12.0m/s 88.56.0g g m m a g g m m m m a μμ

21世纪大学英语(第一册)课后翻译答案

Unit 1 1. 汤姆是个非常好奇的男孩，他不仅对“是什么”感兴趣，而且也对“为什么”和“怎么会”感兴趣。 As a very curious boy, Tom is interested not only in whats but also in whys and hows. 2. 据史密斯教授说，幸福就是你能充分利用你所有的一切。 Happiness, according to Prof. Smith, is the ability to make the most of what you have. 3. 你最好把这本书放在你15岁儿子找不到的地方。 You’d better keep the book where your 15-year-old son can’t get his hands on it. 4. 这故事非常滑稽，比尔一边读一边不停地笑。 The story was so funny that Bill kept laughing all the time while reading it. 5. 成绩优秀的学生未必比他们得分较低的同学在学习上花费更多的时间。 High-achieving students do not necessarily put in more time on their studies than their lower-scoring classmates. 6. 你是怎样设法说服这些学生修读快速阅读课的？ How did you manage to persuade these students to take the speed-reading course? 7. 用功是重要的，但知道如何充分利用自己的才能更重要得多。 Work ing hard is important, but knowing how to make the most of one’s abilities counts for much more. 8. 她要求学生独立思考，而不是告诉他们该思考什么。 She asked her students to think for themselves rather than telling them what to think. Unit 2 l. 在谈及美国英语和英国英语的差别时，他说：“美国和英国毕竟是两个不同的国家。”Referring to the differences between American English and British English, he said, “The United States and Britain are, after all, two different countries.” 2. 史密斯教授鼓励他的学生独立思考。他常说：“即使你们对我提出质疑或者完全不同意我的看法，我也同样高兴。” Prof. Smith encourages his students to think for themselves. “I am just as happy,” he often says, “even if you challenge me or completely disagree with me.” 3. 我们请他参加我们关于流行音乐的谈话，但他一参加进来就引入一个新的话题，谈起了上周的NBA决赛。 We called on him to take part in our conversation about pop music, but as soon as he joined in, he introduced a new topic and referred to the NBA finals of the previous week. 4. 司机应对这次事故负责。他的车撞倒了一棵树和一个骑车的人。 The driver is responsible for this accident. His car knocked down a tree and a man on his bike. 5. 自我们的收音机停止生产后，我们已转产移动电话。 Since our production of radios came to a halt, we have switched to the production of mobile phones.

21世纪大学英语(第四册)课后答案及课文翻译

21 世纪大学英语读写教程（第四册）课后答案 TEXT A II 1.He defines greatness as the lasting contribution which a person makes or has made to human civilization. 2.The example of Churchill shows the importance of persistence and dedication in achieving greatness. 3.Firstborns and only children tend to make good leaders in times of crisis, but middle- born children are better peacetime leaders. 4.A 20th century politician should be an effective public speaker and a social person. 5.Intelligence seems to be less important than other factors, such as the ability to communicate effectively. 6.The ability to overcome traditional ways of thinking is also crucial. 7.They simply don’t devote the amount of time required. 8.The study showed that enjoying one ’ s work is the best form of motivation. 2 IV 1.chat 2.acknowledge 3.motivated 4.charcteristic 5.despite 6.influential 7.cited 8.obstacle 9.intrinsic 10.criteria 11.obsession 12.innate 13.contribution(s) 14.contemporary 15.submitted 16.morale V 1.left behind 2.rise 3.made history 4.were endowed with 5.put up with 6.going nowhere 7.ifocuses on 8.be built on 9.put in https://www.wendangku.net/doc/0013599409.html,e up with 11.take charge 12.set...apart

21世纪大学生英语第三册课后翻译

21世纪大学英语读写教程(第三册)课后句子翻译答案(Unit 1~7) Unit 1 l汤姆去年转来我校，他全神贯注地听杨小姐上课并很快成了她最喜欢的学生。Tom (was) transferred to our school last year. He hung no Miss Y oung’s every word in class and soon became the apple of her eye. 2看到女儿高中毕业，他感到一阵难以弄语言表达的爱和骄傲。 Seeing his daughter graduate from high school, he felt a surge of love and pride that he couldn’t express in words. 3当李先生去年开始涉足股市时，他做梦也没想到会变成百万富翁。 Last year when Mr. Li first began his venture into the stock market, becoming a millionaire was beyond his wildest dreams. 4在休假日，我有幸看到一些野生海豹在吃鱼。我拍了几张照片，可惜焦点都没对准。 On my holiday, I was lucky enough to witness some wild seals feeding no fish. I took several photos of them, but unfortunately they were all out of focus. 5王子跟那位女演员保持确定的情侣关系已三年。没有任何东西能改变他们在下周结婚的决定。 The prince has been going steady with the actress for three years and nothing can alter their plan to get married next week. 6因为穷人连饭都吃不饱便认为他们不需要义务教育的看法完全是一种错误的想法。没有教育人们怎能克服贫穷？ It is a complete misconception that the poor do not need compulsory education because they do not even have enough to feed on. Without education, how can people ever overcome their poverty? 7大卫所有的同班同学都困惑不解——没有人想得出他怎么突然变成了优等生。All of David’s classmates are completely stumped—no one can work out how he became a top student overnight.

7大学物理习题及综合练习答案详解

7大学物理习题及综合练习答案详解 -CAL-FENGHAI-(2020YEAR-YICAI)_JINGBIAN

库仑定律 7-1 把总电荷电量为Q 的同一种电荷分成两部分，一部分均匀分布在地球上，另一部分均匀 分布在月球上，使它们之间的库仑力正好抵消万有引力，已知地球的质量M ＝ 5.98l024kg ，月球的质量m =7.34l022kg 。（1）求 Q 的最小值；（2）如果电荷分配与质量成正比，求Q 的值。 解：（1）设Q 分成q 1、q 2两部分，根据题意有 2 221r Mm G r q q k =，其中041πε=k 即 2221q k q GMm q q Q += +=。求极值，令0'=Q ，得 0122=-k q GMm C 1069.5132?== ∴k GMm q ，C 1069.51321?==k q GMm q ，C 1014.11421?=+=q q Q （2）21q m q M = ，k GMm q q =21 k GMm m q mq Mq ==∴2122 解得C 1032.6122 2?==k Gm q ， C 1015.51421?==m Mq q ，C 1021.51421?=+=∴q q Q 7-2 三个电量为 –q 的点电荷各放在边长为 l 的等边三角形的三个顶点上，电荷Q （Q ＞0）放 在三角形的重心上。为使每个负电荷受力为零，Q 值应为多大？ 解：Q 到顶点的距离为 l r 33= ，Q 与-q 的相互吸引力为 20141r qQ F πε=， 两个-q 间的相互排斥力为 2 2 0241l q F πε= 据题意有 10 230cos 2F F =，即 2 022041300cos 41 2r qQ l q πεπε=?，解得：q Q 33= 电场强度 7-3 如图7-3所示，有一长l 的带电细杆。（1）电荷均匀分布，线密度为+λ，则杆上距原点x 处的线元d x 对P 点的点电荷q 0 的电场力为何？q 0受的总电场力为何（ 2）若电荷线密度λ=kx ，k 为正常数，求P 点的电场强度。 解：（1）线元d x 所带电量为x q d d λ=，它对q 0的电场力为 200200)(d 41 )(d 41 d x a l x q x a l q q F -+=-+= λπεπε q 0 图7-3 a λ l P x q -q -q -l l r Q r r

21世纪大学英语3课后答案

第二版新视野大学英语读写教程第三册uni1答案 1. No matter how experienced a speaker you are, and how well you have prepared your speech, you will have difficulty making a speech at such a noisy reception. 2. Just as all his sister’s friends cared about him, Jimmy cared about them. 3. Car manufacturers stamp a vehicle identification number at several places on new cars to help track down stolen vehicles. 4. If you dare tell on me when the teacher gets back I won’t say a word to you any more. 5. Some elderly people prefer to live on their own while the great majority choose to live with their children. 6. Here is something that needs to be reckoned with: how to get the necessary finances to establish the company. 1. 每当有人帮了你，无论事情大小，无论他地位高低，你都应该对他说声“谢谢”。 2．蒸汽机的发明使船舶发生了变化，正如其已经改变了陆地运输一样。 3．尽管经理努力帮忙，他还是不能找到问题的根源所在。 4．这个女孩的生活天天围着哥哥转，完全明白该做什么来使哥哥高兴。 5．如果你不知道自己想要什么，你最终得到的可能都是自己不想要对。 6．吉米有他妹妹帮助他度过那些没有父亲的艰难日子。 第二版新视野大学英语读写教程第三册unit2答案 1. The defendant, a woman of only 30, kept insisting on her own innocence. 2. All tings considered, dates, beans and some leafy green vegetables are the best sources of iron. 3. No beverages are served with meals because they interfere with digestion. 4. Taking the popularity of the region into consideration, it is advisable to book hotels in advance. 5. If you have a feeling of wanting to throw up after taking this drug, stop taking it immediately and consult your doctors as soon as possible. 6. Summing up the discussion, he said both parties should consider the most effective way to solve the problem. 1. 作为补救缺铁的一种方法，专家推荐食用肉、鸡和鱼，它们是最好的铁质来源，也是唯一最容易被身体吸收的铁质来源。 2．铁质储量为零时，你会觉得虚弱，疲乏无力，喘不过气，这是缺铁第三阶段的典型症状。 3. 耐力运动员，尤其是女性，经常会缺铁，如果增食肉类食物或服用铁质补剂，能够恢复到健康状态。 4．这位运动医学专家认为，感到劳累、工作效率差的人，最好食用牛肉、羊肉，它们含有最易被吸收的铁质。 5．铁质储量低的人应该去咨询医生，看看是否应通过调整饮食或服用铁质补剂来校正不足。 6．一般说来，如果你忽视自己摄入的铁质含量，不在铁质储备失去之前注意警告信号，你会有危险。 第二版新视野大学英语读写教程第三册uni3答案