新编英语语法教程(第五版)答案

《新编英语语法教程》答案

Ex. 1A

1. A. his home work

B. quickly, to play

2. A. The huge black horse

B. the race

3. A. have thought about

B. going into space

4. A. warms up and crawls

B. out of the bag

5. A. one of the most beautiful planets to look at through a telescope

B. because of the many rings that surround it

6. A. 165 years

B. to complete its path, or orbit,around the sun

7. A. you and your brother

B. How many pairs of shorts

8. A. the most expensive meal listed on the menu

B. What

9. A. an “Outdoor Code”

B. their members

10. A. can blow

B. as fast as 180 miles (290 kilometers) an hour

11. A. The spiral of heated air and moist air

B. to twist and grow and spin

12. A. The direction a hurricane’s spiral moves

B. counterclockwise

13. A. does not shine

B. At the north pole: for half of the year

14. A. The cold winds that blow off of the Arctic Ocean

B. a very cold place

15. A. might have been

B. guilty of murder

Ex. 1B

1. SVC

Within the stricken area, not a single soul remained alive, and the city centre looked as if it had been razed by monster steam-roller.

2. SV

The bomb exploded 1,000 ft. above the groun.

3. SVO

On August 6, 1945, an American aircraft dropped a bomb on the Janpanese town of Hiroshima.

4. SvoO

Three days later, yet another bomb of the same kind gave the town of Nagasaki the same fatal blow.

5. SVOC

The explosion made one and a half square miles of the city an expense of reddish rubble.

6. SVA

Within the fraction of a second, the bomb changed from a metal cylinder into an immense mass of enpanding gas, millions of degrees hot.

7. SVOA

A tremendous blast of hot air whirled the debris of stone, cencrete, metal, and wood over the ground.

Ex. 1C

1. Walden Pond, once praised by Thoreau for its natural beauty, is now the site of many tourist stands.

2. Almost every summer night the cooling northeast wind swept through our bedroom windows, marking air conditioning unnecessary and a light blanket welcome. / Swepping through our bedroom windows almost every summer night, the cooling northeast wind made…

3. The steep surrounding slopes were capped with snow, which fed two streams plunging down to join in the valley below.

4. With the river on one side and a large tree providing shade, this is a good spot for a picnic, and we can spread our

blanket on the grassy knoll.

5. Panting for breath after running up the stairs, Mr wood stood at his neighbour’s door and knocked again and again till someone opened it.

6. The town folk envied horace, who had come into a small fortune with which he bought a big house and obtained a partnership in the biggest grocery in town.

7. Standing in front of the mirror, Jim looked at his image, wondering at the big change that had come over him in recent years.

8. The idea that his only daughter whom he had greatly wronged might never forgive him almost drove hime mad.

9. The story, written in plain language, consists of three parts with an interesting plot centering round an aristocratic family living in 17th century France.

10. Mud-covered and shivering, John sat hunched over a bowl of hot broth prepared by his father to drive off the chill.

11. Far above the waters of a beautiful lake and over the tops of the tall pime trees growing on the steep of a hill stand five Chinese-style pavilions.

12. Farther down the street, the old man stopped and leaned against a lamp-post, listening to a cheerful song coming out of a restaurant on the oppsite side of the street.

13. Sarah sank in the nearest chair, completely exhausted, her limbs stiff with cold, her mind a piece of blank.

14. Throughout the day Mrs Rymer behaved very properly, her pleasant, refined face wearing a grave look, her elegant figure wrapped in deep mourning while occasionally she uttered a sigh or a sob.

15. Tony thought it necessary to break the news to his family, that Mr Jacob, his former employer, had promised him a half-day job at 20 pounds a week.

16. The thought that he might have wronged his friend who had rendered him good services on many occasions troubled his mind, already overburdened with worries and cares.

17. The men of the disbanded royal bodyguard, suddenly turned loose onto the street of a capital seething with unrest, unemployed and perhaps disgruntled at their abrupt dismissal, were a potentially dangerous element.

18. For many years London has been a business centre with hotel accommadation for visiting businessmen toghter with well-to-do travellers but completely inadequate for the swarms of shour-stay tourists landing at Heathrow or disembarking at Dover.

19. Nearing the top, he climbed recklessly faser and faster, his eyes already glowing with triumph, but suddenly he slipped and fell, tumbling to the ground and lying motionless there, a crumpled pile of arms and legs.

20. Bertrand Russell was one of the very few persons who have received both the Order of Merit, which was conferred on him

by the British government in 1949, and the Nobel Prize for literature, conferred in Norway in 1950.

新编英语语法教程第02讲练习参考答案

Ex. 2A

1. come

2. are

3. has / have

4. are

5. are

6. are

7. was / were

8. is

9. costs 10. were 11. are 12.

are 13. was 14. are 15. lie 16. were 17. are 18.

is 19. is 20. was 21. Has 22. were 23. is 24. is 25. are 26. is 27. are 28. cover, are 29. is / are 30. was/were

Ex. 2B

1. were

2. have

3. is, is

4. was

5. were

6. is

7.

is 8. are 9. is 10. are, are

11. have 12. are, their, their 13. was, It, was 14, It

/ They, is / are 15. are, their, they, disapprove 16. were,

they 17. was 18. are 19. were 20. were

新编英语语法教程第03讲练习参考答案

Ex. 3A

1. is

2. was

3. is

4. has

5. were

6. means

7. is

8. is

9. is 10. is 11. were 12. sells 13. is 14. are 15. are 16. are 17. is 18. is 19. was 21. are 22. was 23. stops 24. is 25. is 26. does 27. produces 28. is 29. is 30. was

Ex. 3B

1. ’s

2. are

3. is

4. are

5. is

6. was

7. is

8. were

9. is 10. ’s 11. is 12. is, is, is 13.

are 14. is 15. have 16. is 17. are 18. looks 19.

are 20. are 21. understand 22. has 23. was 24. have 25. was 26. was 27. are 28. is 29. is 30. was 31. is 32. is / are 33. leaves 34. is / are 35. are 36. are 37. is 38. comes 39. is 40. live 41. are 42. points / point 43. are 44. is 45. are 46. was 47. is / are 48. is 49. has 50. was

Ex. 3C

1. is / are

2. is / are

3. is

4. is / are

5. is / are

6. remain

7. is

8. are

9. has / have / cares 11. is 12. plays 13. is 14. am 15. are / is 16. was 17. is, has 18. was 19. come 20. is

新编英语语法教程第04讲练习参考答案

Ex. 4A

1. description

2. arrangement

3. attendance

4.

peculiarity 5. expectation 6. argument

7. dependence 8. originality 9. exaggeration 10. measurement 11. purity 12. persistence 13.

extension 14. statement 15. generosity 16. entrance

17. loneliness

18. forgetfulness 19. happiness 20. seriousness

Ex. 4B

1. strange sounds

2. foods are

3. chief,

tribes, their, salmon (s)

4. The runners-up were given pound notes / The runners-up

were each given a pound note.

5. bodies, their heroes

6. mice, tooth-marks

7. Crises, occur, families

8. / 9. / 10. these businesses 11. /

12. fruits are

13. / 14. these articles are well written 15. /

16. several personal kindnesses

17. / 18. sufferings 19. professors 20.

children are playing, sands

Ex. 4C

1. experience

2. waters

3. for advice

4. an important

piece of information 5. for it is fun

6. were not numerous

7. Poultry

8. directors are

9.

militia 10. geniuses 11. merchandise has 12. sympathies 13. experiences 14. were times, rivalry 15. clippings, were 16. lookers-on 17. foliage is 18.

photos 19. 12-pages 20. Luggage is

Ex. 4D

1. blade

2. piece

3. choir

4. flash

5. lump

6. gang

7. grain 8. head 9. staff 10. collection 11. fleet

12. cluster 13. bundle 14. bunch 15. team 16. piece

17. ear 18. bar 19. herd 20. pack 21. flock 22.

crowd / swarm 23. troupe 24. bench 25. grove 26.

collection 27. suite 28. squadron 29. band 30.

library

Ex. 4E

1-5 BCADC 6-10 CBDAB 11-15 ADBBC 16-20 BDCAB

新编英语语法教程第05讲练习参考答案

Ex. 5A

1. my father has a car

2. the bull has horns

3. the prisoner escaped

4. her parents consented

5. somebody released the prisoner

6. somebody assassinated the President

7. a letter from the general / the general sent a letter

8. the crowd felt sympathy

9. a college for women

10. a summer day, a day in the summer

11. the earth has a (rough) surface

12. the absence lasted ten days

13. a doctoral degree, a doctorate

14. the bird made the nest

15. the committee made a report

16. a story told by the girl / the girl told a story

17. the volcano erupted

18. the victim had courage / the victim was courageous

19. somebody punished the boy

20. the critics recevied the play in a hostile manner

Ex. 5B

1. The comedian performed, and he was well received by

a huge audience.

这位喜剧演员的演出很受广大观众的欢迎。

新编英语语法教程(第6版)练习参考答案

新编英语语法教程（第6版）第21讲练习参考答案Ex. 21A was sorry to learn… will be sad to hear… would be very surprised to receive… is happy to have found… was afraid to go… was pleased to hear… am very anxious to meet you. were delighted to receive your telegram. were sensible to stay indoors. clerk was prompt to answer the call. rule is easy to remember. are reluctant to leave this neighbourhood. house is difficult to heat. you ready to leave would be foolish to go out in this weather. is quick to see the point. is very keen to get on. are proud to have him as a friend. was rude not to answer your letter. are happy to have you with us this evening. Ex. 21B decision to resign surprised all of us. showed no inclination to leave.

光学教程答案(第五章)

1. 试确定下面两列光波 E 1=A 0[e x cos （wt-kz ）+e y cos （wt-kz-π/2）] E 2=A 0[e x sin （wt-kz ）+e y sin （wt-kz-π/2）] 的偏振态。 解 ：E 1 =A 0[e x cos(wt-kz)+e y cos(wt-kz-π/2)] =A 0[e x cos(wt-kz)+e y sin(wt-kz)] 为左旋圆偏振光 E 2 =A 0[e x sin(wt-kz)+e y sin(wt-kz-π/2)] =A 0[e x sin(wt-kz)+e y cos(wt-kz)] 为右旋圆偏振光 2. 为了比较两个被自然光照射的表面的亮度，对其中一个表面直接进行观察，另一个表面 通过两块偏振片来观察。两偏振片透振方向的夹角为60° 。若观察到两表面的亮度相同，则两表面的亮度比是多少已知光通过每一块偏振片后损失入射光能量的10%。 解∶∵亮度比 = 光强比 设直接观察的光的光强为I 0, 入射到偏振片上的光强为I ，则通过偏振片系统的光强为I'： I'=(1/2)I (1-10%)cos 2 600 ?(1-10%) 因此： ∴ I 0/ I = ×(1-10%)cos 2 600 ?(1-10%) = %. 3. 两个尼科耳N 1和N 2的夹角为60° ，在他们之间放置另一个尼科耳N 3，让平行的自然光通过这个系统。假设各尼科耳对非常光均无吸收，试问N 3和N 1 的偏振方向的夹角为何值时，通过系统的光强最大设入射光强为I 0，求此时所能通过的最大光强。 解： 20 1 I I = Θ

新编英语语法教程

导论———语法层次 0.1 词素 1）自由词素 2）粘附词素 0.2 词 1）简单词、派生词、符合词 2）封闭词类和开放词类 0.3 词组 1）名词词组 2）动词词组 3）形容词词组 4）副词词组 5）介词词组 0.4分句 1）独立分句和从属分句 2）简单分句和复杂分句 3）主句和从句 4）限定分句、非限定性分句、无动词分句0.5 句子 1）完全句和不完全句 2）简单句、并列句、复杂句、并列复杂句 第1讲句子结构 1.1 主谓结构和句子分析 1）主语和谓语 2）句子分析 1.2 基本句型及其转换与扩大 1）基本句型 2）基本句型的转换与扩大 第2讲主谓一致（一） 2.1指导原则 1）语法一致 2）意义一致和就近原则 2.2 以-s 结尾的名词作主语的主谓一致问题1）以-s结尾的疾病名称和游戏名称 2）以-s结尾的学科名称 3）以-s结尾的地理名称 4）其他以-s结尾的名词 2.3 以集体名词作主语的主谓一致问题 1) 通常作复数的集体名词 2）通常作不可数名词的集体名词 3）既可作单数也可作复数的集体名词 4）a committee of 等+复数名词

第3讲主谓一致（二） 3.1 以并列结构作主语的主谓一致问题 1）由and/both... And 连接的并列主语 2）由or/nor/either...or 等连接的并列主语 3）主语+as much as 等 4）主语+as well as 等 3.2 以表示数量概念的名词词组作主语的主谓一直问题1）以表示确定数量的名词词组作主语 2) 以表示非确定数量的名词词组作主语 3.3 其他方面的主谓一致问题 1）以名词性分句作主语的主谓一致问题 2）以非限定分句作主语的主谓一致问题 3）关系分句中的主谓一致问题 4）分裂句中的主谓一致问题 5）存在句中的主谓一致问题 第4讲 4.1 名词分类和名词词组的句法功能 1）名词分类 2）名词词组的句法功能 4.2 名词的数 1）规则复数和不规则复数 2）集体名词、物质名词、抽象名词、专有名词的数4.3 单位词 1）一般表示个数的单位词 2）表示形状的单位词 3）表示容积的单位词 4）表示动作状态的单位词 5）表示成双、成对、成群的单位词 第5讲 5.1 名词属格的构成、意义和用法 1）名词属格的构成 2）名词属格的意义 3）名词属格的用法 5.2 独立属格和双重属格 1）独立属格 2）双重属格 第6讲限定词（一） 6.1限定词与三类名词的搭配关系 1）能与三类名词搭配的限定词 2）只能与单数名词搭配的限定词 3）只能与复数名词搭配的限定词

光学教程习题解答

《光学教程》（姚启钧）习题解答 第一章 光的干涉 1、波长为500nm 的绿光投射在间距d 为0.022cm 的双缝上，在距离180cm 处的光屏上形成干涉条纹，求两个亮条纹之间的距离。若改用波长为700nm 的红光投射到此双缝上，两个亮纹之间的距离为多少？算出这两种光第2级亮纹位置的距离。 解：1500nm λ= 改用2700nm λ= 两种光第二级亮纹位置的距离为： 2、在杨氏实验装置中，光源波长为640nm ，两狭缝间距为0.4mm ，光屏离狭缝的距离为50cm ，试求：⑴光屏上第1亮条纹和中央亮纹之间的距离；⑵若P 点离中央亮纹为0.1mm 问两束光在P 点的相位差是多少？⑶求P 点的光强度和中央点的强度之比。 解：⑴ 7050640100.080.04 r y cm d λ-?= =??= ⑵由光程差公式 ⑶中央点强度：2 04I A = P 点光强为：2 21cos 4I A π?? =+ ?? ? 3、把折射率为1.5的玻璃片插入杨氏实验的一束光路中，光屏上原来第5级亮条纹所在的位置变为中央亮条纹，试求插入的玻璃片的厚度。已知光波长为7610m -? 解： 1.5n =，设玻璃片的厚度为d 由玻璃片引起的附加光程差为：()1n d δ'=- 4、波长为500nm 的单色平行光射在间距为0.2mm 的双缝上。通过其中一个缝的能量为另一个的2倍，在离狭缝50cm 的光屏上形成干涉图样，求干涉条纹间距和条纹的

可见度。 解： 7050500100.1250.02 r y cm d λ-?= =??= 由干涉条纹可见度定义： 由题意，设22 122A A = ，即 1 2 A A = 5、波长为700nm 的光源与菲涅耳双镜的相交棱之间距离为20cm ，棱到光屏间的距离L 为180cm ，若所得干涉条纹中相邻亮条纹的间隔为1mm ，求双镜平面之间的夹角 θ。 解：700,20,180,1nm r cm L cm y mm λ===?= 由菲涅耳双镜干涉条纹间距公式 6、在题1.6 图所示的劳埃德镜实验中，光源S 到观察屏的距离为1.5m ，到劳埃德镜面的垂直距离为2mm 。劳埃德镜长40cm ，置于光源和屏之间的中央。⑴若光波波长500nm λ=，问条纹间距是多少？⑵确定屏上可以看见条纹的区域大小，此区域内共有几条条纹？（提示：产生干涉的区域P 1P 2可由图中的几何关系求得） 解：由图示可知：7 050050010,40.4, 1.5150nm cm d mm cm r m cm λ-==?==== ①70150500100.018750.190.4 r y cm mm d λ-?= =??== ②在观察屏上可以看见条纹的区域为P 1P 2间 即21 3.45 1.16 2.29P P mm =-=，离屏中央1.16mm 上方的2.29mm 范围内可看见条纹。 P 2 P 1 P 0 题1.6图

新编英语语法教程第六版练习参考答案

新编英语语法教程（第六版）第02讲练习参考答案 Ex. 2A 1. SVC Within the stricken area, not a single soul remained alive, and the city centre looked as if it had been razed by monster steam-roller. 2. SV The bomb exploded 1,000 ft. above the ground. 3. SVO On August 6, 1945, an American aircraft dropped a bomb on the Japanese town of Hiroshima. 4. SvoO Three days later, yet another bomb of the same kind gave the town of Nagasaki the same fatal blow. 5. SVOC The explosion made one and a half square miles of the city an expense of reddish rubble. 6. SV A Within the fraction of a second, the bomb changed from a metal cylinder into an immense mass of expanding gas, millions of degrees hot. 7. SVOA A tremendous blast of hot air whirled the debris of stone, concrete, metal, and wood over the ground.

新编英语语法教程期末考试试卷

大学英语语法模拟试题 1. Mr. and Mrs. Burns feel more comfortable on a ship than they would be if they ______________any other way. A. would travel B. travelled C. are travelling D. have travelled 2. We______________ that Jim be there. A. hope B. wish C. expect D .ask 3. Lucy is glad she didn’t stay on the farm. She______________ bored. A. may be B. will be C. could be D. might have been 4. The dean of studies would have come to see you had it been possible, but he ______________so busy then. A. had been B. was C. were D. would be 5. They would certainly have come and helped us ______________time. A. did they have B. had they had C. had they have D would they have 6. If you were in better health, we______________ you to join in the work last week. A. would have allowed B. would allow C. should allow D. had allowed 7. She cried for her______________ lover. A. departed B. being departed C. departing D. having departed 8. ______________ in an important examination, one of the students in his class lost interest in his work A. Failing B. Failed C. Having been failed D. Having Failed 9. If it______________ tomorrow, I’ll stay at home. A. rained B. will rain C. had rained D. rains 10. “It’s getting very late.”“Yes, it’s time______________.” A. that we left B. we leave C. we’ll leave D. we have left a bus to go there, but he preferred to walk.

《新编英语语法教程》语法术语精编

《新编英语语法教程》主要章节语法术语Introduction: Grammatical Hierarchy (导论—语法层次) 2. Parts of speech (word class) 3. Phrases 词组 4. Clause 分句 5. Sentence 句子 1. Morpheme 词素 Free morpheme 自由词素 Bound morpheme 粘附词素 Allomorph 词素变体 Noun phrase Verb phrase Adjective phrase Adverb phrase Preposition phrase Conjunction

Lecture 1 Sentence Structure（L1）Sentence elements: S (subject) 主语V (predicate verb) 谓语动词 O (object) 宾语 C (complement) 补足语 A (Adverbial) 状语 1. Two ways of sentence analysis 1) SVO Sentence Clause NP VP NP Subject Predicate verb Object All the man have done their best. Sentence = Subject + Predicate (Predicate Verb + Object, Complement, Adverbial, etc.) ●句子由主语和谓语构成，进一步把谓语剖析为谓语动词、宾语、补语、状语等。 2) Subject + Predicate (= operator + predication) Sentence Clause Subject Predicate Operator Predication All the man have done their best. ●句子由主语和谓语构成，进一步把谓语剖析为操作词（operator）和述谓成分（predication）。 2. Basic clause types SVC, SV, SV A, SVO, SVOA, SVOC, SV oO Lecture 2 Subject-Verb Concord （L2-3） Guiding principles: Grammatical Concord Notional Concord Principle of Proximity 语法一致原则意义一致原则就近原则 Nominal clause Non-finite clause Relative clause Cleft sentence Existential clause 名词性分句非限定分句关系分句分裂句存在句Lecture 3 Noun and Noun Phrase（L4-5） 1. Classification of nouns

光学教程答案(第一章)

1. 波长为nm 500的绿光投射在间距d 为cm 02 2.0的双缝上，在距离cm 180处 的光屏上形成干涉条纹，求两个亮条纹之间的距离.若改用波长为nm 700的红光投射到此双缝上,两个亮条纹之间的距离又为多少?算出这两种光第2级亮纹位置的距离. 解：由条纹间距公式 λ d r y y y j j 0 1= -=?+ 得 cm 328.0818.0146.1cm 146.1573.02cm 818.0409.02cm 573.010700022.0180cm 409.010500022.018021222202221022172027101=-=-=?=?===?===??==?=??== ?--y y y d r j y d r j y d r y d r y j λλλλ 2．在杨氏实验装置中,光源波长为nm 640,两狭缝间距为mm 4.0,光屏离狭缝的距离为 cm 50.试求：(1)光屏上第1亮条纹和中央亮条纹之间的距离；（2）若p 点离中央亮条纹为mm 1.0，问两束光在p 点的相位差是多少？（3）求p 点的光强度和中央点的强度之比. 解：（1）由公式 λd r y 0 = ? 得 λd r y 0= ? =cm 100.8104.64.05025--?=?? （2）由课本第20页图1-2的几何关系可知 52100.01 sin tan 0.040.810cm 50 y r r d d d r θθ--≈≈===?

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P 点光强为：2 21cos 4I A π?? =+ ?? ? 012 (1)0.8542I I =+= 3、把折射率为1.5的玻璃片插入氏实验的一束光路中，光屏上原来第5级亮条纹所在的位置变为中央亮条纹，试求插入的玻璃片的厚度。已知光波长为7610m -? 解： 1.5n =，设玻璃片的厚度为d 由玻璃片引起的附加光程差为：()1n d δ'=- ()15n d λ-= ()76455 61061061010.5 d m cm n λ---==??=?=?- 4、波长为500nm 的单色平行光射在间距为0.2mm 的双缝上。通过其中一个缝的能量为另一个的2倍，在离狭缝50cm 的光屏上形成干涉图样，求干涉条纹间距和条纹的可见度。 解： 7050500100.1250.02 r y cm d λ-?= =??= 由干涉条纹可见度定义： 12min 2min 1221Max Max A A I I V I I A A ?? ? -??= =+??+ ??? 由题意，设22 122A A = ，即 1 2 A A = 0.943 V == 5、波长为700nm 的光源与菲涅耳双镜的相交棱之间距离为20cm ，棱到光屏间的距

《光学教程》(姚启钧)课后习题解答

《光学教程》（姚启钧）习题解答 第一章 光的干涉 1、波长为500nm 的绿光投射在间距d 为0.022cm 的双缝上，在距离180cm 处的光屏上形成干涉条纹，求两个亮条纹之间的距离。若改用波长为700nm 的红光投射到此双缝上，两个亮纹之间的距离为多少？算出这两种光第2级亮纹位置的距离。 解：1500nm λ= 7011180500100.4090.022 r y cm d λ-?= =??= 改用2700nm λ= 7022180700100.5730.022 r y cm d λ-?= =??= 两种光第二级亮纹位置的距离为： 21220.328y y y cm ?=?-?= 2、在杨氏实验装置中，光源波长为640nm ，两狭缝间距为0.4mm ，光屏离狭缝的距离为50cm ，试求：⑴光屏上第1亮条纹和中央亮纹之间的距离；⑵若P 点离中央亮纹为0.1mm 问两束光在P 点的相位差是多少？⑶求P 点的光强度和中央点的强度之比。 解：⑴ 7050640100.080.04 r y cm d λ-?= =??= ⑵由光程差公式 210 sin y r r d d r δθ=-==

0224 y d r π π π?δλ λ ?= = ?= ⑶中央点强度：2 04I A = P 点光强为：2 21cos 4I A π?? =+ ?? ? 012 (1)0.8542I I =+= 3、把折射率为1.5的玻璃片插入杨氏实验的一束光路中，光屏上原来第5级亮条纹所在的位置变为中央亮条纹，试求插入的玻璃片的厚度。已知光波长为7610m -? 解： 1.5n =，设玻璃片的厚度为d 由玻璃片引起的附加光程差为：()1n d δ'=- ()15n d λ-= ()76455 61061061010.5 d m cm n λ---==??=?=?- 4、波长为500nm 的单色平行光射在间距为0.2mm 的双缝上。通过其中一个缝的能量为另一个的2倍，在离狭缝50cm 的光屏上形成干涉图样，求干涉条纹间距和条纹的可见度。 解： 7050500100.1250.02 r y cm d λ-?= =??= 由干涉条纹可见度定义： 12min 2min 1221Max Max A A I I V I I A A ?? ? -??= =+??+ ??? 由题意，设22 122A A = ，即 1 2 A A =

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