20 13 homework answers on the first 48 pages of summer vacation in Hunan junior high school.

Page 1,/kloc-0 1.A2.C3.Ab4.C5.B6.A7 Controlling the use of resources.

8.( 1). Humans chop down trees without planting them at the same time (2). Control population growth and implement family planning. Control their greed.

Page two.

/kloc-0 1.d2.b3.d4 Regret punishing "I" and fear that "I" will leave sequela. I didn't write it because there were no underlined words. 6.

Page three,

1. 1/4 2.3（X+a）3。 2 4.8 5.C 6。 A seven. d 8.2（X-4）/X- 1

9. The original formula = x2-x2-xy+xy+y 2 = y 2.

Page four,

1.B 2。 B 3。 A 4。 C 5。 C 6。 C 7。 An eight. C 9。 B 10。 Headache and sore throat

Stomach ache. (1) Question (2) Small (3) Books (4) Music (5)? (6) food (7)?

(8) Brief introduction of composition of bedroom (9) feet

Page five,

1. Power 2. 0. 18 0.3 300 3. An error occurred when using the rangefinder 3 4. D5。 D6。 C7。 D8。 d9。 c 10。 1 omitted.

Page 6 1. C

2.B 3。 D 4。 C 5。 C 6。 Zhang Xueliang's northeast flag change 7. Zhu De, Chen Yi, Zhu De and Mao Zedong. 193419351936 Huining 9. Bo Gu et al.

In the Northern Expedition, the Ye Ting Independent Regiment (II) took Mao Zedong as the correct leader, but failed because it was divorced from the broad masses of the people.

Fourthly, Zunyi Conference established the correct leadership of the CPC Central Committee represented by Mao Zedong and saved the Party and the Red Army.

Page 7 1. A

2.B 3。 C

Page 8 1. A

2.D 3。 D 4。 A 5。 D 6。 D 2( 1) Two interests are interdependent and inseparable. (2) Public interests.

Page 9, 1( 1) Learn from the past.

(2) Every room in the palace has been grounded. (3) Pines and cypresses are natural. (4) I am alone, and my tears are falling. (5) Tomorrow I will loosen my hair and go fishing by boat. (6) Romance of the Three Kingdoms. (2) Visit the thatched cottage. (3). A 4) Examples and figures.

Let readers know how Lop Nur disappeared. 5. The water source of Tarim River directly affects the relationship between Lop Nur. 6. Make readers aware of the dangerous situation when Lop Nur disappears. 7. Surprise, surprise and panic.

8. How did Lop Nur disappear

Page 10, omitted

Page 1 1 1. No.

She 2. Not 3. Not them 4. Not her 5. Not her 6. Not them 7. Not him.

We are not 10. I am not 1 1. E 12。 A 13。 D 14。 C 15。 B 16。 C 17。 A 18。 B 19。 B

20.C 2 1。 C 22。 A handful of 23. C 24。 A handful of 25. B

Page 12 1.

3 8 2. 10 is smaller than 3.10/0 4.c5.b6.c7. Solution: Because U=RI, U=6.5 ohm *0.4 ampere =2.6 volt.

8. solution: because R=U/I, R=7.2 volts /0.4 ampere = 18 ohm 9.

Page 13 1. B

2.D 3。 D 4。 C 5。 B 6。 Northeast Yao Ziqing. Myanmar. Yuxianggui 9. Chongqing negotiation 10. In order to unite all the Japanese people to resist China together, the * * * production party took measures to negotiate with the Kuomintang in Chongqing.

1 1.① the correct leadership of the leaders, ② the reunification of the country.

Page 14 1. A

2.B

Page 15 1. C

2.C 3。 D 4。 C 5。 C 6。 B 7。 (1) Dynamo Club of Mongolia (2). Love China and the most dazzling national style (3). National equality, national unity and national prosperity.

④ Omission

Page 16 1. Every night, the candle will cry dry the wick.

In the morning, she saw her hair changing in the mirror. Here, the mountain light shines on birds, and my road twists and turns through a hidden valley. Ouyang Xiu Song 4. Resurrection of world writers, war and peace. The Love Trilogy of Li Yaotang's Riptide Trilogy.

6. Prose Gorchio's childhood, on earth and my university 7. Write "I" and see a father cleaning his bike for his daughter. He is glad that all the students are not in the dormitory.

9. Writing a detailed story about my father cleaning his daughter's bike shows my father's carefulness and greatness.

Page 17 1. B

2.3. C4. Equal to 5.24 6.4 7.45 8.5 cm 24 cm.

9. Solution: parallelogram ABCD, ∴BO=DO,AO=CO, city center, ∴EO=GO,FO=HO,∴ parallelogram ∴EFGH (diagonal bisection) and ∵EG⊥FH.

10.( 1) solution: ad = BC ∴∠ DCA = ∠ CEB ∠ be = CD ∴∠ DAC = ∠ BCE ∠ CD = be.

(2) When the diagonals are equal and equal to CE.

Page 18 1. B

2.A 3。 A 4。 C 5。 C 6。 B 7。 C 8。 B 9。 F 10。 T 1 1。 T 12。 F 13。 T 15。 Ekbad

Page 19 1.3

Two 0~3 0~ 15 0~5V 2. Voltmeter and ammeter 3. Voltmeter = = voltage 4.0~50 1 5. D 6。 D 7。 An eight. B 9。 C

10. Solution: ∵U=RI, ∴ u =10Ω * 5a = 50V11.1has the largest resistance, and 3 has the smallest resistance, because when the voltage is constant, the larger the current is.

Page 20 1. C

2.C 3。 C 4 explosive D 5。 D 6. 10 1 7 Peng 1953 Korean armistice agreement 8. Anti-corruption, anti-waste, anti-bureaucracy, anti-bribery, anti-tax evasion and anti-cutting corners. 19996。 999999999996

Mao Zedong III (1) War to Resist US Aggression and Aid Korea (II). Expressed Mao Zedong's self-confidence and heroic feelings. Fourth, ellipsis (because it is too long).

Page 2 1 page 1. A

2.B 3。 C 4 explosive D 5。 A six. B

Page 22 1. D

2.D 3。 A 4。 D 5。 A six. D2（ 1）。 Loving labor can make people's lives happy and rich, and can also increase their talents, exercise and improve their social adaptability and communication skills.

In order to enrich our life, we should work more and exercise ourselves more.

Page 23 1. D

2 1( 1). The draft of this poem ②. There is only one Yangtze River between Jingkou and Guazhou. 3.D 4。 More vivid and concrete. 5. Writing poetry and singing and dancing in Yunnan.

6. No, because if you remove it, it will appear that love songs are monotonous. 7. It refers to the singing transition of love songs.

Page 24 1. isosceles trapezoid

2.(2) Two groups of parallelograms have equal opposite sides (3). Moment is a parallelogram with two right angles.

Two 1. Solution: ∵EF=EG,∴∠B=∠C (equilateral and equiangular) and ∵ trapezoid ABCD, ∴ isosceles trapezoid ABCD (two lower base angles are equal) 2. Student a's conformity, reason: two on base.

. Coincidence of student D: ① Two waists are equal; ② The two upper and lower angles are equal; ③ The two bottom angles are equal; 3.

Page 25 1. Implementation

2. Educated 3. Replicable 4. So 5. Learn a lot 6. Which 7. Wear black.

Clothes 8. C 9。 C 10。 A 1 1。 B 12。 B

Page 26 1. A

2.B 3。 C 4 explosive C 5。 C 6。 B 7。 C 8。 A nine. B 10。 D11.220v * 3A = 660W.

12.w = pt = 4500w * (3 * 360) = 4.86 *10 to the seventh power JW = pt = 4.5kw * 3h =13.5kwh.

t = W/P = 13.5kwh/0.025 kw = 540h

Page 27 1. A

2. A3.B4.A5.D6.D7. Independence 1 1 India and Myanmar stand for equality and peace, regardless of the size of the country. 8. Quantity, scale, quality and benefit.

Manpower-intensive and technology-intensive. Reform and opening up concentrate on socialist modernization. Planned public ownership economy, diversified economic plans and market regulation 3( 1). One country, two systems (2). Tibet Xinjiang

（3）。 1992, Deng Xiaoping (4) purpose: to complete the great cause of the motherland's reunification and realize the ultimate reunification of the motherland.

Significance: The people of China have washed away the national humiliation for a hundred years and enhanced the national self-esteem of the people of China.

Page 28 1. A

2.B

Page 29 1. A

2.C 3。 C 4 explosive A 5。 C 6。 (1). It shows that modern society needs people with high professional skills and high education.

(2) I hope to be a person with good professional skills, strong innovation ability, practical experience, courage to challenge and high academic qualifications. Study hard, work during holidays and exercise yourself at ordinary times.

Page 30 1. A

2.D 3。 You never cheat us and teach us to do the right thing. 4. Zhang 5. (1) grow up (2). Adapt (3). Take off (4). Eat six. (1). Or go to midnight.

(2) I have mastered the general meaning of the Six Classics and feel very ambitious. 7. I am filial and considerate of my mother. 2 study hard.

Page 3 1 1. unstable

2.4 3.1:2 4.105 5.30 6. A 7. D 8。 C

3. Points ∵EG⊥FH and ∴ E.F.G.H are the midpoint of AB, BC, CD and DA respectively, ∴ eg and FH are the center lines of a square, while ∵ square ABCD and ∴EG=FH (the center lines are equal).

Parallelogram ABCD, ∴AD=BC, ∴AF+DF=BE+CE (equivalent substitution), and ∵ BE = 2cm, af = 2.8cm, ∴ BC = BE+AF = 4.8cm. 。

Fifth, let AC and EF intersect at point O, ∫ parallelogram ABCD, ∴∠CAE=∠AC,EF, and ae = cf, ∣ame =∣CMF, ∴△AME are all equal to △CMF(asa), ∴.

Page 32 1.

A 2。 C 3。 C 4 explosive B 5。 C 6。 B 7。 C 8。 B 9。 B 10。 A 1 1。 C 12。 B 13。 C 14。 C 15。 A 16。 B 17。 A 18。 C

19.B 20。 B

Page 33 1. B

2.B 3。 D 4。 C 5。 D 6。 C 7。 D 8。 There will be a phenomenon that two nail tips touch together. The reason is: the magnetic permeability of iron.

9. One day: 27 1.5 million kilowatts * 24 = 65 1.6 million kwh = 65 1.6, one year: 65 1.6 * 365 =237834 million kwh = 237834.

10.p = Wt = 1/200÷ 1/200 = 1KW = 1000 w

Page 34 1. D

2. Jiang Guangnai, Cai Yankai. Umezu Yoshijiro, he Qin Ying 6. Nanjing 30. Taierzhuang 8. Chennault and Bethune.

9. The reason is that the rise of the United States is in war. At first, the Japanese occupied China, then gave up hope and changed to naked plunder.

1 1. After the September 18th Incident, ethnic contradictions between China and Japan rose. At the end of 1935, the * * * Wajiaobao meeting established the policy of establishing the anti-Japanese national United front.

Page 35, I, D.

2. 1.B 2。 Examples. List the figures for comparison. 3.A

Page 36, omit

Page 37,1.bee

2. Done 3. Started 4. Skating 5. Skating 6. Year 7. Questioning 8. Round 9. Collection

Interested. How long has he worked? 12. How long has he joined?

Alliance? 13. My favorite subject is English 14. I haven't finished writing mine.

Testing. 15. Do you want to set up a club? Use 17. Cool and dry 18. Cigarettes.

Correct height 20. Clean

Page 38 1. microphone

The sound of receiver 2 vibrates. Sound symbol combination 3. Electromagnetic current damage 4. Working principle current electromagnetic wave 5. Optical fiber length and great electromagnetic confidentiality 6.A7.D8.D9.A

10 . c 1 1 . a 12 . b 13. 170 MHz = 1.7 * 10 8hz，enter = c/f = 3 * 65438。

Page 39 1. A

2.B 3。 (1). Not for sale (2). Homesickness is empty, and when I return to my hometown, it is like rotten ke (3). No one has died since ancient times, but you can stay with your heart and shine in your history (4). I hope people can live forever, and you are beautiful.

(5). Xing, people suffer. When people die, people suffer. The water is green and blue, a thousand feet deep. The more respected the color, the more rational it is. ① The Analects of Confucius ② The Story of Yueyang Tower ③ The biography of Mr. Wuliu ④ The tune of water.

⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤ ⑤

8.D

Page 40 1.a-b

2.2ab 3 . x+y 4.5x+ 15.86 . C7 . b8 . d9 . c 10。 Solution: The original formula =1.99 (1.99+0.01) = 3.98.

1 1. solution: the original formula = 25 (124-76) = 25 (124-76) = 25 * 78 * 200.

12. Solution: The original formula =-4x (x-2x-1) =-4x (x-1) (x-1)13. Solution: Original formula = 2a(a4-6538).

14. solution: the original formula =(a-b)(a-b) 15. Solution: The original formula = 3-(2a+b)=(3+2a+b)(3-2a-b).

=（2a+B- 3）（2a+b+ 3）

Page 4 1 1. B

2.C 3。 C 4 explosive A 5。 A six. B 7。 C 8。 C 9。 B 10。 C 1 1。 B 12。 A 13。 B 14。 C 15。 C

Page 42 1. B

2.B 3。 D 4。 A 5。 (1). Replace "related" with "some" (2). Replace "preventing children from surfing the Internet" with "preventing children from surfing the Internet". 6. Win a (beautiful) career (edge) Preparation (very detailed) Extreme (exhausted)

7.( 1). This is the magnificent scene of Yueyang Tower (2). Seeing the natural scene will probably cause different feelings, right? 8. Don't be happy about things and don't feel sad for yourself.

Suffer hardship first, enjoy it later; Worry about the world first, and enjoy the world later; be the first to bear hardships and the last to enjoy comforts; be concerned about affairs of the state before others, and enjoy comforts after others; be the first to be concerned with state affairs and the last to enjoy oneself

Page 43 1. B

2.b3.a4.b2， 1 . x =- 1 2.3 * 10-4 3 . a-3 4. 12/x- 1 5。 （a+b）（a-b）

, 1. solution: original formula = 3 (x+1)/(x+1) (x-1)-2 (x+1)/(x+1.

2. Solution: =-3/2-1/3x-1= 2/3x-1,(9x-3/2)- 1 = 2, -9x+3-2=4, x.

3. Solution: 4/x-4 = (1/x+2)-(1/x-2), 4 =/x-4≦-4/x-4. According to the formula, A and B are reciprocal.

4. Solution: Suppose manual translation is X words per minute and computer translation is 75X words per minute.

2 hours and 28 minutes = 148 minutes, 3300/X=3300/75X+ 148, 247500 = 3300+11.

, so 75X= 1650

Page 44 1. A

2.C 3。 B 4。 B 5。 A six. B 7。 B 8。 B 9。 A 10。 Maybe, maybe.

15. Read 16. No 17. Visit 18. Buy 19. Rain 20. Chat composition: Dear.

George: I heard that your parents surf the Internet because of their middle emotions.

School students sleep, so don't let you surf the internet. I think you may have a problem with your parents.

State that you want to join the web production team. If your parents

I agree. Do you mind not playing computer games while playing games?

Web page? Your online friend John

Page 45 1. Features: from "where there is a will, there is a way" to. Meaning: As the slogan of rural middle schools, it aims to encourage children to study hard and get ahead in schools near cities.

2.( 1). The earth is like a big family, and everyone is his own brother and sister. (2). Very simple, very quiet, very gentle 3( 1). Run (2). Wait (3). Hotel (4). Wear.

(5). Two meals (6). Lot (7). Hot water. 4. "Branches" lead to "limbs", limbs. Get dressed. I don't think I eat and dress worse than people, because I have enough happiness in my heart.

6.① There is no condition to take a book to read; ② Teachers who know nothing about the abyss associate with themselves; They have to go far away to study; 7. Purpose: To encourage Ma Sheng to study hard with his own personal experience.

Revelation: In modern times, if we have the conditions to study, we must study hard.

. Physics is the last edition,