(a) Numbers and algebra

The application of 1 and percentage

The application of percentage is arranged on the basis of understanding percentage in grade six (volume one), which is one of the key contents of this textbook. It is necessary to solve some problems that one number is a few percent more (or less) than another number, solve the simple problems of tax payment, interest and discount, and solve the problem of how to find this number when a number is known. Through the teaching of these contents, students can further understand the meaning of percentage and learn to apply percentage in daily life.

2, the proportion of relevant knowledge

The knowledge of proportion has the meaning of proportion, the basic nature of proportion and the solution of proportion. This knowledge is helpful to understand the enlargement and reduction of graphics, and can be used to solve the scale problem.

3. It is directly proportional and inversely proportional.

The teaching of positive proportion and inverse proportion focuses on understanding the significance of positive proportion and inverse proportion, so that students can make corresponding judgments in real situations. According to the spirit of "Standard", the teaching materials should appropriately strengthen the teaching of positive proportion images, and no longer arrange to answer positive proportion or inverse proportion application questions.

(b) space and graphics

1, cylinder and cone

Cylinders and cones are another key content of this textbook, including the shape characteristics, surface area and calculation method of cylinders, and the volume and calculation method of cylinders and cones.

2. Magnification or reduction of graphics

The enlargement and reduction of graphics is a new teaching content in primary school mathematics, so that students can understand that graphics can be changed in size according to a certain proportion. This content is arranged in the third unit, combined with proportional knowledge for teaching.

3. Determine the location, etc.

Determining the position is also a new teaching content. On the basis of a preliminary understanding of the direction, the specific direction of the object is quantitatively described in the form of "a few degrees east of the north" and "a few degrees west of the south", and the position of the object is described in the form of "how far" combined with the knowledge of scale.

Knowledge point combing

(a) Numbers and algebra

The application of 1 and percentage

(1) What percentage is one number more (less) than the other?

① Key points: What percentage is one number more (less) than another number = the amount of one number more (less) than another number ÷ another number.

② For example: Grade 6 boys 180, girls 160. What percentage of boys are more than girls? How many percent are girls less than boys?

There are more boys than girls/number of girls = percentage (180-160)/160 =12.5%.

The number of girls is less than the number of boys ÷ The number of boys = what percentage (180-160) ÷180 ≈1%.

(2) pay taxes.

① Key points: The tax payable is called the tax payable, and the proportion of the tax payable to various incomes is called the tax rate.

Taxable amount = income × tax rate

② Example: After the publication of Zhang Qiang's book, he received the payment 1400 yuan. Personal income tax shall be paid at the rate of 1.4% after deducting 800 yuan from the contribution fee. How much personal income tax should Zhang Qiang pay?

(1400-800)× 14% = 84 yuan.

(3) interest.

① Key points: The money deposited in the bank is called principal, the money paid by the bank outside the principal is called interest, and the percentage of interest in the principal is called interest rate. Pre-tax interest = principal × interest rate× time

Example: My uncle deposited 654.38 million yuan in the bank this year, with an annual interest rate of 4.50%. It will be deposited for two years and will expire after two years. After deducting 5% interest tax, can I buy a computer with 6000 yuan interest?

100000× 4.5 %× 2× (1-5%) = 8550 (yuan)

The interest earned from 8550 yuan > 6000 yuan can buy a 6000 yuan computer.

(4) About discounts.

Key points: A discount is a few tenths, that is, dozens of percent. Current commodity price = original commodity price × discount.

Example: The original price of a certain kind of clothes is 10% off each piece in 50 yuan. What's the price of each piece?

A 10% discount is a 10% discount, 50×90%=50×0.9=45 (yuan).

Example: A certain kind of clothes is now at a 10% discount, and the price is now in 45 yuan. What is the original price of each piece?

10% discount is 90%, x 90% = 45 x 50.

(5) Using series equation to solve the slightly complicated practical problem of percentage.

① Key points: The slightly complicated percentage application problem and the slightly complicated fractional application problem have exactly the same ideas and methods; To solve the practical problem of "knowing how many percent one number is more (less) than another number, find this number" can be solved according to the equation between quantity and quantity; Or answer directly according to the meaning of division.

There are 360 pear trees and apple trees in the orchard, of which apple trees account for 20% of the pear trees. How many apples and pears are there?

Solution: Suppose there are X pear trees and 20%x apple trees.

x + 20%x = 360 x = 300

20%x = 300 × 20% = 60

There are 300 pear trees and 60 apple trees.

A factory used 60 tons of coal in June, 25% less than in May. How many tons of coal were used in May?

Solution: We assume that X tons of coal will be used in May.

x - 25%x = 60 x = 80

A: 80 tons of coal were used in May.

2, the proportion of relevant knowledge

Significance of (1) ratio

① Key point: Two expressions with equal ratios are called proportions.

(2) For example, can 6.4: 4 and 9.6: 6 constitute a proportion?

Because: 6.4: 4 = 6.4 ÷ 4 =1.6 9.6: 6 = 9.6 ÷ 6 =1.6.

So: 6.4: 4 = 9.6: 6.

(2) the basic nature of proportion

① Point: The four numbers that make up the proportion are called the items of the proportion. The two items at both ends are called external proportional items, and the two items in the middle are called internal proportional items; In proportion, the product of two external terms is equal to the product of two internal terms. This is the basic nature of the so-called proportion.

2 for example: 3? :8? =? 18? :48 3 × 48 = 8 × 18

Nakatomi

extreme term

Example: Can 3.6: 1.8 and 0.5: 0.25 constitute a proportion according to the basic nature of the proportion?

Because 3.6 × 0.25 = 0.9 1.8 × 0.5 = 0.9.

So 3.6: 1.8 = 0.5: 0.25.

Example: Four numbers are randomly selected from the factor of 12, and then eight proportional formulas are formed.

Because:12 =/kloc-0 /×12 = 2× 6 = 3× 4.

Therefore, eight different proportions can be formed by randomly selecting two groups of four numbers from the factor of 12 and applying the basic properties of proportions. 2 × 6 = 3 × 4

(2)︰(3)= (4)︰(6) (3)︰(2)= (6)︰(4)

(2)︰(3)= (4)︰(6) (3)︰(2)= (6)︰(4)

(6)︰(4)= (3)︰(2) (4)︰(6)= (2)︰(3)

(6)︰(4)= (3)︰(2) (4)︰(6)= (2)︰(3)

(3) solution ratio

① Key points: According to the basic nature of the proportion, if any three items in the proportion are known, another unknown item in the proportion can be found. The unknown term of finding proportion is called solution ratio.

② For example: 3: 8 = X: 40 =

8ⅹ = 3 × 40 4.5ⅹ = 9 × 0.8

8ⅹ = 120 4.5ⅹ = 7.2

ⅹ = 15 ⅹ = 1.6

(4) scale

Key point: The ratio of the distance on the map to the actual distance is called the scale of this map.

Scale =, there are two forms of scale: numerical scale and line scale.

(2) For example, on the crop layout map of a township, 20cm indicates the actual distance 16km. Find the scale of this picture.

16 km =1600,000 cm

=

Example: Say what the following scale means.

This is the line scale, which means that the distance of 1 cm on the map represents the actual distance of 200 kilometers.

For example, on a map with the scale of 1: 500000, the distance between A and B is12.5cm. What is the actual distance between A and B?

Methods 1, 12.5×500000 = 6250000 (cm) = 62.5 (km).

Method 2, 2.5× 5 = 62.5km.

Method 3:12.5 ÷ =12.5× 500000 = 6250000 (cm) = 62.5km.

Solution: Suppose that the actual distance between the cities A and B is ⅹ cm.

=

1ⅹ = 12.5 × 500000

ⅹ = 6250000

6250000 (cm) = 62.5 km.

(5) area change

① Key points: After a plane figure is enlarged or reduced to a fraction of its original size by a certain multiple (n), what is the area ratio of the enlarged (or reduced) figure to that before enlargement (or reduction)? : 1 (or 1:n? )。

② Example: The big rectangle below is a graph obtained by enlarging a small rectangle. Measure their length and width respectively, and calculate the ratio of the area of large rectangle to that of small rectangle.

The length of the small rectangle is 2.5 cm and the width is 1 cm. The big rectangle is 7.5 cm long and 3 cm wide. The length ratio of large rectangle to small rectangle is 7.5: 2.5 = 3: 1, and the width ratio is 3: 1.

= = × = 9 : 1 = 3? : 1

The ratio of large rectangle to small rectangle is 9: 1.

3. It is directly proportional and inversely proportional.

The significance and image of (1) positive proportion

① Key points: Two related quantities, one changes and the other changes accordingly. If the ratio (that is, quotient) of the corresponding two numbers in these two quantities is certain, these two quantities are called proportional quantities, and the relationship between them is called proportional relationship.

If two related quantities are represented by the letters X and Y, and their ratio is represented by K, the proportional relationship can be expressed by the following formula: = K (certain) A proportional image can be obtained by "drawing", and the proportional image is a straight line. Compared with an image, the corresponding value of one quantity can be estimated according to the value of another quantity.

Example: Look at the table carefully and think about the relationship between the two quantities in the table. What does it matter? Why?

Form 1

Quantity/book 1 368 1 20 ...

Total price/RMB 4 12 24 32 40 80 ...

= 4, = 4, = 4 ……

Because = unit price (certain), when the unit price is certain, the total price is proportional to the quantity.

For example, among the three quantities of a cylinder: side area, bottom circumference and height.

When () is constant, () is directly proportional to ();

When () is constant, () is directly proportional to ().

For example, a paper mill produces 1.5 tons of paper per hour, and how many tons of paper are produced in 2 hours and 3 hours?

Papermaking time/hour 1 234 ...

Paper tonnage/ton 1.5 ...

According to the data in the table, draw the points corresponding to the papermaking time and tonnage in the figure below, and then connect them. Tonnage/ton

six

five

four

three

2

1

1 2 3 4 5 6 7 time/hour

Is the tonnage of papermaking directly proportional to the time of papermaking? Why?

Because = tons of papermaking per hour (certain), when the tons of papermaking per hour are fixed, the tons of papermaking are directly proportional to the papermaking time.

According to the picture, how many tons of paper can be made in five hours?

According to the picture, 7.5 tons of paper were made in 5 hours.

(2) the meaning of inverse proportion

① Key points: Two related quantities, one changes and the other changes accordingly. If the product of the corresponding two numbers in these two quantities is certain, then these two quantities are called inverse proportional quantities, and their relationship is called inverse proportional relationship.

If the letters X and Y are used to represent two related quantities and K is used to represent their products, the inverse relationship can be expressed by the following formula: xy = K (certain).

Example: Look at the table carefully and think about the relationship between the two quantities in the table. What does it matter? Why? Buy a notebook with 60 yuan money. The unit price of the notebook and the quantity that can be purchased are as follows:

Unit price/yuan 1.5 2 3 4 5 6 ...

Quantity/cost 40 30 20151210 ...

1.5 × 40 = 60 ,2 × 30 = 60 ,4 × 15 = 60 ……

Because unit price × quantity = total price (certain), when the total price is certain, the unit price and quantity are inversely proportional.

General review materials of primary school Chinese: error-prone review

Auxiliary exercise

1, confusing words:

Meaning-Righteousness-Wrong-Enlightenment-Meng

Courage-Courage-Colorful Scenery-Environmental Guidance-Tao

Haohao Award-Postscript of Paddle Full-Pull

Rent-Import-Architectural Style-Trembling-Secret

Thirst-drinking core-flushing core-asthma-migration

Birthday-Hyun-hyun-Xun Yu-Yi Zhe-Withdraw

2. One more pen, one less pen, one more pen, one more pen.

Add comments:

Malicious-Wolf Folding-Playing Lottery-Paddle Mud-Secret

Competition-Sentence-Ten Days Constant-Enjoy Electronic Defense

Apricot-Yaodai-Cutting Stone-Waiting for Incense-Education

Change a pen:

Guide-Different Days-Parents-Foot Blindness-Education

Start writing: Zhuang-finish pressing-not too-dog gambling-draw lots.

3. Choose words to fill in the blanks:

() Vacation Department () () Name () Days (Summer, Department)

() Determining () Difficulties () Fixing () Risks (Determining and Difficult)

Waves () make () disappear () halfway ()? (waste, expense)

() chaos () water () war () but I don't know (mixed, muddy)

() heart () broken wall () (definitely, absolutely)

4. First, judge whether each component below is wrong, then circle the wrong words and put them in brackets.

Much ado about nothing, Zhang Guan Dai Li is waiting for him ()

It's a close call to reverse right and wrong over time ()

Stand up, stand up and stand on your own feet.

Hesitant, resplendent, full of food and sleep ()

I stayed up all night to buy bamboo slips and pearls, and I was listless ()

I can't help it It's perfect. Countless people are in high spirits ()

Gong Yu mountain high-spirited, blustery, self do, self have ()

If you are upset, you can't do anything. Better army and simpler management ()

Vivid, refreshing, full of sound and emotion ()

Find the words that are easy to make mistakes, look them up in the dictionary, and make up some exercises to test your classmates. General review materials of primary school Chinese: word review

Write a group of words with radicals.

Example: Wolf (wolf dog), fox (fox), solitary worm () ()

Dian () () () Gong () () ()

Yao () () () has () ()

Add radicals to write words.

Ghost (Soul) Dream Soul (Spirit) Charm (Shame) Shame Tree

Meng () () () Xiu () ()

Drought () () (Good () () ()

Fu () () ()

Auxiliary exercise

1, confusing words:

Meaning-Righteousness-Wrong-Enlightenment-Meng

Courage-Courage-Colorful Scenery-Environmental Guidance-Tao

Haohao Award-Postscript of Paddle Full-Pull

Rent-Import-Architectural Style-Trembling-Secret

Thirst-drinking core-flushing core-asthma-migration

Birthday-Hyun-hyun-Xun Yu-Yi Zhe-Withdraw

2. One more pen, one less pen, one more pen, one more pen.

Add comments:

Malicious-Wolf Folding-Dismantling Awards-Paddle Qin-Tibetan Competition-Sentence-Ten Days Constant-Enjoy Five Preventions

Apricot-Yaodai-Cutting Stone-Waiting for Incense-Education

Change a pen:

Guide-Different Days-Parents-Foot Blindness-Education

Move an amount:

Zhuang-pressing the bottom-not too-dog gambling-smoking

3. Choose words to fill in the blanks:

() Vacation Department () () Name () Days (Summer, Department)

() Determining () Difficulties () Fixing () Risks (Determining and Difficult)

Waves () make () disappear () halfway () (waste, cost)

() chaos () water () war () but I don't know (mixed, muddy)

() heart () broken wall () (definitely, absolutely)

4. First, judge whether each component below is wrong, then circle the wrong words and put them in brackets.

Much ado about nothing, Zhang Guan Dai Li is waiting for him ()

It's a close call to reverse right and wrong over time ()

Stand up, stand up and stand on your own feet.

Hesitant, resplendent, full of food and sleep ()

I stayed up all night to buy bamboo slips and pearls, and I was listless ()

I can't help it It's perfect. Countless people are in high spirits ()

Gong Yu mountain high-spirited, blustery, he deserves ().

If you are upset, you can't do anything. Better army and simpler management ()

Vivid, refreshing, full of sound and emotion ()

5. Find your own words that are easy to make mistakes, look them up in the dictionary, and then make up some exercises to test your classmates.

General review materials of primary school Chinese: word review II

First, similar word groups.

Teng suppress mania, hit, slap, rub, hide, lift, dry, and cry Buddha.

Sorry, I lost my job, flooded rattan willows and washed boiled water.

Warm cooked beaks are grilled in flood season, and the waves are cooked to control the edge.

Basket Xun Peirui Xi Wolf who drives to turn the track Xun Bei Chongkeng.

I plan to spin satin in the shed, bold and cautious, like jumping forging.

Kang of the Terracotta Warriors swooped down to visit Duan Jun's finger and licked the ring.

As soon as possible, the silk building will be woven and pasted, and the volume of "Wojuan Tongzhi Exhibition" will be added.

Second, the sound is close to the word group.

It is necessary to distinguish one's figure from the mark, and to distinguish one's figure from the performance.

Third, multi-tone word groups.

Scattered s m: n sà n kinds of zhǒng zh?ng coal seams.

Thin báo bó Chao zhāo cháo should be yingying.

Buddha fó fú earned zhēng zhèng put B m:

When playing tán dàn and táo bà Dior.

Zhang Zhang Jiaojiao JIā o is Zhang Zhang.

Ban Kinkin? The rate of Shu ai Lu kong kòng kòng

This is a good example.

pass zhàn chuan Sha Shāas wèI wéI I

Guan guàn guān sends fā fà times Shen Cheng.

Hold on, hold on.

See cā n shē n zai z m: i zà i.

Fourth, correct typos.

Hot temper () indomitable () radiant ()

The wall is dark () the demon is like fire () the grass is like bacteria ()

I hope there is no silver () lightning () high-rise order ()

All ears () burning eyebrows () is very common.

Hunger matching breaks () concentration () conspiracy ()

There is no way out () keep trying () concentrate ()

Carelessness () concentration () happiness disappears ()

Back to Zhao (China) and Magic Sky Building (China).

General review materials of primary school Chinese: polysemous word review

Polysemy is a major feature of Chinese. In primary school, as long as students understand this feature and the basic meaning of words, they can understand the extended meaning and figurative meaning of words in contact with the language environment.

Auxiliary exercise

(1) Find out the synonyms of the words with dots below and tell me what their meanings are different.

(1) In the evening, Grandpa also took the model and meditated under the lamp. ( )

(2) The workers are pondering over pieces of marble in the dark stone house. ( )

Since Xiaoling broke her leg, her classmates have taken care of her very enthusiastically. ( )

Teacher Wang reminds everyone that writing a composition should not only describe things clearly, but also pay attention to the care before and after. ( )

(5) before dawn, large forces launched the last general attack. ( )

Dad started the car and rushed forward with full horsepower. ( )

(2) Find two antonyms of the listed words:

Calm () () Complex () ()

Thin () () wide () ()

Simple () () plane () ()

(3) Write synonyms and antonyms of the following words.

Synonym Thinking () Guess ()

Praise () complain ()

The antonym of success () is complex ()

Abstract () indifference ()

Review should pay attention to the following points.

(1) According to the requirements of the curriculum standard, "I know about 3,500 commonly used Chinese characters, and I can write Chinese characters correctly and neatly, with a certain speed." This is one of the most basic Chinese qualities of students. So be sure to pay attention to the review of words and phrases.

⑵ The ability to look up a dictionary is an important ability to help students learn words, a skill that must be mastered, and a skill that students often use in their future study and work. Therefore, we should not only learn the phonetic sequence method and radical method, but also learn the stroke method. Review should be combined with students' situation, often used, and gradually develop habits, but there is no need to practice too much.

⑶ The key and difficult point of dictionary search is to determine radicals and choose definitions. This should be guided by the words in the text, solve students' difficult problems and do necessary exercises.

(4) The focus of word review is understanding and application. Common words and keywords in the text should be used by students in various forms. Writing synonyms and antonyms, choosing words to fill in the blanks are common forms, as well as making sentences, writing conjunctions and collocations, all of which students should practice.

General review materials of primary school Chinese: a guide to idiom review

In order to highlight the importance of idioms, idioms are regarded as a separate part. Idioms are the essence of Chinese, and they are concise and incisive fixed phrases or short sentences that people have used for a long time. Idioms in Chinese are often composed of four words, which generally have their origins. Many idioms have a vivid, interesting and philosophical story, such as a glass bow and a snake shadow, which are seamless and blockbuster. Therefore, learning idioms can not only accumulate vocabulary, but also enhance reading comprehension, understand history and broaden knowledge. In addition, if it can be used properly, it will make the language more concise and vivid and improve our writing level.

Auxiliary exercise

First of all, interesting numerical idioms.

1, one+1:151every move, every move, every move echoes each other, every minute, every heart, every inch of time and every inch of gold. ...

2. One+two: clear and white, clear and white, poor and white, repeat mistakes, clear and white, kill two birds with one stone. ...

3, one+three: twists and turns, a corner, three reflections, three sighs, one year old, three moves, and then three days, such as Sanqiu, one country, three fairs. ...

Second, guess the idiom:

Paper tiger-empty heart-unfathomable puppet show-putting on airs and keeping long hair-desperate-every little makes a mickle, no empty hair-no applause in every shot-wonderful, it snowed-said and done-the invoice was not stamped-it was not enough to turn on the tap. The longest day out of nothing-the photos developed by years-shows its true colors in the mirror-is exactly the same as how the water of the Yellow River moved out of heaven-the canoe with a long history has passed through Chung Shan Man-and it was smooth sailing.

Third, idioms solitaire:

Wonderful-breaking promises (insincere words, inconsistent words and deeds, careless friends, exaggerated words and manners)-nonsense (swearing, grabbing things, traveling to the border) ...

Four. Idiom story contest (can be classified, such as historical figures, fables, etc. )

Hesitant, resplendent and magnificent, sleeping in the wind () buying bamboo slips and returning pearls all night, safe and sound, listless () I can't help it, and I have no time to be cheerful () Gong Yu moved mountains, full of enthusiasm, blustery, self-tormented () uneasy, omnipotent, depressed, streamlined () colorful, refreshed and equal in voice and smile ().

General review materials of primary school Chinese: idioms

first part

A place to live and work in peace.

history as the second of the four divisions of ancient Chinese library collection

A drop in the ocean, unpredictable and endless. Very unique and polite. Hold your breath and stare at the candle. The night tour is magnificent, choppy and stormy, and I can't help it.

philosophical works

Brilliant, verdant grass, long warblers flying over Qian Shan, speaking freely, the morning light is hazy, and there are thousands of people in their hearts

The mountains and rivers are surprisingly successful, and the rookie is dejected and despondent. Spring is beautiful and full of spring, and the lips are dead and the teeth are cold.

D department

Surprised, puzzled, famous, ostentatious, proud, brilliant, equally transferred.

Abandon one's helmet and armor, stand tall, with unique effect, intermittent.

F department

Prosperity is a crazy dream. Birds and animals are dusty and sunny, sunny.

G department

You can't stand the cold at the top, you can make great achievements, and you can attack without exception.

The drums are loud, impressive, dazzling and aboveboard.

H department

Very bright, very powerful, very fake, it is tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger, tiger

This is a new look. This is a waste of time.

J department

Hungry, quick-witted, persistent, well-known, one after another, glittering, resplendent and fascinating.

Exhausted, stormy, thrilling, streamlined, smart and capable, world-famous, absorbed and rescued.

K department

It's good to speak freely and open the book without delay.

L department

Gobble, strive for perfection, endless stream, full of self-confidence, turn the tide, go forward bravely and have a bright future.

Longteng Hu Yue Zhulong Hubu Yue Long Feng Ming Zhang Long Fengzi Longru

M department

Unintentional, unintentional, self-recommendation, smile, fine features, good face, plain face, bright moon and cool breeze.

Unexplained, unknown, staring, dumbfounded

N bu

Birds sing and flowers smell angry.

P department

Demons throw bricks to attract jade, and Pengcheng Wan Li dances with thorns, and can't wait to be confused and celebrate.

Q department

Strange flowers and herbs, rare treasures, suffocating weather, ever-changing weather, thousands of ways to escape from each other.

Qian Shan ten thousand waters really pour down. Concentrate.

R & d department

There are many talented people, and many people are hungry.

S department

A blessing in disguise is a blessing in disguise. For three years and five years, the scenery is beautiful, the scenery is beautiful, and the self-sacrifice is wonderful and energetic.

Lively, energetic, domineering, poetic, picturesque, idyllic, dancing, waiting for the rabbit, the book sounds loud.

In hot water, the water and the sky are connected, and the death is so tight and timid.

Testing department

Set a mantis to catch cicadas and help each other in the same boat.

W department

Return to Zhao in one piece, the Great Wall of Wan Li and Qianshan, change your arrogance and be vivid and gentle.

Smelling the chicken dancing, paying for it, is priceless, unrestrained, helpless, endless, and unintentional.

Without a trace, carefree, for no reason.

X department

Sitting on the floor, beaming, carefully trying to smile, be elated and relaxed.

Ecstatic, cheerful, with answers, questions, questions, questions, questions, questions, questions, questions, questions, questions, questions, questions, questions, questions, questions.

Y department

I can't live up to it, I am teetering, I am a blockbuster, I am the same, I am dark, I am not good at it.

Dressed well, resolutely reluctant, vaguely like mushrooms after rain, serious twists and turns.

(of scenery) radiant.

One man keeps the pass, but ten thousand people can't cross it-(referring to the pass) it is a strategic place and difficult to enter.

Z department

Make persistent efforts, singing and dancing, invincible, an armchair strategist.

Stars scratch their heads, concentrate their strength, brag, contradict themselves, and contradict themselves.

General review materials of primary school Chinese: review of related words

A sentence with related words generally consists of more than two clauses. There are various relationships between clauses to meet the needs of our expression. Therefore, it is very necessary to learn to choose related words correctly.