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2 tháng 8 2021

circle old the one out

6. did               went              watched              swam

* Gthik :

Vì 3 ĐT còn lại đều là ĐT bất quy tắc , còn " watched " là ĐT có quy tắc 

Có bạn nào biết mấy bài này không ? Giúp mình vs. Mình đang cần gấp lắm.                                       UNIT 10: HEALTH AND HYGIENE               I. Choose one word with underlined part pronounced differently from the others1. A. wanted                   B. needed              C. looked              D. visited2. A. bus                         B. busy                 C. unhappy           D. cut3. A. looked                    B. walked             C. learned             ...
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Có bạn nào biết mấy bài này không ? Giúp mình vs. Mình đang cần gấp lắm.

                                       UNIT 10: HEALTH AND HYGIENE              

I. Choose one word with underlined part pronounced differently from the others
1. A. wanted                   B. needed              C. looked              D. visited
2. A. bus                         B. busy                 C. unhappy           D. cut
3. A. looked                    B. walked             C. learned              D.stopped
4. A. party                      B. apartment         C. far                     D. practice
5. A. stay                        B. late                   C. back                  D. date

6. A. laughed                  B. looked              C. collected           D. missed

7. A. asked                     B. missed              C. called               D. cooked

8. A. changed                 B. measured          C. brushed            D. talked

 

II. Choose the best answer to complete each sentence.

1.We’ll meet……………..the movies theater.           

A. in front of                  B. next to                       C. on                    D. opposite
2.Did you …….. to school yesterday.
A. go                                B. went                            C. going                D. goes.
3. It’s not far…………..here, so I often walk.
A. to                                 B. with                             C. from                 D. over
4.………………….to meet you Hoa.
A. Please                          B. Pleased                       

C. I’m please                  D. None is correct
5.Hoa is sad, because she knows …………………here.
A. someone                      B. anyone                         C. no one                   D. everyone
6.Her new school is……………than her old one.
A. bigger                          B. large                            C. beautiful                D. more
7.My brother is ………………grade 7.
A. at                                 B. in                                 C. on                          D. of
8.Everyday he………….the bus to work.
A. gives                           B. comes                          C. catches                  D. goes
9.Lan is staying…………..her aunt’s house in Hanoi now.
A. in                                 B. on                               C. with                       D. at
10.It often ……………me 15 minutes to go to school by bike.
A. takes                     B. gets                             C. gives                       D. has

11. They suggested that he…………. by bike or public transport.

A. should travel         B. might travel             C. travels                     D. traveledp

12. The light…………… so we couldn’t see any thing in the dark.

A. went                     B. went off                   C. went by                   D. went out

13. You should get a ………..to check if there is any crack in the pipe.

A. electrician             B.plumber                 C. carpenter                 D. goldsmith

14.Is it true……………. the law says there is no smoking in restaurant in this city?

A.that what                B. what                        C. if                             D. that

15. Lan is a…………………typist. She often makes many spelling mistakes.

A. careful                  B. care                      C. careless                   D.carelessly

16. Where …………. you last Sunday ?

     a. is                          b. was                    c. are                               d. were

17. Last week, Mr. Tan…………….to Ho Chi Minh City for a trip.

     a. go                         b. went                   c. going                            d. goes

18. What is your …………, Lan? – I’m 45 kilos.

     a. weight                  b. height                c. age                               d. name

19. ……………is this book? – It’s 4,000 dong.

     a. How much           b. How old            c. How many                   d. How tall

20. Yesterday, I …………….to school because I was sick.

     a. goes                     b. go                      c. went                             d. didn’t go

21. Hoa ………………her teeth three times every day.

     a. brushes                 b. brushing             c. brush                            d. brushed

22. Did you buy any souvenirs in Nha Trang ? + Yes, I ……………

     a. do                         b. am                     c. does                             d. did

23. I live ……………Quang Tri town with my grandmother.

     a. on                         b. at                        c. between                       d. in

24. ……………..did Lan go to the dentist’s last week? – Because she had a bad toothache.

     a. What                    b. Why                  c.When                            d. Where

25. Would you………….…me to the post office, please?

     a. take                      b. took                   c. taking                           d. Take

III. Read the passage and answer the following questions.
        Mr Hai has two job. On Monday, Tuesday and Wednesday he works in a hospital where he  helps to look after children who are ill. He goes to the hospital by bus. He starts job at ten o’clock and works until quarter to five. He stay at home on Thursday and Friday, he writes stories. Last night one of his roommates cooked the meal. After dinner, they looked at the newspapers to see what’s on TV and they talked about the day.

1/ How many jobs does Mr Hai have ?

………………………………………......................................................................

2/ Where does he work ?

………………………………………………...........................................................

3/ What time does he start job ?

………………………………………………...........................................................

4/ Does he write stories ?

………………………………………………...........................................................

5/ What did he and his roomate do last night?

……………………………………………………………………………....................

IV. Write the past form of the verbs.       

1. stop    ……………          2. forget   ……………              

3. wash ……………....        4. send     ……………         

V. Rewrite the sentences using the printed phrases so that they have the same meaning

1. What is Lan’s weight?

=> How …………………………………………….…………….………..?

2. How old are you? 

=> What is …………………………………..…………………………?

3. How tall is he?

=> What………………………………………………………………...……?

4
25 tháng 1 2022

I.

1, C

2, B

3, C

4, D

5, C

6, C

7, C

8, B

 

bn tách ra đi, chứ nhìn qua thấy nản lắm/:

28 tháng 7 2023

Wardrobe?

 Lưu ý :Có thể sẽ sai.

28 tháng 7 2023

backpack

cs ai biết làm bài này k giúp mình vs mình đang cần rất gấp mong các bạn làm giúp mình (xin cảm ơn)I. Choose one sentence that best rewrites the sentence given:1.      They understand more than we do.A.    We don’t understand as much as they do.B.    We  don’t understand anything at all.C.    They understand everything inside out.D.    They are very intelligent.2.      It is much more difficult to speak English than to speak French.      A. To speak French is more difficult than...
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cs ai biết làm bài này k giúp mình vs mình đang cần rất gấp mong các bạn làm giúp mình (xin cảm ơn)

I. Choose one sentence that best rewrites the sentence given:

1.      They understand more than we do.

A.    We don’t understand as much as they do.

B.    We  don’t understand anything at all.

C.    They understand everything inside out.

D.    They are very intelligent.

2.      It is much more difficult to speak English than to speak French.

      A. To speak French is more difficult than to speak English.

      B. To speak English is more difficult than to speak French.

      C. Speaking English is more difficult than to speak French.

      D. Speaking French is not as difficult as to speaking English.

3.      My interview lasted longer than yours.

      A. Your interview wasn’t as short as mine.

      B. Your interview was shorter than mine.

      C. Your interview was as long as mine.

      D. Your interview was longer than mine.

4.      When I was younger, I used to go climbing more than I do now.

      A. Now I don’t go climbing anymore.

      B. I used to go climbing when I younger.

      C. Now I don’t go climbing as much as I did.

      D. I don’t like going climbing any more.

5. Your coffee is not as good as mine.

            A. Mine is better than yours.

            B. My coffee is better than your.

            C. My coffee is better than yours.

            D. My coffee is more good than yours.

6. I can’t cook as well as my mother does.

            A. My mother can cook better than I can.

            B. My mother can’t cook better than I can.

            C. My mother can cook well than I can.

            D. I can cook better than my mother can.

7. Murder is the most serious of all crimes.

            A. Murder is very serious.

            B. No crime is more serious than murder.

            C. Everyone is very afraid of murder.

            D. Murder is the dangerous crime.

8. No one in this class as tall as peter.

            A. Peter is taller than in this class.

            B. Peter is the tallest in this class.

            C. Peter is the most tall in this class.

            D. Peter is more tall than in this class.

9. This is the best music I have ever heard.

            A. I‘ve ever heard better music than this.

            B. I‘ve ever heard such a good music as this.

            C. I‘ve ever heard so good music as this.

            D. This is the first time I‘ve heard this good music.

10. People dive fast. Many accidents happen.

A. The faster people drive, the more accidents happen.

B. The more fast people drive, the more accidents happen.

C. The much fast people drive, the more accidents happen.

D. The faster people drive, the much accidents happen.

8. I meet him much. I hate him much.

A. The better I meet him, the more I hate him.

B. The more time I meet him, the more I hate him.

C. The more I meet him, the more I hate him.

D. The better I meet him, the better I hate him

.II. Give the suitable comparion to complete each sentence. (cho dạng so sánh đúng)

1. The weather today is………. than it was yesterday. ( hot )

2. The ……….. city in Canada is Toronto. ( large )

3. This story is ………….. than that one. ( funny )

4. I’m taking four classes. My history class is the  ………… of all.

( interesting )

5. The Pacific is …………. than the Mediterranean Sea. ( deep )

6. You can write ……………… than I can ( well )

7. My father drives  ………………. than I do. ( carefully )

8. Indonesia is…….. than Japan in population. ( large )

9. Mt. Everest is …………… mountain in the world. ( high )

10. __________ my grandparents get, _____________ they are. (old – happy)

11. __________ it is, ___________ Hoa is. (hot – weak)

1
2 tháng 8 2021

I. Choose one sentence that best rewrites the sentence given:

1.      They understand more than we do.

A.    We don’t understand as much as they do.

B.    We  don’t understand anything at all.

C.    They understand everything inside out.

D.    They are very intelligent.

2.      It is much more difficult to speak English than to speak French.

      A. To speak French is more difficult than to speak English.

      B. To speak English is more difficult than to speak French.

      C. Speaking English is more difficult than to speak French.

      D. Speaking French is not as difficult as to speaking English.

3.      My interview lasted longer than yours.

      A. Your interview wasn’t as short as mine.

      B. Your interview was shorter than mine.

      C. Your interview was as long as mine.

      D. Your interview was longer than mine.

4.      When I was younger, I used to go climbing more than I do now.

      A. Now I don’t go climbing anymore.

      B. I used to go climbing when I was younger.

      C. Now I don’t go climbing as much as I did.

      D. I don’t like going climbing any more.

5. Your coffee is not as good as mine.

            A. Mine is better than yours.

            B. My coffee is better than your.

            C. My coffee is better than yours.

            D. My coffee is more good than yours.

6. I can’t cook as well as my mother does.

            A. My mother can cook better than I can.

            B. My mother can’t cook better than I can.

            C. My mother can cook well than I can.

            D. I can cook better than my mother can.

7. Murder is the most serious of all crimes.

            A. Murder is very serious.

            B. No crime is more serious than murder.

            C. Everyone is very afraid of murder.

            D. Murder is the dangerous crime.

8. No one in this class as tall as peter.

            A. Peter is taller than in this class.

            B. Peter is the tallest in this class.

            C. Peter is the most tall in this class.

            D. Peter is more tall than in this class.

9. This is the best music I have ever heard.

            A. I‘ve ever heard better music than this.

            B. I‘ve ever heard such a good music as this.

            C. I‘ve ever heard so good music as this.

            D. This is the first time I‘ve heard this good music.

10. People dive fast. Many accidents happen.

A. The faster people drive, the more accidents happen.

B. The more fast people drive, the more accidents happen.

C. The much fast people drive, the more accidents happen.

D. The faster people drive, the much accidents happen.

8. I meet him much. I hate him much.

A. The better I meet him, the more I hate him.

B. The more time I meet him, the more I hate him.

C. The more I meet him, the more I hate him.

D. The better I meet him, the better I hate him

.II. Give the suitable comparion to complete each sentence. (cho dạng so sánh đúng)

1. The weather today is……hottest…. than it was yesterday. ( hot )

2. The ……largest ….. city in Canada is Toronto. ( large )

3. This story is ………funnier….. than that one. ( funny )

4. I’m taking four classes. My history class is the  ……most interesting…… of all.

( interesting )

5. The Pacific is ………deeper…. than the Mediterranean Sea. ( deep )

6. You can write …………better…… than I can ( well )

7. My father drives  ………more carefully………. than I do. ( carefully )

8. Indonesia is……larger.. than Japan in population. ( large )

9. Mt. Everest is ………the highest…… mountain in the world. ( high )

10. _______ths older___ my grandparents get, ________the happier_____ they are. (old – happy)

 

11. ______the hotter____ it is, ________the weaker___ Hoa is. (hot – weak)

 

18 tháng 7 2021

10 to lock

11 to take

12 to smoke

13 to see

14 to think , deciding, to strike

15 telephoning,asking, to look

16 listening, hearing

17 driving, being driven

18 to make, to do

19 to forget,  worrying

20 watching

18 tháng 7 2021

10, locking

11, to take

12,to smoke

13,to see

14,to, deciding, tostrike

15,telephoning,asking, to look

16,listening, hearing

17,driving, being driven

18,to make, to do

19,to forget, to worry

20, to watch

BC=căn 12^2-9^2=3căn 7(km)

Số tiền cần làm là:

3*căn 7*50000=396862,7(đồng)

cs ai biết làm bài này k giúp mình vs mình đang cần gấp (xin cảm ơn)I. Choose one sentence that best rewrites the sentence given:1.      They understand more than we do.A.    We don’t understand as much as they do.B.    We  don’t understand anything at all.C.    They understand everything inside out.D.    They are very intelligent.2.      It is much more difficult to speak English than to speak French.      A. To speak French is more difficult than to speak English.      B. To speak...
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cs ai biết làm bài này k giúp mình vs mình đang cần gấp (xin cảm ơn)

I. Choose one sentence that best rewrites the sentence given:

1.      They understand more than we do.

A.    We don’t understand as much as they do.

B.    We  don’t understand anything at all.

C.    They understand everything inside out.

D.    They are very intelligent.

2.      It is much more difficult to speak English than to speak French.

      A. To speak French is more difficult than to speak English.

      B. To speak English is more difficult than to speak French.

      C. Speaking English is more difficult than to speak French.

      D. Speaking French is not as difficult as to speaking English.

3.      My interview lasted longer than yours.

      A. Your interview wasn’t as short as mine.

      B. Your interview was shorter than mine.

      C. Your interview was as long as mine.

      D. Your interview was longer than mine.

4.      When I was younger, I used to go climbing more than I do now.

      A. Now I don’t go climbing anymore.

      B. I used to go climbing when I younger.

      C. Now I don’t go climbing as much as I did.

      D. I don’t like going climbing any more.

5. Your coffee is not as good as mine.

            A. Mine is better than yours.

            B. My coffee is better than your.

            C. My coffee is better than yours.

            D. My coffee is more good than yours.

6. I can’t cook as well as my mother does.

            A. My mother can cook better than I can.

            B. My mother can’t cook better than I can.

            C. My mother can cook well than I can.

            D. I can cook better than my mother can.

7. Murder is the most serious of all crimes.

            A. Murder is very serious.

            B. No crime is more serious than murder.

            C. Everyone is very afraid of murder.

            D. Murder is the dangerous crime.

8. No one in this class as tall as peter.

            A. Peter is taller than in this class.

            B. Peter is the tallest in this class.

            C. Peter is the most tall in this class.

            D. Peter is more tall than in this class.

9. This is the best music I have ever heard.

            A. I‘ve ever heard better music than this.

            B. I‘ve ever heard such a good music as this.

            C. I‘ve ever heard so good music as this.

            D. This is the first time I‘ve heard this good music.

10. People dive fast. Many accidents happen.

A. The faster people drive, the more accidents happen.

B. The more fast people drive, the more accidents happen.

C. The much fast people drive, the more accidents happen.

D. The faster people drive, the much accidents happen.

8. I meet him much. I hate him much.

A. The better I meet him, the more I hate him.

B. The more time I meet him, the more I hate him.

C. The more I meet him, the more I hate him.

D. The better I meet him, the better I hate him

.II. Give the suitable comparion to complete each sentence. (cho dạng so sánh đúng)

1. The weather today is………. than it was yesterday. ( hot )

2. The ……….. city in Canada is Toronto. ( large )

3. This story is ………….. than that one. ( funny )

4. I’m taking four classes. My history class is the  ………… of all.

( interesting )

5. The Pacific is …………. than the Mediterranean Sea. ( deep )

6. You can write ……………… than I can ( well )

7. My father drives  ………………. than I do. ( carefully )

8. Indonesia is…….. than Japan in population. ( large )

9. Mt. Everest is …………… mountain in the world. ( high )

10. __________ my grandparents get, _____________ they are. (old – happy)

11. __________ it is, ___________ Hoa is. (hot – weak)

III. Rewrite the second sentence in such a way that it has the same meaning as the one before it

1. Jane can swim further than I can

I can’t_____________________________________________________________________

2. My sister can’t cook as well as my mother does

My mother can______________________________________________________________

3. I don’t play tennis as well as my brother does

My brother__________________________________________________________________

4. Apples are usually cheaper than oranges

Apples are not_______________________________________________________________

5. Cats can’t swim as well as dogs can

Dogs can___________________________________________________________________

6. The dress is cheaper than the skirt

The dress is not______________________________________________________________

7. Peter is the tallest boy in his class

No one ____________________________________________________________________

8. Nobody in the class is cleverer than Sally

Sally is ____________________________________________________________________

9. Have you got a cheaper carpet than this?

Is this _____________________________________________________________________

10. They understand more than we do

We don’t ___________________________________________________________________

11. Tom is the best football player in this team

Nobody____________________________________________________________________

12. Nothing is faster than the speed of light

The speed of light____________________________________________________________

13. His mother is taller than his father

His father is not _____________________________________________________________

14. She’s a faster and more careless driver than I am

She drives __________________________________________________________________

15. Jane is a better cook than Robert

Robert can’t   …………………………………………………………………..

1
2 tháng 8 2021

I. Choose one sentence that best rewrites the sentence given:

1.      They understand more than we do.

A.    We don’t understand as much as they do.

B.    We  don’t understand anything at all.

C.    They understand everything inside out.

D.    They are very intelligent.

2.      It is much more difficult to speak English than to speak French.

      A. To speak French is more difficult than to speak English.

      B. To speak English is more difficult than to speak French.

      C. Speaking English is more difficult than to speak French.

      D. Speaking French is not as difficult as to speaking English.

3.      My interview lasted longer than yours.

      A. Your interview wasn’t as short as mine.

      B. Your interview was shorter than mine.

      C. Your interview was as long as mine.

      D. Your interview was longer than mine.

4.      When I was younger, I used to go climbing more than I do now.

      A. Now I don’t go climbing anymore.

      B. I used to go climbing when I younger.

      C. Now I don’t go climbing as much as I did.

      D. I don’t like going climbing any more.

5. Your coffee is not as good as mine.

            A. Mine is better than yours.

            B. My coffee is better than your.

            C. My coffee is better than yours.

            D. My coffee is more good than yours.

6. I can’t cook as well as my mother does.

            A. My mother can cook better than I can.

            B. My mother can’t cook better than I can.

            C. My mother can cook well than I can.

            D. I can cook better than my mother can.

7. Murder is the most serious of all crimes.

            A. Murder is very serious.

            B. No crime is more serious than murder.

            C. Everyone is very afraid of murder.

            D. Murder is the dangerous crime.

8. No one in this class as tall as peter.

            A. Peter is taller than in this class.

            B. Peter is the tallest in this class.

            C. Peter is the most tall in this class.

            D. Peter is more tall than in this class.

9. This is the best music I have ever heard.

            A. I‘ve ever heard better music than this.

            B. I‘ve ever heard such a good music as this.

            C. I‘ve ever heard so good music as this.

            D. This is the first time I‘ve heard this good music.

10. People dive fast. Many accidents happen.

A. The faster people drive, the more accidents happen.

B. The more fast people drive, the more accidents happen.

C. The much fast people drive, the more accidents happen.

D. The faster people drive, the much accidents happen.

8. I meet him much. I hate him much.

A. The better I meet him, the more I hate him.

B. The more time I meet him, the more I hate him.

C. The more I meet him, the more I hate him.

D. The better I meet him, the better I hate him

.II. Give the suitable comparion to complete each sentence. (cho dạng so sánh đúng)

1. The weather today is……hotter…. than it was yesterday. ( hot )

2. The ……largest….. city in Canada is Toronto. ( large )

3. This story is ……funnier…….. than that one. ( funny )

4. I’m taking four classes. My history class is the  ……most interesting…… of all.

( interesting )

5. The Pacific is ………deeper…. than the Mediterranean Sea. ( deep )

6. You can write ………better……… than I can ( well )

7. My father drives  …………more carefully……. than I do. ( carefully )

8. Indonesia is…larger….. than Japan in population. ( large )

9. Mt. Everest is ………the highest…… mountain in the world. ( high )

10. ____the older______ my grandparents get, _______the happier______ they are. (old – happy)

11. _____the hotter_____ it is, _______the weaker____ Hoa is. (hot – weak)

III. Rewrite the second sentence in such a way that it has the same meaning as the one before it

1. Jane can swim further than I can

I can’t swim as far as Jane.

2. My sister can’t cook as well as my mother does

My mother can cook better than my sister.

3. I don’t play tennis as well as my brother does

My brother plays tennis better than me.

4. Apples are usually cheaper than oranges

Apples are not usually as cheap as apples.

5. Cats can’t swim as well as dogs can

Dogs can swim better than cats.

6. The dress is cheaper than the skirt

The dress is not as cheap as the dress.

7. Peter is the tallest boy in his class

No one in his class is as tall as Peter.

8. Nobody in the class is cleverer than Sally

Sally is the cleverest in the class.

9. Have you got a cheaper carpet than this?

Is this the cheapest carpet you have got?

10. They understand more than we do

We don’t understand as much as them.

11. Tom is the best football player in this team

Nobody in this team plays football as good as Tom.

12. Nothing is faster than the speed of light

The speed of light is the fastest.

13. His mother is taller than his father

His father is not as tall as his mother.

14. She’s a faster and more careless driver than I am

She drives faster and more carelessly than I do.

15. Jane is a better cook than Robert

Robert can’t cook as well as Jane.

2 tháng 8 2021

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Tham khảo

In recent years, distance teaching and learning has become increasingly popular among the students and this is perceived differently by learners. Many students perceive this as a beneficial aid in learning while others think that they are not as much effective as classroom teaching. This essay will discuss about the merits and demerits of distant learning. Studying an online course provides a flexible timing and less budgeted learning for students. They are able to learn their desire course and subjects on their suitable time. This gives a great opportunity for learners to gain new skills and strengthen their knowledge level staying in their own place. For instance, a Nepali student who wants an Australian degree in business management course does not have to stay in Australia, he can study online and complete course staying at his home. Hence, distant learning is economic and time saving. However, online courses give more emphasis on the theoretical part of learning and there is less teacher and student interaction. It lacks the practical aspects of learning and encourage the passive learning. This is very obvious that students find it as a less effective learning than in the classroom. A recent study suggests that a greater number of students found classroom teaching far more effective than the distance learning. In conclusion, the ever growing availability of online learning has gained its popularity among the young adults for many years, which is perceived as beneficial by many people while others find it to be less effective. The emphasis can be given to its effectiveness to establish it as the most cost effective learning than the classroom teaching.

Tiếng Việt 

Trong những năm gần đây, hình thức dạy và học từ xa ngày càng trở nên phổ biến trong sinh viên và điều này được người học nhìn nhận khác nhau. Nhiều sinh viên coi đây là một trợ giúp hữu ích trong việc học trong khi những người khác cho rằng chúng không hiệu quả bằng việc giảng dạy trên lớp. Bài luận này sẽ thảo luận về những giá trị và phẩm chất của việc học xa. Học một khóa học trực tuyến cung cấp một thời gian linh hoạt và học tập ít tốn ngân sách hơn cho sinh viên. Họ có thể học khóa học và môn học mong muốn của mình vào thời gian phù hợp. Điều này tạo cơ hội tuyệt vời cho người học để đạt được các kỹ năng mới và củng cố trình độ kiến ​​thức của họ ở vị trí của chính họ. Ví dụ, một sinh viên Nepal muốn có bằng Úc về khóa học quản lý kinh doanh không phải ở lại Úc, anh ta có thể học trực tuyến và hoàn thành khóa học tại nhà của mình. Do đó, học từ xa là kinh tế và tiết kiệm thời gian. Tuy nhiên, các khóa học trực tuyến tập trung nhiều hơn vào phần lý thuyết của việc học và có ít sự tương tác giữa giáo viên và học sinh hơn. Nó thiếu các khía cạnh thực tế của học tập và khuyến khích học tập thụ động. Điều này rất rõ ràng rằng học sinh thấy rằng nó là một học tập kém hiệu quả hơn trong lớp học. Một nghiên cứu gần đây cho thấy rằng một số lượng lớn sinh viên nhận thấy việc giảng dạy trên lớp hiệu quả hơn nhiều so với hình thức học tập từ xa. Tóm lại, sự phổ biến ngày càng tăng của việc học trực tuyến đã trở nên phổ biến trong giới trẻ trong nhiều năm, điều này được nhiều người cho là có lợi trong khi những người khác lại thấy nó kém hiệu quả hơn. Có thể nhấn mạnh đến tính hiệu quả của nó để xác định nó là phương pháp học tập hiệu quả nhất về chi phí so với việc giảng dạy trên lớp.

22 tháng 8 2021

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