Người ta thả 1 miếng đồng có khối lượng m₁ = 0,2kg đã được đốt nóng đến nhiệt độ t₁ vào 1 nhiệt lượng kế chứa m₂ = 0,28kg nước ở nhiệt độ t₂ = 20$°$C. Nhiệt độ khi có cân bằng nhiệt là t₃ = 80$°$C. Biết nhiệt dung riêng, khối lượng riêng của đồng và nước lần lượt là c₁ = 400J/kgK; D₁ = 8900kg/m³, c₂ = 4200J/kgK; D₂ = 1000 kg/m³; nhiệt hóa hơi của nước là L = 2,3.10⁶ J/kg. Bỏ qua sự tác dụng nhiệt với nlk và với môi trường.
1. Xác định nhiệt độ ban đầu t₁ của đồng.
2. Sau đó, người ta thả thêm 1 miếng đồng khối lựng m₃ cũng nhiệt độ t₁ và nlk thì khi lập lại CBN, mực nước trong nlk vẫn bằng mực nước trước khi thả miếng đồng m₃. Xác định khối lượng miếng đồng m₃.

Choose the best answer A, B, C or D to complete the following sentences

7. The custom of sending a greeting in a card had become a ________ tradition.
A. deeply-rooted
B. deeply-root
C. deep-root
D. deep-rooted

8. This army course is not a place to relax. It has a(n) ________ schedule, with strict timetables and hard training sessions.
A. magnificent
B. army-like
C. forgettable
D. enjoyable

Fill in each blank with a word from the box. of/are/us/plants/but/because/growing/buy Most of us have a hobby or some, (1)____________________ hobbies differ from person to person.Gardening is a relaxing hobby that can be enjoyed by people from any age group.There (2)_____________ various ways by which gardening can offer us relaxation. Gardening gives (3)_______________ an opportunity to refresh our mind after working or studying time.It brings us the green (4) _________ and flowers and fills our lungs with pure oxygen.The outdoor enironment and fresh air are good for our health.We can get great pleasure from gardening (5) ________ flowers and some vegetables of the season.Gardening not only offers us the beauty (6) ___________ flowers and plants but also brings us benefits.A family with a vegetable garden can save a lot of money when they grow vegetables rather than (7) _______________ thêm from outside.Vegetable gardening is very rewarding (8) __________________ it makes us feel better,less stressed and produces delicious vegetables for us to eat. Viết đáp án và giải thích ạ , như này ạ: 1. đáp án

Phần 1. Đọc - hiểu ( 4,0 điểm)

"Tổ quốc là tiếng mẹ

Ru ta từ trong nôi

Qua nhọc nhằn năm tháng

Nuôi lớn ta thành người

Tổ quốc là mây trắng

Trên ngút ngàn Trường Sơn

Bao người con ngã xuông

Cho quê hương mãi còn

Tổ quốc là cây lúa

Chín vàng mùa ca dao

Như dáng người thôn nữ

Nghiêng vào mùa chiêm bao ....

(Trích Tô quôc là tiêng mẹ - Nguyễn Việt Chiên)

treo với cheo có gì khác nhau

20. Choose the best option to complete the sentence. (5 Points)

I usually help my mother __________ the housework after school.

( ) go
( ) study
( ) have
( ) play

Hình ảnh 1: Bài tập sắp xếp câu (Unit 1: My New School)
XI. Put the following words and phrases in the correct order to make sentences.

1.forgets/ Tom/ his homework/ never/ to do.
2.rarely/ my mobile phone/ in the classroom/ use/ I.
3.football/ he/ after school/ always/ Does/ play?
4.don't/ their bicycles/ ride/ to school/ often/ The students.
5.her mother/ Susan/ to do/ helps/ the housework/ sometimes.
6.you/ at home/ usually/ in the evening/ Are?

Hình ảnh 2: Bài tập chọn đáp án đúng (Tiếng Anh 8 - Global Success)
Read the passage and choose the correct answer.

Last summer, Long went (1) _________ a holiday for two weeks to the island of Cat Ba. He (2) _________ a hotel which had a wonderful swimming pool and beautiful views of the sea. It was in a village where the local people went fishing in the winter, and foreign visitors came in the summer. Long spent his first day on the beach, but on the second day he felt very ill. First, he was too hot, then he was too cold. He couldn't understand why he felt (3) _________ that. So he went to see the local doctor, who was a very nice man, and (4) _________ voice was so sweet.

"Summer is a time when people often feel ill," the doctor said. "It's too hot for most of us! (5) _________ this medicine, and stay out of the sun." Long took the doctor's (6) _________ and stayed in his room for the rest of his holiday. He soon felt better. "What a cheap holiday!" he thought happily.

Các lựa chọn đáp án:

1.A. to            B. for            C. on            D. in
2.A. lived        B. rented        C. hired        D. stayed
3.A. like          B. as              C. so             D. $\emptyset$
4.A. spoke       B. an              C. who           D. whose
5.A. Eat           B. Drink          C. Take          D. Have
6.A. chance      B. advice         C. opportunity D. advise

Hình ảnh 3: Bài tập viết lại câu (Rewriting Sentences)
IX. Rewrite the sentences without changing the meaning.

1.I spend 15 minutes walking from here to my school.

It ____________________________________________________________________
2.My house is not far from your house.

It ____________________________________________________________________
3.You can come there by bus.

You ___________________________________________________________________
4.My house is about 3km from the National Library.

It ____________________________________________________________________
5.What is the distance between the board and the first student's desk?

How ___________________________________________________________________
6.Is the movie theater far from the restaurant?

It ____________________________________________________________________

Exercise 1. Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions. The Amazon rainforest is home to more than a third of all the world's species of plants, birds and animals. Twenty per cent of all the birds in the world live in the rainforest. Scientists have discovered thousands of types of plants and animals that can only be found there. There are thousands - probably millions more that we haven't discovered yet. There are at least 2.5 million species of insects there. Imagine what would happen if they all lost their home? It couldn't happen, could it? Unfortunately, it's happening right now. Yet, the rainforest is big. But it's getting smaller. The problem is that people are cutting down the trees, mainly to make room for cows. These provide meat and make money for their owners. This process of cutting down trees is called ‘deforestation'. The good news is that it is slowing down. In 2004, for example, more than 27,000 square kilometres were cut down. That's an area bigger than Wales. In 2006, because of all the campaigns to save rainforest, it dropped to just over 13,000 square kilometres. The bad news is that it's not enough. Scientists predict that by 2030, the rainforest will have become smaller by 40%. It's possible that by the end of the 21st century, the rainforest will have completely disappeared. With deforestation, thousands of the animals, birds, fish and plants that live in the Amazon rainforest lose their home, their natural habitat. Some of them move to other areas, but most of them die. Many species have already become extinct, and many more will if deforestation continues. That will change the balance of life in the rainforest and could cause enormous problems to the region's ecosystem. There's another problem too. Trees and plants are a vital source of oxygen. If we cut them down, we lose that oxygen. But it's worse than just that. With deforestation, the trees and plants are burnt. This sends gases into the Earth's atmosphere, which stops some of the Earth's heat escaping. That then leads to the temperature here on the ground going up. This increase in the world's temperature is called 'global warming', and most scientists believe it's a very serious issue. If they stopped deforestation, it might help prevent global warming

Question 1: Which title best summarises the main idea of the passage?

A. Chances for owners of cow ranches B. Threats to Amazon rainforest C. Global warming effects D. Habitat destruction Dẫn chứng/giai thích:..............................................................

Question 2: According to the passage, which of the following is TRUE?

A. A fifth of all the birds in the world live in the rainforest. B. 20% of all the animals in the world live in the rainforest. C. Nearly two million species of insects are found in the Amazon rainforest. D. Nearly half of the world's species of plants grow there. Dẫn chứng/ Giải thích:………………………………………………………………….

Question 3: In paragraph 1, the word "room” is closest in meaning to ____.

A. chamber B. flat C. area D. studio Dẫn chứng/ Giải thích:………………………………………………………………….

Question 4: In paragraph 2, the word "it” refers to ____.

A. room B. process C. rainforest D. deforestation Dẫn chứng/ Giải thích:………………………………………………………………….

Question 5: According the passage, which of the following is TRUE about Amazon rainforest?

A. It has become smaller by 40%. B. The deforestation is decreasing. C. 25% of animal species are extinct now. D. The deforestation is under control. Dẫn chứng/ Giải thích:…………………………………………………………………. .

Question 6: In paragraph 2, the word “enormous” is closest in meaning to ____.

A. serious B. important C. common D. insignificant Dẫn chứng/ Giải thích:…………………………………………………………………. .

Question 7: What might help to restrain global warming?

A. increasing deforestation B. stabilising deforestation C. stop cutting down trees D. clearing more trees for farming Dẫn chứng/ Giải thích:………………………………………………………………….

Question 8: In the final paragraph, the word "increase” is closest in meaning to ____.

A. rise B. decrease C. degrade D. minify Dẫn chứng/ Giải thích:………………………………………………………………….

The doctor advised me jogging every morning . A went B go C to go D going

Điệp ngữ và điệp cấu trúc khác nhau ở chỗ nào . Đó là.....Đó là ....Đó là ....( Là điẹp cấu trúc hay điệp ngữ)

2. Choose the correct answer A, B, C or D in each line.
1.Nam is very _____. He takes part in many school activities.
A. sociable  B. society  C. social  D. reserved
2.My younger sister has found a _____ kit in the storage.
A. CD  B. origami  C. craft  D. book
3.Most students are interested in _____ sports.
A. to play  B. playing  C. play  D. plays
4.You use “_____” to giving your opinion.
A. according to  B. as I have noted  C. in my opinion  D. in short
5.Remember that it’s easy to _____ online.
A. lie  B. lying  C. true  D. dishonest
6.Peter enjoys _____ origami with his friends at recess.
A. making  B. make  C. to make  D. makes
7.Some parents are thinking of banning children from _____ the computer.
A. to using  B. to use  C. use  D. using
8.The _____ is the head of school or college.
A. principal  B. president  C. prince  D. princess
9.We use phrase “_____” to summary our opinion.
A. in my opinion  B. for these reasons  C. in addition  D. firstly
10.Lan is hooked _____ K-pop.
A. at  B. on  C. in  D. to
11.He regrets _____ school early. It is the biggest mistake in his life.
A. left  B. leaving  C. to leave  D. leave
12.Mark gets the first _____ in IOE contest.
A. present  B. prize  C. price  D. president
13.When you do _____ such as football, volleyball, you develop team spirit.
A. outdoor activities  B. team sports  C. indoor activities  D. individual activities
14.Nick does leisure activities in his free time which makes he feels _____.
A. clever  B. stress  C. boring  D. relaxing

How do our sales compare with those of other firms? RELATION How do .........................................................................................................................................

VIII. Match a sentence in column A to a response in column B.
A

1.When I was young, I was isolated by my friends because I was so reserved.
2.I used to try riding on the dogsled in my trip to Canada.
3.A lot of people sacrificed their lives for the peace of our country.
4.Would you mind if I read your diary a little bit, mom?
5.Years ago, students had to do manual work as a part of their studies.
6.Do you want to experience your childhood again, dad?
7.Do you think I could use your cell phone for a moment?
8.My mom got married to my dad when she was 16 years old.
B

a. I suppose I do. I wish I were a child once more time.
b. I think it’s a good way to foster “love and respect” for manual labor.
c. I can’t imagine that.
d. Unbelievable! Why did she marry too soon?
e. Sure, no problem. Here you are.
f. I respect them for what they did.
g. I’d rather you didn’t.
h. It must be an incredible ride. I wish I could do that once in my life.

IV. Complete the sentences with the right form of the words in BOLD.

1.They are campaigning for immediate ______ for cultural heritages.
PROTECT
2.The event ______ hoped to raise enough funds for a coming local festival.
ORGANISE
3.Our nation takes great ______ in the rich cultural values.
PROUD
4.This festival is ______ with the wet rice civilisation.
ASSOCIATE
5.You can make these handicrafts if you make ______ of how to make them.
OBSERVE

V. Choose the correct answer A, B, C, or D to complete the sentences.

1.The custom of sending a greeting in a card had become a ______ tradition.
A. deeply-rooted
B. deeply-root
C. deep-root

what benefits do you think you can get from sharing housework? Viết thành đoạn văn ạ

18. "Would you like some soup? I .........................some" - "Yes. please. It's my favorite food." A. make B. made C. will make D. have made

Nêu các biện pháp nghệ thuật trong bài "Thu vịnh" của Nguyễn Khuyến và chỉ ra tác dụng

I. Write complete sentences using the cues given. 1. Elizabeth / enjoy / listen to / Vietnamese folf song's melodies ______________________________________________________________

2. He / need / buy / some tools / fix / dog house / this weekend ______________________________________________________________

3. Play / online game / have / both / positive / negative effects

Question 4. Face masks               all the time or you will catch the virus.

A. must wear B. are wearing C. have worn             D. must be worn
Question 5. The famous singer               a bunch of flowers backstage.

A. gives B. gave C. was given              D. had given

Last summer Hugo went (1) _________ holiday for two weeks to the island of Sardinia. He (2) _________ in a hotel which had a wonderful swimming pool and beautiful views of the sea. It was in a village where the local people went fishing (3) _________ the winter, and foreign visitors came in the summer. Hugo spent (4) _________ first day on the beach, but on the second day he felt very ill. First he was (5) _________ hot, then he was too cold. He couldn’t understand why he felt like that. So he went to see the local doctor, (6) _________ was a very nice man. "Summer is a time when people often ill," the doctor said. "It's too hot for (7) _________ of us! (8) _________ this medicine, and stay out of the sun" Hugo took the doctor's (9) _________, and stayed in his room for the rest of his holiday. He soon felt better. "(10) _________ a cheap holiday!" he thought happily.

When l was waiting for the bus,I.......... (see) my close friend

Trong câu thơ "sáo diều trong gió ngân nga " ,từ ngân nga có nghĩa gì

Tìm lỗi sai và sửa

1. The police arrested the man while he is having dinner in a restaurant.

2. Peter and Wendy first met in 2006, and they are married for three years now.

3. Recently, the island of Hawaii had been the subject of intensive research on the occurrence of earthquakes.

4. Every morning, the sun shines in my bedroom window and waking me up.

5. The man died as a result of falling asleep while he drives.