Trong phản ứng 2H₂ + O₂ → 2H₂O, các nguyên tử H đã góp bao nhiêu electron vào việc hình thành liên kết hoá học trong 1 phân tử nước?

Theo quy định của pháp luật, đối tượng chịu thuế ở nước ta là ai?

Bạn An muốn mua một cây bút mực và một cây bút chì. Các cây bút mực có 8 màu khác nhau, các cây bút chì cũng có 8 màu khác nhau. Như vậy bạn An có bao nhiêu cách chọn.

Khu vực nào sau đây chịu tác động rất nhỏ của nạn đói trên thế giới?

Read of the following leaflet and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 7 to 12.

Diversity Unleashed: Your Passport to 2025

Join us for a global (7)_________ of cultures, ideas, and innovation!

Some travelers prefer adventure holidays, while (8)_________ enjoy relaxing at resorts. We offer both!

Our skilled teachers will help you (9)_________ basic language skills before your cultural exchange program. (10)_________ cultural differences, we explore unique perspectives through interactive workshops.

Experience culinary (11)_________ from six continents prepared by master chefs. (12)_________ of opportunities are available for networking with global professionals.

Diversity Unleashed 2025 - Discover, Connect, Transform!

Book your spot today:

Early Bird Registration: Until March 31, 2025

Regular Registration: April 1 - June 30, 2025

Website: www.diversity2025.com

Email: info@diversity2025.com

Phone: (555) 123-4567

Tính \(\lim _{x \rightarrow-1} \frac{\sqrt{2+x}-1}{x+1}\)

Cho hàm số \(y=\frac{2 x+1}{x-2}\) có đồ thị \((C)\). Hỏi có tất cả bao nhiêu điểm thuộc đồ thị \((C)\) mà tiếp tuyến của \((C)\) tại điểm đó tạo với hai trục tọa độ một tam giác có diện tích bằng \(\frac{2}{5}\)?

Trường hợp nào sau đây là lỗi thiếu mạch lạc?

Sự phân bố các cơ sở chăn nuôi thường được biểu hiện bằng phương pháp gì?

Read the following passage about world festivals and mark the best answer to the questions from 11 to 18. 

     World festivals have a big impact on young people today. Festivals such as Christmas, Diwali, Halloween, and Chinese New Year are celebrated across the globe, bringing people together. Young people especially enjoy these events because they offer a chance to have fun, learn about different cultures, and develop a global mindset.

     Festivals help young people appreciate diversity. Attending a festival from another culture teaches them new traditions, food, music, and art. For example, attending the Rio Carnival or the Holi Festival of Colors can give young people an exciting experience of new cultures. They learn to respect and understand people from different backgrounds, which is important in today’s world.

     Another impact is that festivals allow young people to express themselves creatively. Many festivals include costumes, dances, and music that encourage self-expression. For instance, during Halloween or a music festival like Coachella, young people often wear creative outfits or costumes that reflect their personalities. This makes them feel confident and allows them to experiment with new styles.

    Festivals also offer opportunities for young people to connect with others. Meeting people at festivals, whether in person or online, helps them build friendships and networks. Social media plays a big role in this, as many young people post about their experiences, spreading awareness of the festivals they attend.

     Overall, world festivals provide many learning and social experiences for young people, helping them grow into more open-minded and creative individuals. 

The word “opportunities” in paragraph 4 is closest in meaning to _____.

Nguyễn Dữ là con trai của ai?

Sự đa dạng loại hình du lịch ở nước ta hiện nay do tác động chủ yếu của các nhân tố nào sau đây?

Nguyên nhân sâu sa để thực dân Pháp tổ chức đánh chiếm Bắc Kì lần thứ nhất (1873) là gì?

Một hộp đựng $6$ quả cầu xanh và $3$ quả cầu màu đỏ, có cùng kích thước và khối lượng. Chọn ngẫu nhiên hai quả cầu trong hộp. Xác suất để chọn được hai quả cầu cùng màu là

Mark the letter A, B, C or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of thefollowing questions from 13 to 17.

a. Nina: Almost! I just need to add a few final touches. It’s been a fun but challenging project.

b. Alex: Have you finished your painting for the art exhibit?
c. Alex: I’m sure it’ll turn out amazing. Your work always impresses us!

Read the following passage about powering and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40.

     As we continue to face the impacts of climate change, having a green environment has become increasingly important to the future of our society. To achieve this, the world is shifting towards green energy, and two particular types of energy at the centre of this movement are solar power and wind power.

     [I] Solar power is all about harnessing the energy of the sun by using solar panels to convert sunlight into usable electricity. [II]. Moreover, solar panels are perfect for installation on a small scale, such as in private homes, since they require very little maintenance and have a long lifespan. [III] However, the ability to generate solar power depends on the time of day and weather conditions. This means that solar panels are often less useful if they are installed in places where sunny weather is not typical. [IV]

     Wind power, on the other hand, involves converting the energy of the wind into electricity using large turbines. Wind power doesn’t produce any greenhouse gases, but it is not ideal for private use since turbines require consistent care. However, wind farms can be installed on a large scale and are able to produce electricity continuously regardless of the time of day. This means that if there were more investments in wind power, it could be a viable way to provide energy for major cities and even for whole regions.

     Wind and solar power contribute significantly to a green environment by reducing our reliance on fossil fuels, helping us cut down on pollution and slow climate change. Additionally, using renewable energy sources helps promote spending on sustainable development by creating new career opportunities in the green energy sector.

     For now, the biggest challenge of adopting green energy is the costs associated with installation and infrastructure, but the benefits unquestionably outweigh the downsides. If we want to stop the climate crisis and create a better and more sustainable future, green energy sources will undoubtedly be the key.

Which of the following can be inferred from the passage?

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions:

            For many people who live in cities, parks are an important part of the landscape. They provide a place for people to relax and play sports, as well as a refuge from the often harsh environment of a city. What people often overlook is that parks also provide considerable environmental benefits.

            One benefit of parks is that plants absorb carbon dioxide - a key pollutant - and emit oxygen, which humans need to breathe. According to one study, an acre of trees can absorb the same amount of carbon dioxide that a typical car emits in 11,000 miles of driving. Parks also make cities cooler. Scientists have long noted what is called the Urban Heat Island Effect: building materials such as metal, concrete, and asphalt absorb much more of the sun’s heat and release it much more quickly than organic surfaces like trees and grass. Because city landscapes contain so much of these building materials, cities are usually warmer than surrounding rural areas. Parks and other green spaces help to mitigate the Urban Heat Island Effect.

            Unfortunately, many cities cannot easily create more parks because most land is already being used for buildings, roads, parking lots, and other essential parts of the urban environment. However, cities could benefit from many of the positive effects of parks by encouraging citizens to create another type of green space: rooftop gardens. While most people would not think of starting a garden on their roof, human beings have been planting gardens on rooftops for thousands of years. Some rooftop gardens are very complex and require complicated engineering, but others are simple container gardens that anyone can create with the investment of a few hundred dollars and a few hours of work.

            Rooftop gardens provide many of the same benefits as other urban park and garden spaces, but without taking up the much-needed land. Like parks, rooftop gardens help to replace carbon dioxide in the air with nourishing oxygen. They also help to lessen the Urban Heat Island Effect, which can save people money.

            In the summer, rooftop gardens prevent buildings from absorbing heat from the sun, which can significantly reduce cooling bills. In the winter, gardens help hold in the heat that materials like brick and concrete radiate so quickly, leading to savings on heating bills. Rooftop vegetable and herb gardens can also provide fresh food for city dwellers, saving them money and making their diets healthier. Rooftop gardens are not only something everyone can enjoy, they are also a smart environmental investment.

Question 38: Based on the information in paragraph 3, which of the following best describes the main difference between parks and rooftop gardens?

Nhận định nào sau đây là đúng?

Các loại tơ polyamide như tơ enang và tơ capron đều là những hợp chất bền, dai nên được dùng làm vải may mặc tốt, hay làm võng nằm, lưới bắt cá, chỉ khâu, các sợi dây thừng, ... Nếu đem \(101,9(\mathrm{~kg})\) \(varepsilon\)-aminocaproic acid tổng hợp tơ capron thì thu được \(12,6(\mathrm{~kg})\) nước. Hiệu suất phản ứng tổng hợp tơ capron là