Trong thí nghiệm nhận biết glucose bằng phép thử Benedict, để đun nóng dung dịch glucose với dung dịch Benedict không nên dùng cách nào sau đây?

Gọi s là diện tích tam giác ABC, để đưa giá trị của s ra màn hình ta viết:

Ampe kế nào dưới đây là phù hợp nhất để đo cường độ dòng điện chạy qua bóng đèn pin (Cho phép dòng điện có cường độ lớn nhất là 0,35A).

Hai đồ thị hàm số $y=x^3+2x^2-x+1$ và $y=x^2-x+3$ có tất cả bao nhiêu điểm chung? 

Đâu là các quá trình ngoại lực?

Triết lý về cách ứng xử của con người với thiên nhiên gợi ra trong bài thơ số 2 của Chiyo là gì?

Read the following passage about Preserving Today's Soundscapes for Future Generations 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 23 to 30.

Sonic time capsules save today's sounds for future people. Scientists capture everyday sounds like streets, birds, and children playing in parks around the world. These recordings help us remember our world before changes. Cities are losing unique sounds as life becomes similar everywhere. Old machines, music, and natural sounds might disappear if not saved. Many important cultural sounds are already lost forever because nobody thought to record them when they still existed.

Sound collectors use microphones to record in different places. They visit forests, oceans, cities, and villages to capture soundscapes throughout different seasons and times of day. They store sounds in digital libraries for years. Museums have rooms for listening to past sounds. These experiences help people understand history in ways books cannot. Some researchers travel to remote locations to record indigenous languages and traditional ceremonies before they vanish from our collective memory.

Climate change is changing world sounds. Melting glaciers, endangered animals, and disappearing languages need saving before they're gone. Researchers believe future people will want to know how our world sounded. These capsules will be important records, like photographs. Scientists study how sounds affect human health. The sounds of nature can reduce stress and improve mental health, which makes preserving natural soundscapes even more important for future generations who may live in highly urbanized environments.

Community projects invite people to record daily sounds. Children learn to listen carefully to the world around them and identify sounds that matter to their community. Old people share recordings from their childhood. People feel emotions when listening to these collections. Artists create music using everyday recordings. These projects help communities protect special sounds for the future. Some cities now have sound preservation policies that protect unique acoustic environments just as they would protect historic buildings or natural landscapes from development.

The word “they” in paragraph 2 refers to _________.

Nhóm cây trồng nào sau đây phân loại theo khả năng hóa gỗ?

Tỉ lệ gia tăng dân số tự nhiên của Hoa Kì có đặc điểm nào?

Ngân hàng Y cho ông P vay 30 tỉ đồng để thành lập công ty sau khi xem xét năng lực tài chính của ông là 2 sổ hồng nhà riêng và 3 giấy phép sở hữu xe ô tô. Ngân hàng đã thể hiện đúng đặc điểm nào dưới đây của tín dụng?

Ở 1 loài thực vật, khi lai 2 dòng thuần chủng đều có hoa trắng thu được F₁ toàn hoa đỏ. Cho F₁ tự thụ phấn, thế hệ F₂ xuất hiện tỉ lệ 9 hoa đỏ : 7 hoa trắng. Có thể kết luận:

Read the passage carefully

1. Millions of people are using cellphones today. In many places, it is actually considered unusual not to use one. In many countries, cellphones are very popular with young people. They find that the phones are more than a means of communication - having a mobile phone shows that they are cool and connected.

2. The explosion in mobile phone use around the world has made some health professionals worried. Some doctors are concerned that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worried about the negative publicity of such ideas. They say that there is no proof that mobile phones are bad for your health.

3. On the other hand, medical studies have shown changes in the brain cells of some people who use mobile phones. Signs of change in the tissues of the brain and head can be detected with modern scanning equipment. In one case, a traveling salesman had to retire at young age because of serious memory loss. He couldn't remember even simple tasks. He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day, every day of his working week, for a couple of years. His family doctor blamed his mobile phone use, but his employer's doctor didn't  agree.

4. What is it that makes mobile phones potentially harmful? The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about.

5. As the discussion about their safety continues, it appears that it's best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a warning label that says they are bad for your health. So for now, it's wise not to use your mobile phone too often.

Choose an option (A, B, C, or D) that best answers each question:

According to the passage, what can be inferred about cellphones?

Với phản ứng đơn giản: aA + bB ⟶ sản phẩm, tốc độ phản ứng được tính theo công thức

Vì sao thực dân Pháp chú trọng xây dựng hệ thống giao thông trong cuộc khai thác thuộc địa lần thứ nhất?

Read the following passage about Artificial Intelligence 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 23 to 30.

Artificial Intelligence (AI) refers to the simulation of human intelligence in machines that are designed to think, learn, and adapt. AI is applied in various fields, including healthcare, education, transportation, and entertainment. Technologies such as machine learning, natural language processing, and robotics enable AI systems to perform tasks like diagnosing diseases, personalizing education, and even driving autonomous vehicles.

One significant benefit of AI is its ability to enhance efficiency and accuracy. For example, AI-powered systems can analyze vast amounts of data faster than humans, identifying patterns and trends that might otherwise go unnoticed. In healthcare, this means earlier diagnosis and improved treatment plans. In transportation, AI contributes to safer roads with the development of self-driving cars.

Despite these advantages, AI poses several challenges. Concerns include ethical issues, such as bias in algorithms, and the potential loss of jobs due to automation. Cybersecurity risks are also heightened as AI systems become more integrated into critical infrastructure. Addressing these challenges requires transparency, regulation, and collaboration among stakeholders.

To maximize its benefits, society must approach AI development responsibly. Governments, private organizations, and researchers are working together to create ethical guidelines and ensure that AI serves humanity’s best interests. As AI continues to evolve, it holds the promise of transforming the way we live and work.

The word “integrated” in paragraph 3 could best be replaced by ______.

Bản kế hoạch thu chi giúp quản lý tiền bạc của cá nhân bao gồm các quyết định về hoạt động tài chính như thu nhập, chi tiêu tiết kiệm, đầu tư, để thực hiện những mục tiêu tài chính của cá nhân được gọi là:

Giá trị của giới hạn \(\mathop {\lim }\limits_{x \to  - \infty } \left( {x - {x^3} + 1} \right)\) là

Sai số tuyệt đối của thời gian là:

Nguyên nhân chính phía Đông của Liên Bang Nga không thuận lợi cho phát triển nông nghiệp?