Trong 1,0 ns, ánh sáng truyền được quãng đường bao nhiêu mét?

“Ngoài cật có một manh áo vải, nào đợi mang bao tấu, bầu ngòi; trong tay cầm một ngọn tầm vông, chị nài sắm dao tu, nón gõ.

Hỏa mai đánh bằng rơm con cúi, cũng đốt xong nhà dạy đạo kia; gươm đeo dùng bằng lưỡi dao phay, cũng chém rớt đầu quan hai nọ.

Chi nhọc quan quản gióng trống kì trống giục, đạp rào lướt tới, coi giặc cũng như không, nào sợ thằng Tây bắn đạn nhỏ đạn to, xô cửa xông vào, liều mình như chẳng có.

Kẻ đâm ngang, người chém ngược, làm cho mã tà ma ní hồn kinh; bọn hè trước, lũ ó sau, trối kệ tàu sắt tàu đồng súng nổ.”

(Nguyễn Đình Chiểu, Văn tế nghĩa sĩ Cần Giuộc)

Câu nào sau đây nhận xét đúng nhất về nhịp điệu của đoạn trích trên?

Một vật đang nằm yên trên mặt đất, lực hấp dẫn do Trái Đất tác dụng vào vật có độ lớn

Tính chất của cuộc chiến tranh thế giới thứ hai thay đổi được đánh dấu bằng sự kiện nào?

Read the following passage about lifelong learning 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.

[I] Lifelong learning is the ongoing, voluntary, and self-motivated pursuit of knowledge for personal or professional development (Knowles, 2020). [II] This concept emphasizes that learning does not stop after formal education, but rather continues throughout an individual's life, adapting to changing circumstances and needs. [III] In today’s fast-paced world, where technology and job markets evolve rapidly, lifelong learning has become increasingly essential. [IV]

One of the primary benefits of lifelong learning is its ability to enhance employability. Individuals who engage in continuous education are more likely to keep their skills relevant and competitive in the job market. According to a report by the World Economic Forum (2021), over 50% of employees will need reskilling due to technological advancements in the coming years. Lifelong learners are better equipped to adapt to these changes, making them more attractive candidates for employers.

Moreover, lifelong learning contributes to personal fulfillment and mental well-being. Engaging in new learning experiences can stimulate the brain, foster creativity, and improve cognitive function. Research indicates that individuals who pursue learning opportunities throughout their lives tend to report higher levels of happiness and life satisfaction (Smith & Johnson, 2019). Whether it is taking a course, learning a new language, or picking up a new hobby, the process of acquiring knowledge can be enriching and enjoyable.

In addition, lifelong learning promotes social engagement and community involvement. Participating in educational programs or community workshops can foster connections with others who share similar interests. This social aspect of learning can enhance one's sense of belonging and support networks, which are crucial for mental health (Jones, 2022).

Overall, lifelong learning is not just an individual responsibility; it requires support from educational institutions, employers, and communities to create an environment conducive to continuous education. By fostering a culture of learning, society can better prepare individuals for the challenges of the future and ensure that everyone has the opportunity to thrive.

(Adapted from The Importance of Lifelong Learning by Knowles, Smith, Johnson, and others)

Which of the following best paraphrases the underlined sentence in paragraph 4?

Cho hai tập hợp $A=\left\{ 1;2;3;7 \right\}\text{,}\ B=\left\{ 2;4;6;7;8 \right\}$. Mệnh đề nào sau đây đúng?

Read the following passage about Wildlife Conservation in Africa 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.

Wildlife conservation in Africa is vital for preserving biodiversity and ensuring the survival of iconic species such as elephants, lions, and rhinos. [I] The continent is home to some of the world’s most diverse ecosystems, including savannahs, rainforests, and deserts. [II] Conservation efforts involve strategies like protecting habitats, combating poaching, and raising awareness about the importance of wildlife. [III] Despite challenges, success stories demonstrate the positive impact of these efforts. [IV]

One notable example comes from Kenya, where anti-poaching initiatives and community engagement have helped stabilize elephant populations in Amboseli National Park. Similarly, in South Africa, rhino conservation programs use advanced technologies like drones and GPS tracking to monitor and protect vulnerable animals. These efforts not only safeguard wildlife but also promote eco-tourism, which supports local economies.

However, wildlife conservation in Africa faces persistent threats. Habitat loss due to agricultural expansion and urbanization continues to endanger species. Climate change exacerbates these challenges, altering migration patterns and threatening ecosystems. Furthermore, poaching and the illegal wildlife trade remain significant concerns, driven by global demand for products such as ivory and rhino horn.

To overcome these challenges, conservationists emphasize the need for international collaboration and local community involvement. Initiatives like eco-tourism provide financial incentives for communities to protect wildlife. Governments, NGOs, and individuals must work together to ensure the survival of Africa’s unique species for future generations.

Where in paragraph 1 does the following sentence best fit?

"Africa’s wildlife holds both ecological and cultural significance."

Giá trị lớn nhất của \(F(x;y) = x - 3y\), với điều kiện \(\left\{ \begin{array}{l}x \ge 0\\0 \le y \le 5\\x + y - 2 \ge 0\\3x - y \le 6\end{array} \right.\)?

Gọi $\overline{A}$ là giá trị trung bình, $\Delta A'$ là sai số dụng cụ, $\overline{\Delta A}$ là sai số ngẫu nhiên, $\Delta A$ là sai số tuyệt đối. Sai số tỉ đối của phép đo là

Nguyên tố vi lượng trong cơ thể sống không có đặc điểm nào sau đây?

Quan sát hình ảnh sau và cho biết đây là vành bánh xe của phương tiện nào?

Công ty X chuyên sản xuất về bánh bao, trong quá trình tạo ra thành phẩm, nhà sản xuất đã chia các yếu tố như nhân bánh, vỏ bánh và hộp bánh cho các đơn vị sản xuất khác nhau. Trong trường hợp trên, nhà sản xuất đã thực hiện hoạt động gì của kinh tế?

Giao điểm của đồ thị hàm số \(y=-{{x}^{3}}+5x-2\) với trục tung có toạ độ là

Cho đoạn lệnh sau:

x=20

if x%2==0:

x=x+10

else:

x=x-10;

Sau khi thực hiện đoạn chương trình x nhận giá trị bao nhiêu?

Tòa án nhân dân tối cao bao gồm những cơ quan nào dưới đây?

Cho mệnh đề chứa biến chia hết cho 5”. Mệnh đề nào sai?

Trong lĩnh vực quân đội, quốc phòng, Hồ Quý Ly tiến hành cải cách nào sau đây?

Một ô tô đi trên quãng đường AB với v = 54 km/h. Nếu tăng vận tốc thêm 6 km/h thì ô tô đến B sớm hơn dự định 30 phút. Quãng đường AB là:

Chọn ý đúng: Nguyên tắc nào vừa thuộc nhóm các nguyên tắc phát triển bền vững, vừa thuộc nhóm các nguyên tắc tối ưu?

Read the following passage about Asia’s culture and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions

[I] Chemicals are present everywhere in our environment, some of which occur naturally, while others are the result of human activities. [II]. They are found in the air, water, and soil, and can have both positive and negative impacts on the ecosystem. Some chemicals, like nutrients, help support life by promoting plant growth [III]. However, others, especially synthetic chemicals such as pesticides, fertilizers, and industrial waste, can be harmful to both the environment and human health. [IV]

The widespread use of pesticides and fertilizers in agriculture has been a major cause of chemical pollution. When these chemicals are used improperly or excessively, they can wash into rivers, lakes, and oceans, leading to water pollution. This runoff can also contribute to the depletion of oxygen in water bodies, a process known as eutrophication. Eutrophication harms aquatic life, disrupting ecosystems and causing the death of fish and other organisms that rely on oxygen.

Toxic chemicals such as heavy metals (e.g., mercury and lead) pose additional threats to the environment and human health. These substances can accumulate in the food chain, starting from plants and animals in contaminated areas and eventually reaching humans. Long-term exposure to these chemicals can lead to serious health issues, including neurological disorders, cancer, and other chronic conditions. Many countries have established regulations to limit the use of harmful chemicals, but enforcement remains a challenge.

Efforts to reduce chemical pollution involve a combination of government regulations, technological innovations, and public awareness. Governments worldwide have introduced stricter rules on the use of hazardous chemicals and encouraged the development of eco-friendly alternatives. These regulations aim to limit the harmful impact of chemicals on the environment, encouraging industries to adopt safer practices. Environmental organizations play a vital role in monitoring chemical pollution, raising awareness, and advocating for cleaner technologies. They work closely with policymakers to ensure effective enforcement of environmental laws. While progress has been made, ongoing efforts are needed to address emerging challenges and ensure a safer and healthier environment for future generations.

Which of the following best paraphrases the underlined sentence in paragraph III?

"These substances can accumulate in the food chain, starting from plants and animals in contaminated areas and eventually reaching humans."