Nếu chọn ra 1 nam và 1 nữ làm trực nhật từ một tổ gồm 4 nam và 6 nữ thì có bao nhiêu cách?
Đề thi thử Tốt nghiệp THPT môn Toán năm 2023 giúp học sinh đánh giá khả năng tiếp thu và vận dụng kiến thức đã học trong học kỳ, qua các dạng bài tập từ cơ bản đến nâng cao. Đề thi này không chỉ kiểm tra kiến thức mà còn giúp rèn luyện khả năng giải quyết vấn đề nhanh chóng.
Câu hỏi liên quan
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."
Chi tiết Diêm Vương xử kiện nói lên điều gì?
Những dụng cụ nào sau đây trong phòng thí nghiệm Vật lí thuộc loại dễ vỡ?
Choose the word pronounced differently from the rest: student, usually, curly, during
Thiên văn học cung cấp những tri thức cơ bản để các nhà sử học khám phá về
Nội dung nào sau đây thể hiện nhiệm vụ và quyền hạn của Chủ tịch nước Cộng hoà xã hội chủ nghĩa Việt Nam?
Điền vào chỗ trống.
Vào năm 2020, tỷ suất xuất cư của nước ta là 36,4‰, tỷ suất nhập cư là 29,7‰. Tính tỷ lệ gia tăng cơ học của nước ta năm 2020.
(Làm tròn đến số thập phân thứ nhất của %)
Đáp án:............
Nội dung nào sau đây không phải thuế trực thu?
Số đường chéo của thập giác đều là:
Đồ thị độ dịch chuyển – thời gian của một người đang bơi trong một bể bơi dài 50 m. Trong 20 giây cuối cùng, vận tốc của người đó là bao nhiêu?
- Khi nhiệt độ của hệ thay đổi thì động năng của các phân tử cấu tạo nên hệ thay đổi. Do đó, nội năng phụ thuộc vào ...(1)... của hệ. Mặt khác, khi thể tích hệ thay đổi thì khoảng cách giũ̃a các phân tử cấu tạo nên hệ thay đổi, làm cho thế năng tương tác giữa chúng thay đổi. Vì thế, nội năng cũng phụ thuộc vào ...(2)... của hệ. Điền cụm từ thích hợp vào chỗ trống.
Nguyên nhân nào thúc đẩy các quốc gia trên thế giới hình thành liên minh chống phát xít?
Đâu là ý đúng: Có mấy tiêu chí trong đánh giá công nghệ?
Các nhân tố môi trường có ảnh hưởng rõ nhất vào giai đoạn nào trong quá trình phát sinh cá thể người?
Chức năng kiểm sát hoạt động tư pháp của Viện kiểm sát là gì?
Việc phe Hiệp ước không hưởng ứng lời kêu gọi hòa bình của Chính phủ Xô viết đã dẫn đến hệ quả gì:
Read the following passage about Our Festival Traditions 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.
How Green Are Our Festival Traditions?
Festivals are a time of celebration, bringing happiness and joy through various traditions. However, many of these traditions are not environmentally friendly and could harm our planet. To ensure a sustainable future, it is important to reconsider some of these practices and explore more eco-friendly alternatives.
One common festival tradition is the release of balloons and sky lanterns, especially in countries like China, India, and Japan. These beautiful sights are believed to bring good luck and carry wishes to the sky. Unfortunately, the environmental impact is significant. Balloons and lanterns often end up as litter, which is difficult to decompose. The frames of sky lanterns can harm wildlife, and animals often mistake balloons for food, putting them at risk. Furthermore, lanterns have been known to cause wildfires, endangering both nature and human safety.
Another tradition that raises concerns is fireworks. In countries like Australia and the US, fireworks displays are a staple during festivals. While they are visually stunning, fireworks release harmful chemicals into the air, contributing to pollution and poor air quality. Similar to sky lanterns, fireworks can also cause fires, which can be devastating to both the environment and communities.
Lastly, Christmas trees, whether real or artificial, are a central part of holiday decorations in homes and businesses worldwide. Real trees, when discarded, release methane and carbon dioxide, two harmful greenhouse gases that contribute to global warming. Although artificial trees can be reused for several years, their production involves harmful pollutants, and when they end up in landfills, they take centuries to decompose, further burdening the environment.
In conclusion, while festival traditions bring joy and excitement, many of them have negative environmental consequences. By choosing more sustainable practices, we can celebrate in ways that are both enjoyable and environmentally responsible, ensuring that future generations can also enjoy these traditions.
The word staple in paragraph 2 could be best replaced by:
Điều nào là không đúng khi nói về sự phóng thích của virus có màng bọc ra khỏi tế bào vật chủ?
Ngành tài chính - ngân hàng có vai trò nào sau đây?
Read the following passage about urbanisation and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions.
URBANISATION: A GROWING PHENOMENON
Urbanisation is the process through which cities grow, and higher populations begin to inhabit urban areas. This phenomenon has accelerated significantly over the past few decades due to various factors. One of the primary drivers is the search for better employment opportunities. In rural areas, job prospects are often limited to agriculture and small-scale industries, which might not provide sufficient income. Consequently, people migrate to cities seeking better livelihoods and living standards.
Additionally, urban areas offer more advanced educational facilities and healthcare services compared to rural regions. Many families move to cities to provide their children with higher-quality education and greater future opportunities. Access to hospitals and specialized medical services also attracts people to urban centers, especially in countries where rural healthcare is underdeveloped.
However, rapid urbanisation brings about several challenges. Overcrowding in cities can lead to inadequate housing, strained infrastructure, and increased pollution. The expansion of urban areas often results in the loss of green spaces and agricultural land, impacting food production and the environment. Governments and city planners must address these issues to ensure sustainable urban growth.
Despite these challenges, urbanisation has several positive aspects. Cities are often cultural melting pots, where diverse groups of people interact, leading to vibrant communities and innovation. The concentration of resources and talents in urban areas can drive economic growth and technological advancements.
The word This phenomenon in paragraph 1 refers to ____.
