Cho hai tập hợp \(X = \left\{ {1;2;3;4} \right\},Y = \left\{ {1;2} \right\}\). \({C_X}Y\) là tập hợp nào sau đây?

Tôi mồ côi cha năm hai tuổi

Mẹ tôi thương con không lấy chồng

Trồng dâu, nuôi tằm, dệt vải

Nuôi tôi đến ngày lớn khôn.

Hai mươi năm qua tôi vẫn nhớ

Ngày ấy tôi mới lên năm

Có lần tôi nói dối mẹ

Hôm sau tưởng phải ăn đòn.

Nhưng không, mẹ tôi chỉ buồn

Ôm tôi hôn lên mái tóc

- Con ơi

trước khi nhắm mắt

Cha con dặn con suốt đời

Phải làm một người chân thật…

                   (Trích Lời mẹ dặn – Phùng Quán)

Hai câu thơ “Tôi mồ côi cha năm hai tuổi/ Mẹ tôi thương con không lấy chồng” gợi liên tưởng tới quan niệm gì trong đời sống?

Các bậc cấu trúc nào của protein bị thay đổi khi liên kết hydrogen bị phá huỷ?

Vì sao nước Mĩ không bị Chiến tranh thế giới thứ hai tàn phá?

Ở loài ngô, bộ nhiễm sắc thể lưỡng bội là 2n = 20. Theo lý thuyết, số lượng nhiễm sắc thể có trong mỗi tế bào ở kì sau của quá trình nguyên phân là?

Read the following passage about green living 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

          Green living refers to a lifestyle that promotes sustainability and environmental consciousness. This way of life encourages individuals to make choices that reduce their carbon footprint and conserve natural resources. Practices such as recycling, using renewable energy sources, and reducing waste are fundamental aspects of green living. By adopting these practices, individuals can contribute to the preservation of the environment and promote a healthier planet for future generations.

          One significant component of green living is the use of renewable energy sources. Solar, wind, and hydroelectric power are examples of renewable energy that can replace fossil fuels. Using renewable energy reduces greenhouse gas emissions and dependence on non-renewable resources. Additionally, renewable energy sources are often more sustainable and have less impact on the environment.

          Another important aspect of green living is sustainable consumption. This involves choosing products that are environmentally friendly and responsibly sourced. For example, buying locally produced food reduces the carbon footprint associated with transportation. Moreover, opting for products made from recycled materials helps conserve resources and reduce waste.

          Green living also emphasizes the importance of conserving water and energy. Simple actions such as turning off lights when not in use, fixing leaks, and using energy-efficient appliances can significantly reduce energy and water consumption. These practices not only benefit the environment but also save money on utility bills.

          Education and awareness play a crucial role in promoting green living. By educating individuals about the benefits of sustainable practices and how to implement them, communities can foster a culture of environmental responsibility. Awareness campaigns, workshops, and educational programs are effective ways to encourage people to adopt green living practices.

The word "renewable" in paragraph 2 is closest in meaning to:

Hành vi sau đây khiến thông tin cá nhân dễ bị đánh cắp khi tham gia mạng xã hội?

Chu kỳ dao động nhỏ của con lắc đơn phụ thuộc vào:

Chọn ý đúng: Đất trồng nào không tốt cho cây trồng?

Mọi công dân đối với Hiến pháp phải như thế nào?

Gió Tây ôn đới thổi từ áp cao nào sau đây?

Cho nguyên tố X có số hiệu nguyên tử là 18, vị trí của nguyên tố trong bảng tuần hoàn các nguyên tố hoá học là

Read the passage carefully. Choose an option (A, B, C or D) that best answers each question from 23 to 30.

1. How do children learn about wildlife? And is what they learn the sort of thing they should be learning? It is my belief that children should not just be acquiring knowledge of animals but also developing attitudes and feelings towards them based on exposure to the real lives of animals in their natural habitats. But is this happening?

2. Some research in this area indicates that it is not. Learning about animals in school is often completely disconnected from the real lives of real animals, with the result that children often end up with little or no understanding or lasting knowledge of them. They learn factual information about animals, aimed at enabling them to identify them and have various abstract ideas about them, but that is the extent of their learning. Children's storybooks tend to personify animals as characters rather than teach about them.

3. For direct contact with wild and international animals, the only opportunity most children have is visiting a zoo. The educational benefit of this for children is often given as the main reason for doing it but research has shown that zoo visits seldom add to children's knowledge of animals – the animals are simply like exhibits in a museum that the children look at without engaging with them as living creatures. Children who belong to wildlife or environmental organizations or who watch wildlife TV programmes, however, show significantly higher knowledge than any other group of children studied in research. The studies show that if children learn about animals in their natural habitats, particularly through wildlife-based activities, they know more about them than they do as a result of visiting zoos or learning about them in the classroom.

4. Research has also been done into the attitudes of children towards animals. It shows that in general terms, children form strong attachments to individual animals, usually their pets, but do not have strong feelings for animals in general. This attitude is the norm regardless of the amount or kind of learning about animals they have at school. However, those children who watch television wildlife programs show an interest in and affection for wildlife in its natural environment, and their regard for animals in general is higher.

What opinion does the writer express in the second paragraph?

Read the following passage about human life expectancy 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.

In the UK, comprising England, Scotland, Wales, and Northern Ireland, jokes and tricks can be played until noon on 1 April. After midday it's considered bad luck to play a trick. Anyone who forgets this and tries a joke in the afternoon becomes an 'April Fool' themselves.

So, what kind of jokes do people play? Well, a simple example would be telling your friend that their shoelaces are undone. Then, when they bend down to do them up, you shout, 'April Fool!', and they realise their shoelaces are fine.

Maybe it's not your kind of humour, but watch out, there's always someone who will find it funny! In Ireland, a popular prank is to send someone on a 'fool's errand'. The victim is sent to deliver a letter, supposedly asking for help. When the person receives the letter, they open it, read it and tell the poor messenger that they will have to take the letter to another person. This continues and the victim ends up taking the message to several different people until someone feels sorry for them and shows them what the letter says: 'Send the fool to someone else.'

In France, Belgium, the Netherlands (or Holland), Italy and French-speaking areas of Canada and Switzerland, the 1 April tradition is known as the “April Fish”. A common joke is to try to stick a paper fish onto a victim's back without being noticed.

Which country is NOT mentioned in the text?

Cho mẫu số liệu điểm môn Toán của một nhóm học sinh như sau:

\begin{array}{c|c|c|c|c|} \text {Điểm} & {[6 ; 7)} & {[7 ; 8)} & {[8 ; 9)} & {[9 ; 10]} \\ \hline \text {Số học sinh} & 8 & 7 & 10 & 5  \end{array}

Nội dung nào sau đây phản ánh đúng quy trình thu thập và xử lí thông tin sử liệu trong quá trình nghiên cứu, tìm hiểu lịch sử?

Vì sao xe ô tô vẫn phải nộp thuế để bảo vệ môi trường?

Hai vật được thả rơi tự do đồng thời từ hai độ cao khác nhau h₁ và h₂. Khoảng thời gian rơi của vật thứ nhất bằng một nửa khoảng thời gian rơi của vật thứ hai. Bỏ qua lực cản của không khí. Tỉ số các độ cao $\dfrac{h_1}{h_2}$ bằng