Cho tập hợp $X = \{1;5\}$, $Y = \{1;3;5\}$. Tập $X \cap Y$ là 

Đâu là trang web học liệu mỡ?

Cho các chất sau: CH₃NH₂, CH₃NHCH₃, (CH₃)₃N, CH₃CH₂NH₂. Số chất thuộc loại amin bậc I?

a. Arjun: I think they're things farmers use to kill bugs on their plants.

b. Arjun: And they can get into the water and make it dirty for us to drink.

c. Luca: So they're not good for the environment or for people.

d. Luca: Do you know what pesticides are?

e. Luca: That's right. My mum said they can also hurt the soil.

Trong không gian với hệ tọa độ \(Oxyz\) cho mặt phẳng \(\left( P \right):2x+y+2z-1=0\) và đường thẳng \(d:\frac{x-1}{1}=\frac{y+2}{-2}=\frac{z-2}{-2}\).

Gọi \(\alpha \) là góc giữa đường thẳng \(d\) và mặt phẳng \(\left( P \right)\).

Read the following passage about the future of energy 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] As the world grapples with the finite nature of fossil fuel reserves and the detrimental impact of climate change, the future of energy undeniably lies in renewable sources. [II] Scientists and engineers are making substantial advancements in the development of technologies that more efficiently harness solar, wind, hydro, and geothermal energy. [III] Although the transition to these renewable sources presents significant challenges, it is also regarded as a pivotal step towards establishing a sustainable and resilient energy system. [IV]

     One of the most promising advancements in renewable energy is the enhancement of solar panel efficiency. Progress in photovoltaic technology has led to the creation of panels that convert a higher proportion of sunlight into electricity. Likewise, wind turbines are becoming more and more efficient. They are capable of generating power even under low-wind conditions. These innovations are essential for making renewable energy more feasible and accessible to a broader population.

     However, the transition to renewable energy is fraught with obstacles. The intermittent nature of sources like solar and wind necessitates reliable storage solutions to ensure a consistent power supply. Although battery technology has seen significant improvements, further advancements are imperative to meet growing demand. Moreover, new infrastructure for distributing renewable energy requires expansion and upgrading to accommodate these new power sources.

     The economic impact of transitioning to renewable energy is another critical consideration. While the initial investment in renewable energy infrastructure can be substantial, the long-term benefits include reduced energy costs and job creation in the green energy sector. Governments and private enterprises are increasingly acknowledging the necessity of investing in renewable energy projects, which is crucial for fostering innovation and diminishing reliance on fossil fuels.

     Ultimately, the future of energy hinges on our capacity to innovate and adapt. By continuing to invest in research and development, improving infrastructure, and addressing economic and technical challenges, we can transition towards a more sustainable and environmentally friendly energy system.

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

Read the following passage about Traveling 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.

          Traveling and exploring new places is an exciting way to experience different cultures and expand one’s horizons. Whether it’s a short trip to a neighbouring town or a long journey to a foreign country, stepping out into the world offers numerous benefits. It allows individuals to gain new perspectives, meet diverse people, and create lasting memories. Additionally, traveling can enhance personal growth and provide a sense of adventure and fulfillment.

          One of the key advantages of traveling is the opportunity to learn about different cultures. By immersing oneself in a new environment, travellers can gain a deeper understanding of local customs, traditions, and lifestyles. This cultural exchange fosters mutual respect and appreciation among people from different backgrounds. Moreover, experiencing different cultures can challenge preconceptions and broaden one’s worldview.

          Traveling also promotes personal development. Facing unfamiliar situations and overcoming challenges can boost confidence and adaptability. Travelers often find themselves  navigating new cities, trying unfamiliar foods, and communicating in foreign languages. These experiences can enhance problem-solving skills and resilience. Furthermore, the sense of accomplishment from successfully managing a trip can lead to increased self-esteem and a greater sense of independence.

          Another benefit of traveling is the chance to disconnect from the routine of everyday life. Exploring new places provides a break from the usual responsibilities and stresses. This can be refreshing and rejuvenating, allowing individuals to return home with a renewed sense of energy and perspective. Travel can also foster creativity by exposing individuals to new sights, sounds, and ideas.

          Despite its benefits, traveling can also present challenges. Planning a trip requires time and effort, and unexpected situations can arise. However, these challenges can be viewed as opportunities for growth and learning. With careful planning and a positive mindset, the rewards of traveling far outweigh the difficulties.

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

Loài người tiến vào thời kì văn minh khi:

Read the following passage about food addiction 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.

Few people would disagree that one of the world's most popular dishes is pizza. Twenty-two-year-old Zack certainly wouldn't. He would eat a variety of pizza-based items, including homemade pizza, precooked microwave pizza, and even pizza leftovers from the night before. He was consuming 800kg of pizza a year. As a child, Zack had eaten a wide variety of food. But he became addicted to pizza when he started secondary school. American school meals have often been criticised for the large amount of fast food present on the menu, and pizza is the star dish. Zack even spent all his pocket money on slices of pizza.

Naturally, Zack's family worried about his high-calorie, low-vitamin diet. So did Zack. In an attempt to break his addiction, Zack agreed to appear on a TV programme called Freaky Eaters. Its aim was to encourage food addicts to beat their addictions with the help of a psychologist and nutritionist. It wasn't easy. He had to eat a fish dish, while his brother sat in front of him enjoying... a pizza! However, Zack met the challenge and has never eaten pizza again.

Seventeen-year-old Stacy Irvine's friends visit her and discover that she has been rewarded thousands of free toys from fast food restaurants as a regular customer. Stacy's mother often gave her two-year-old girl a portion of fried chicken in a McDonald's restaurant. [I] Since then, Stacy has refused to eat anything else except for pieces of fried chicken, and as a result, her diet has created serious health. She has been warned that if she doesn't change her diet, she will die. [II] Stacy once collapsed due to lack of vitamins and nutrients and needed to be hospitalised. [III] She insisted that Stacy adopt a healthier lifestyle. However, worryingly, Stacy's mother said that while Stacy was beginning to understand the seriousness of her situation, she couldn't eat anything else but chicken nuggets. [IV]

Twenty-year-old Hanna Little was keen on chips. The only thing that Hanna consumed for fifteen years was one plate of chips after another. Not surprisingly, a diet that contained few nutrients and an excess of fat and carbohydrates could only have negative consequences. And it did because not only did Hanna develop health problems, but she also had to leave her job after collapsing at work. At five, Hanna became addicted to chips and refused to eat fruits and vegetables despite her mother's efforts. Hanna says that she was terrified of tasting the flavour of different types of food and she would feel anxious just at the idea of doing it. Parties, picnics and barbecues with friends and family used to be a nightmare. Furthermore, Hanna was soon seen as 'odd' by her friends' parents.

It wasn't until the age of sixteen that Hanna realised she had Selective Eating Disorder (SED). Despite this new knowledge, no solution was found. It wasn't until she lost her job before she started eating normally. Hanna sought therapy from psychologist Felix Economakis, who used hypnosis, a treatment that none of the doctors that she had seen before had mentioned, to get her to eat fruit after one one-hour session, and since then she has been willing to eat anything.... including chips!

(Adapted from Friends Global)

Which of the following is TRUE according to the passage?

Địa hình miền Tây Trung Quốc có đặc điểm nào dưới đây?

Năng lượng có thể được dự trữ và chuyển từ dạng này sang dạng khác, từ vật này sang vật khác khi có lực tác dụng hoặc các tác động vật lí khác.

Thị trường thừa nhận công dụng xã hội của hàng hoá và lao động đã hao phí để sản xuất ra nó, thông qua việc hàng hoá có bán được hay không và bán với giá như thế nào là nội dung thể hiện chức năng nào của thị trường?

Loại tài nguyên nào sau đây thuộc nhóm tài nguyên thiên nhiên vô hạn?

Cần \(\mathrm{m}(\mathrm{g})\) glucose để điều chế \(\mathrm{a}(\mathrm{ml})\) ethyl alcohol \(45^{\circ}(\mathrm{D}=0,8 \mathrm{g} / \mathrm{ml})\), biết hiệu suất của phản ứng điều chế là \(75 \%\). Lượng khí \(\mathrm{CO}_{2}\) sinh ra hấp thụ hoàn toàn vào 1 lít dung dịch \(\mathrm{Ca}(\mathrm{OH})_{2} 1 \mathrm{M}\) thu được 60 gam kết tủa. Giá trị của m và a lần lượt là

Tiêu chí để phân biệt các kiểu dinh dưỡng ở vi sinh vật là gì?

Một điện tích điểm q = 5.10^-7 C đặt tại điểm M trong điện trường, chịu tác dụng của lực điện trường có độ lớn 6.10^-2 N. Cường độ điện trường tại M là:

Thực dân Anh đã không thực hiện chính sách gì để kìm hãm sự phát triển kinh tế của 13 thuộc địa ở Bắc Mĩ?

Từ bầy người nguyên thủy đến xã hội có giai cấp, loài người phải trải qua các chế độ xã hội nào?