Viết mệnh đề sau bằng kí hiệu \(\forall \) hoặc \(\exists \): “Có một số nguyên bằng bình phương của chính nó”?

Có bao nhiêu số tự nhiên chã̃n có ba chữ số?

Những loài động vật sinh trưởng và phát triển qua biến thái hoàn toàn?

Read the following passage about the The Importance of Social Media in Modern Society 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.

In the 21st century, social media has become a crucial element of everyday life[I]. Platforms such as Facebook, Twitter, Instagram, and TikTok link individuals around the world, [IV]. Although some may critique social media for promoting negativity, it is important to acknowledge its numerous positive effects on society[III]. This essay will delve into the importance of social media, its influence on shaping public perception, and the challenges it poses.[II]

One of the primary benefits of social media is its ability to foster communication and connection. People can maintain relationships with friends and family, regardless of geographical barriers. This aspect is particularly vital for those who live far away from loved ones. For example, a student studying abroad can easily share their experiences with family through posts, photos, and video calls. Furthermore, social media enables individuals to connect with like-minded people and build communities around shared interests or causes. Activist groups, for instance, often use social media platforms to rally support for important issues, raising awareness and mobilizing action more efficiently than traditional methods.

Moreover, social media serves as a powerful tool for information dissemination. News spreads rapidly through these platforms, allowing individuals to stay informed about current events. During emergencies, such as natural disasters, social media can provide crucial information in real time, helping people stay safe and informed. However, this rapid dissemination of information also raises concerns about the accuracy and reliability of the content being shared. Misinformation can spread just as quickly as legitimate news, leading to confusion and mistrust.

Despite the challenges posed by misinformation, social media plays a significant role in shaping public opinion. People often turn to these platforms to voice their opinions and engage in discussions on various topics. For instance, political debates and social movements frequently gain traction through social media, allowing individuals to express their views and influence others. This democratization of discourse can empower marginalized voices and facilitate social change. However, it is crucial to approach online discussions critically, as echo chambers can form, reinforcing existing beliefs rather than encouraging open dialogue.

In conclusion, while social media presents challenges such as misinformation and polarized discussions, its positive contributions to communication, information dissemination, and social activism cannot be overlooked. As society continues to evolve, it is essential to harness the potential of social media while being mindful of its pitfalls. By promoting responsible use and critical thinking, we can maximize the benefits of social media and foster a more connected and informed society.

Which of the following is TRUE according to the passage?

Cho hai quá trình sau:

NH₄NO_3(s)  N₂O_(g)  +  2H₂O_(g)         = -36 KJ

NH₄Cl_(s)      NH_3(g)  +  HCl_(g)         = 176 KJ

Trong cùng điều kiện môi trường (nhiệt độ cao hoặc có tia lửa), phát biểu nào sau đây là đúng?

Cho hai tập hợp $A=\left[ -2;7 \right), \, B=\left(1;9 \right]$. Tập $A\cup B$ là

Hoạt động sản xuất có tác động như thế nào đến các hoạt động phân phối – trao đổi, tiêu dùng?

Read the following passage about powering 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. 

TikTok is a popular social media app where people can create and share short videos [I]. It started in China in 2016 as Douyin [II]. The app is known for its easy-to-use tools that let users add music, effects, and filters to their videos [III]. People of all ages enjoy making and watching TikTok videos, which can be funny, educational, or creative [IV].

One of the reasons TikTok is so popular is because of its algorithm, which shows users videos that match their interests. When you open the app, you see a personalized feed called the "For You" page. This page is different for everyone and updates with new videos all the time. Users can also follow their favorite creators to see more of their content.

TikTok has become a platform for trends and challenges. Many users participate in dance challenges, lip-syncing, and other viral activities. These trends can spread quickly, reaching millions of people in a short time. Because of this, TikTok has influenced music charts, fashion, and even language. Songs that go viral on TikTok often become hits on other platforms too.

The app is also a space for education and advocacy. Many creators use TikTok to share knowledge about various topics, such as science, history, cooking, and fitness. Others use the platform to raise awareness about social issues and promote positive change.

In addition to individual creators, many brands and businesses use TikTok for marketing. They create content to engage with their audience, often using popular trends and challenges to promote their products.

However, TikTok has faced some criticism and challenges. Concerns about privacy and data security have led to scrutiny from governments. Despite these issues, TikTok still remains one of the most downloaded apps in the world.

The word their in paragraph 2 refers to ______.

Một âm thoa nhỏ đặt trên miệng của một ống không khí hình trụ AB, chiều dài l của ống khí có thể thay đổi được nhờ dịch chuyển mực nước ở đầu B. Khi âm thoa dao động ta thấy trong ống có một sóng dừng ổn định. Khi chiều dài ống thích hợp ngắn nhất 13cm thì âm thanh nghe to nhất. Biết rằng với ống khí này đầu B là một nút sóng, đầu A là một bụng sóng. Khi dịch chuyển mực nước ở đầu B để chiều dài 65cm thì ta lại thấy âm thanh cũng nghe rất rõ. Tính số nút sóng trong ống.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

When parents name their children, they often take into consideration their own preferences, family traditions, or beliefs. In many European cultures, parents typically select names based on family connections, often honoring grandparents or ancestors. For instance, in Italy, children are commonly named after their grandparents, starting with the father's parents and then the mother's. Similarly, in Eastern Europe, children may be named after their deceased relatives to protect them from harm.

In some Asian countries, the naming process may involve the child's grandfather or a fortune-teller, who chooses a name believed to shape the child's character. Names might be inspired by elements like fire, water, earth, wood, or metal, or they may convey qualities such as beauty, strength, or kindness.

African cultures also have unique naming traditions, such as in Ghana's Akan culture, where a child's name is determined by the day of their birth. Each day has specific names for boys and girls, reflecting characteristics associated with that day. For example, a boy born on Friday might be named Kofi, symbolizing a "wanderer" or "explorer" while a girl born on the same day could be named Afua, also representing a traveler.

No matter where a name originates, it holds significant meaning and reflects the child's cultural heritage. Whether chosen out of preference or dictated by tradition, a child's name is a cherished and respected gift.

According to the reading passage, which would probably NOT be found in the meaning of children's name across the world?

Dialogue arrangement: Choose A, B, C or D to make a complete dialogue for each question. 

a. Why is that?

b. It looks like it may rain soon.

c. I really love how rain clears the air.

d. Yes, and I hope that it does.

Xác định: Nhân tố nào là cơ sở hình thành các điểm du lịch và sự đa dạng của sản phẩm du lịch?

Sự kiện nào đánh dấu thực dân Pháp hoàn thành cơ bản cuộc xâm lược Việt Nam? 

Read the passage carefully

1. Do you find yourself yawning all day at school? You probably need more sleep. However, it is not just how much sleep you get that is important. What you do before bedtime also has a huge effect on how you feel the next day. If you spend time chatting to someone on social media, or reading a book on your e- reader, you are not alone.

2. All devices' screens give out a large amount of blue light, which affects the body's production of the sleep hormone, melatonin, which can change your sleep patterns. So it is not just getting to sleep that becomes hard, but the quality of your sleep also suffers. The result is that you can wake up several times during the night, and have difficulty getting up in the morning.

3. Sleep is food for the brain, so not sleeping well can be a severe problem for anyone, especially for teenagers, because their brains are still developing. When you do not sleep well, it can be difficult to concentrate at school, which makes it harder to learn and get good grades. It can also affect your mood, making you feel sad or anxious. 

4. So, it is clear you should not use your phone before you go to sleep. Why not leave it in another room? Nothing on social media is so important that it cannot wait a few hours! You should rediscover paper books and enjoy feeling tired and sleepy before bedtime rather than wondering why your best friend has not liked your photo! How will you wake up? You do not have to use the alarm on your phone. Go and buy yourself an old-fashioned alarm clock! The negative effects that screen time is having on sleep have been in the news a lot recently, so manufacturers of smartphones and tablets have added a feature to the mobile devices that can help reduce these. Most new phones have a night-time setting that changes the colour of the screen so that it gives out less blue light. If you really cannot avoid going onto social media at bedtime, think about turning on this setting on your phone.

(Adapted from Prepare)

Which of the following is NOT TRUE according to the passage? 

Điểm \(A(2;3)\) thuộc miền nghiệm của hệ bpt nào?

Phương án nào sau đây giải thích đúng nhất vai trò của thiết bị thông minh đối với xã hội trong cuộc cách mạng công nghiệp lần thứ tư?

Tập xác định của hàm số \(y = \sqrt {4 - x} + \sqrt {x - 2} \) là?

Nhiệm vụ của Chính phủ là gì?

Cho mệnh đề: “Nếu tam giác có hai góc bằng \({60^ \circ }\) thì tam giác đó là tam giác đều”. Mệnh đề đảo của mệnh đề trên là?

Cho hình chóp \(S.ABCD\) có đáy \(ABCD\)là hình bình hành. Gọi \(d\) là giao tuyến của hai mặt phẳng \(\left( SAD \right)\And \left( SBC \right)\). Khẳng định nào sau đây đúng?