Sóng dọc truyền được trong các môi trường

Văn bản nghị luận một vấn đề xã hội giúp người đọc

Điều kiện xác định của phương trình \(\sqrt{4-2 x}=\frac{x+1}{x^{3}-3 x+2}\) là

Read the following passage about the impact of social media on mental health 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] In recent years, social media platforms have become a central part of daily life, offering users countless ways to connect, share, and communicate. [II] While these platforms offer many advantages, experts have noted rising concerns about their effects on mental health, particularly among young people (Smith & Anderson, 2018). [III] Studies reveal that excessive social media use can contribute to feelings of anxiety, depression, and loneliness, despite its intention to promote connection and social interaction (Twenge & Campbell, 2019). [IV]

A primary reason for these mental health concerns is the tendency for social media users to compare themselves to others. Platforms like Instagram and Facebook often highlight idealized lifestyles, leading users to feel inadequate about their own lives. Additionally, the constant notifications and messages contribute to a "fear of missing out," or FOMO, which keeps individuals in a cycle of checking their phones, often reducing the quality of sleep and overall well-being.

There is also a growing body of research suggesting a link between social media use and decreased attention spans. When users frequently switch between apps and notifications, their ability to focus for extended periods may diminish (Rosen, 2019). This shift in attention can interfere with productivity, especially in academic and professional settings, where sustained focus is essential.

Addressing these challenges requires a multi-faceted approach. Some mental health professionals suggest limiting screen time and setting boundaries, such as "device-free" hours before bedtime. Others recommend engaging in offline activities, like reading or exercising, to reduce dependence on social media and build healthier habits. According to psychologists, such strategies can bu mental resilience and allow for more meaningful, balanced relationships (Robinson & Smith, 2020).

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

Đâu là động lực phát triển nền kinh tế của Hoa Kì?

Cho lăng trụ đứng \(A B C \cdot A^{\prime} B^{\prime} C^{\prime}\) có đáy ABC là tam giác đều cạnh \(a\). Gọi \(D\) là trung điểm cạnh BC . Biết \(A A^{\prime}=2 a\(, khoảng cách giữa hai đường thẳng \(A^{\prime} B\) và \(C^{\prime} D\) là:

Một vật dao động điều hòa với phương trình $x=10\cos4\pi\left(\dfrac{t}{2}-\dfrac{1}{16}\right)$ ($x$ tính bằng cm, $t$ tính bằng s). Tần số dao động của vật là

Cơ cấu dân số hoạt động theo khu vực kinh tế có sự thay đổi theo hướng nào?

Điều nào sau đây là sai? Thế năng trọng trường phụ thuộc vào

Hệ thống xã hội chủ nghĩa trên thế giới được hình thành gắn liền với sự kiện nào sau đây?

Her speech was _________ to all students in the hall yesterday.

Động lực của các cuộc cách mạng tư sản bao gồm

Trồng cà chua áp dụng cho loại mô hình nào sau đây?

Tìm tập xác định của hàm số \(y = \frac{{x + 2}}{{\sqrt {{x^2} - 9} }}\)?

Read the following passage about Life in The Future 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 near future, technology is expected to bring about significant changes to how we lead our lives. One of the most notable shifts will be the way we keep up with the rapid pace of technological advancements. With smart homes and autonomous vehicles, our daily routines will increasingly depend on sophisticated systems designed to make our lives easier. For example, smart assistants will look out for our needs, such as ordering groceries, adjusting room temperatures, or even scheduling doctor’s appointments.

Another major development will be in communication. Today, we already use video calls to stay in touch with friends and family across the globe, but the future promises even more immersive experiences. Virtual reality could allow us to hang out with people in virtual spaces, regardless of where they physically are. As a result, geographical barriers will become less relevant, creating a more connected and global society.

Healthcare is also likely to transform. Advances in artificial intelligence will enable doctors to look after patients more efficiently, diagnosing diseases earlier and prescribing personalized treatments. These changes may extend our lifespan and improve our quality of life. Additionally, breakthroughs in renewable energy will play a key role in sustaining our future. With green energy sources, such as solar and wind power, we can cut down on harmful emissions and move toward a more sustainable planet.

While these advancements sound exciting, they also bring challenges. As technology becomes more integrated into our lives, we must be careful to ensure privacy and security. We need to watch out for potential risks, like data breaches and the misuse of personal information. With thoughtful planning, however, the future holds great promise for improving the way we live, work, and interact with the world.

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

Đại lượng nào dưới đây phải đo bằng phép đo gián tiếp?

Hoạt động đối ngoại của Đảng Cộng sản Đông Dương trong giai đoạn 1930-1940 là

Nhà Ông Năm là chủ một trang trại có 10000 con gà. Phương thức chăn nuôi của ông Năm đó là?

Read of the following leaflet and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 7 to 12.

Colors of Humanity: Experience the World in One Place

Join our amazing cultural festival!

One culture might showcase exuberant, saturated colors in its artistic traditions, while (7)_________ artistic traditions cultivate an appreciation for more restrained, gentle chromatic expressions. Our festival (8)_________ cultures from around the world.

The (9)_________ on children's faces makes our event special. (10)_________ language differences, people connect through art.

The beauty of traditional (11)_________ attracts many visitors. A (12)_________ of food from different countries will be available to try.

Festival Details:

Date: June 15-17, 2025

Location: City Park

Free entry for children

Food and craft markets

Music and dance shows every hour

Contact: worldcolors@example.com | 555-0123

Khi động cơ chưa làm việc, bộ phận nào cung cấp điện cho các thiết bị tiêu thụ điện trên ô tô?