Hệ thống nào sau đây áp dụng cho các loại cây có hình thái thân, lá nhỏ như rau ăn lá?

Các chủ thể tiêu dùng cần phải có trách nhiệm gì khi tham gia vào những hoạt động kinh tế?

Nhận định nào sau đây không đúng với nhân trong Trái Đất?

Read the following passage 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.

SCREEN TIME: MENTAL HEALTH MENACE OR SCAPEGOAT?

    "Have smartphones destroyed a generation?" Jean Twenge - a psychology professor at San Diego State University - asked in her controversial book, iGen. In the book, she argues that those born after 1995 are facing "a mental-health crisis", and she believes it can be linked to growing up with their noses pressed against a screen. Her newest study provides more support for that connection, showing that teens who spent more than an hour or two a day interacting with their gadgets were less happy on average than those who had more face time with others.

    Twenge's conclusions have come up against criticism in the past. Some have accused her work of oversimplifying or overlooking data that may tell a slightly different story. Twenge recognises that her study suggests only a link between screen use and psychological well-being. A possible explanation is that kids are running to their screens to escape from the things in life that are making them unhappy. However, the surveys can't say whether screen time directly changes teens' mental health, the research states.

    Philanthropist Melinda Gates, whose three children were also born after 1995, wrote in The Washington Post, "phones and apps aren't good or bad by themselves, but for adolescents who don't yet have the emotional tools to overcome life's problems, they can aggravate the difficulties of growing up."

    At the same time, she said, kids are learning on their devices and connecting in novel ways. Other studies have explored the connection between social media and isolation and how "likes" activate the brain's reward centre. Some analyses have found that moderate use of these technologies is not harmful in itself and can even improve children's social skills and build emotional strength.

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

Người ta cần làm một khối thuỷ tinh có dạng hình chóp tứ giác đều có diện tích toàn phần bằng \(8{\rm{d}}{{\rm{m}}^2}.\) Cạnh đáy của hình chóp bằng bao nhiêu decimét để thể tích của khối thuỷ tinh lớn nhất (làm tròn kết quả đến hàng phần trăm)?

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word in the following question.

People who defaulted on their homes repossessed if they do not make their mortgage payments.

Cho mạch điện với 2 rơ le K1 và K2. Mạch điện sau đây thực hiện phép toán logic nào?

Nhà nước, xã hội phát triển văn học, nghệ thuật nhằm mục đích gì?

Giá trị lớn nhất của \(F(x;y) = 5x - 3y\), với điều kiện \(\left\{ \begin{array}{l}x \ge 0\\0 \le y \le 5\\x + y - 2 \ge 0\\3x - y \le 6\end{array} \right.\) 

Đơn phân cấu tạo nên nucleic acid có

Biết nguyên tử Na có kí hiệu nguyên tử là \({}_{11}^{23}Na\), vậy tổng số hạt p, n, e trong ion Na⁺ là

Mark the letter A, B, C or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions from 13 to 17.

Dear Jamie,

a. I loved our music class today because we learned about protest songs from different times.

b. Bob Dylan became famous in the 1960s when he wrote songs about war and peace that changed how people thought about important problems.

c. Our teacher wants us to pick one protest song for our project, so can we meet at the library on Saturday to work together?

d. Modern artists now use computers to turn climate data into musical notes, so when pollution levels rise, the music gets higher and louder.

e. Old folk singers used simple guitars and strong words to fight for better working conditions in factories and farms.

Your friend,

LK

Cho ba tập hợp $A = [ -2; 2 ]$; $B = [1;5]$; $C = [ 0;1)$. Khi đó tập $( A \backslash B ) \cap C$ là

Ảnh hưởng xấu của bệnh đến:

Mark the letter A, B, C, or D on your answer sheet to indicate the correct arrangement of the sentences to make a meaningful paragraph/letter in each of the following questions.

a. Also, volunteering helps students connect with the community, making them aware of the needs around them.

b. Additionally, students develop such important skills as teamwork and communication ones while they volunteer.

c. Firstly, students who do voluntary work gain valuable real-world experience which can help in their future careers.

d. Finally, doing volunteer work can be a rewarding experience, as students feel good about helping others.

e. High school students benefit from doing voluntary work in many ways.

Chọn cặp từ/ cụm từ thích hợp nhất điền vào chỗ trống.

Ánh sáng mặt trời cung cấp _____ mà thực vật xanh sử dụng để tạo ra đường chủ yếu dưới dạng tinh bột, quá trình này được gọi là _____.

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

a. I’m short on time, though; I need to get back to work.

b. I know a great place; it's just around the corner.

c. Can you recommend a good café nearby?

d. If you hurry, I can show you the way.

Cho hai mặt phẳng \((P): 2 x-y+2 z-3=0\) và \((Q): x+m y+z-1=0\). Tìm tham số \(m\) để hai mặt phẳng \((P)\) và \((Q)\) vuông góc với nhau.

Nhiệm vụ của các cuộc cách mạng tư sản đều hướng tới hai nhiệm vụ chính nào?

Mục đích quan trọng, xuyên suốt của các nhà nước phong kiến Việt Nam khi tổ chức bộ máy nhà nước là gì?