Hệ thống các quan hệ kinh tế mang tính tự điều chỉnh tuân theo yêu cầu của các quy luật kinh tế như quy luật cạnh tranh, cung cầu, giá cả, lợi nhuận chi phối hoạt động của các chủ thể kinh tế là

Một cách đảm bảo tính an toàn khi mở một ổ đĩa ngoài là

"Tất cả các dân tộc sinh sống trên lãnh thổ Việt Nam đều có quyền tham gia quản lý nhà nước và xã hội". Đó là biểu hiện của quyền bình đẳng giữa các dân tộc trên phương diện nào?

Đâu là ý đúng: Tiêu chí thứ hai trong đánh giá công nghệ là gì?

Cho \(A = ( - 2;5]\) & \(B = (m; + \infty )\). Tìm \(m \in \mathbb{Z}\) để \(A \cap B\) chứa đúng 5 số nguyên là?

Sơ đồ tóm tắt nào sau đây được nhận xét thể hiện đúng quá trình đường phân?

Read the passage carefully

1. Millions of people are using cellphones today. In many places, it is actually considered unusual not to use one. In many countries, cellphones are very popular with young people. They find that the phones are more than a means of communication - having a mobile phone shows that they are cool and connected.

2. The explosion in mobile phone use around the world has made some health professionals worried. Some doctors are concerned that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worried about the negative publicity of such ideas. They say that there is no proof that mobile phones are bad for your health.

3. On the other hand, medical studies have shown changes in the brain cells of some people who use mobile phones. Signs of change in the tissues of the brain and head can be detected with modern scanning equipment. In one case, a traveling salesman had to retire at young age because of serious memory loss. He couldn't remember even simple tasks. He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day, every day of his working week, for a couple of years. His family doctor blamed his mobile phone use, but his employer's doctor didn't  agree.

4. What is it that makes mobile phones potentially harmful? The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about.

5. As the discussion about their safety continues, it appears that it's best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a warning label that says they are bad for your health. So for now, it's wise not to use your mobile phone too often.

Choose an option (A, B, C, or D) that best answers each question:

What is the word “potentially” in paragraph 4 closet in meaning to?

Phương pháp nào dùng để biểu hiện các đối tượng địa lí di chuyển trong không gian?

Mỗi công dân cần làm gì để thực hiện nghĩa vụ tuân thủ Hiến pháp?

Trong một khu rừng, người ta ước tính đang có 800 con hà mã, 1500 con cá sấu và 2100 con ngựa vằn. Tốc độ tăng trưởng của hà mã là \(4 \%\) mỗi năm, trong khi đó số ngựa vằn lại giảm \(3 \%\) mỗi năm. Số lượng cá sấu tăng \(2 \%\) mỗi năm.

Sau bao nhiêu năm số lượng cá sấu nhiều hơn số lượng ngựa vằn?

Theo quy định pháp luật, công dân có thể thực hiện quyền khiếu nại của mình khi nhận:

Cơ chế thị trường tồn tại những nhược điểm nào sau đây?

Read the following passage about managing change 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. 

Growing up in Athens, Greece, Lydia Borsi remembers feeling tested when she tried to deal with mental health issues. Borsi says she had been seeing a therapist for anxiety. But she notes that people in Greece do not openly discuss mental health issues, which also get little attention in general healthcare services. “It was a lot more secretive. And people thought that I was a lot more unique,” Borsi said.

That all changed in 2017 when she moved to the United States to study at the University of Rochester in Rochester, New York. “When I came here, I really liked that people were not afraid to speak up about mental health and say that it’s important,” she said. The university was very supportive of her needs and offered plenty of information. She also became involved with a school group called Active Minds that helps students deal with mental health issues. [A]

Then due to the spread of the novel coronavirus, the University of Rochester had to move all its classes and some of its mental health resources online. Luckily, Borsi was able to connect with a mental health expert outside the school, in the local community. [B]

But as many of her American friends returned home, Borsi was stuck. Greece had succeeded in limiting the spread of the virus within its borders, but flights there from the U.S. are barred until July. Also, the health crisis has put her plans to seek admission to medical school in Britain on hold. [C] And she is not alone.

[D] In April, Active Minds launched a survey of over 2,000 students at U.S. colleges and universities. The study found that over 80 percent of those asked said the coronavirus crisis had negatively affected their mental health. One in five said it has affected them severely.

Laura Horne, chief program officer at Active Minds, says the findings are especially troubling given that the crisis is only going to make it harder for colleges and universities to help these students. “Colleges and universities had to pivot rather quickly to respond to COVID-19 and figure out all facets of university life, including mental health services. Now they have to figure out how to communicate with students,” Horne said.

Frank Chen is a Houston, Texas-based psychiatrist who has worked with college-age young adults. He points out that individuals at that age are in an important stage of their mental development. And college can be a difficult experience for students with or without mental health issues, as they balance work, studies, and personal relationships. Adding a major world event, like the spread of the coronavirus, makes it very difficult to predict what the long-term psychological effects might be. “I don’t think that there’s another event in the history of the people who are alive now that can really measure up to this,” said Chen.

Why did the writer start the article with Borsi’s story in the first paragraph?

Cho hàm số \(y=\sqrt{2 x-x^{2}}\). Biết hàm số nghịch biến trên đoạn \((a; b)\), Tính \(a+2 b\).

Đối với điện trở màu, vòng màu thứ 2 chỉ:

Những tính năng cơ bản nào mà dịch vụ lưu trữ đám mây cung cấp cho người dùng?

Điểm chung của Cách mạng tháng Tám năm 1945, kháng chiến chống thực dân Pháp (1945 - 1954) và kháng chiến chống Mỹ, cứu nước (1954 - 1975) ở Việt Nam là có sự kết hợp

Trong thí nghiệm tán xạ hạt alpha của Rutherford, khi gặp lá vàng mỏng, hầu hết các hạt alpha

Nguyên tử nguyên tố M có số hiệu nguyên tử là 20. Electron cuối cùng của nguyên tử M điền vào lớp và phân lớp nào?

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 

At a florist’s …

a. A: How much are the roses?

b. B: Yes, they're on sale today.

c. B: Splendid. Will there be anything else?

d. B: $20 per dozen.

e. B: I'm sure your wife will love them.

f. A: I need some flowers for my wife. It's her birthday.

g. A: I'll take a dozen.

h. B: Very well. We have some fresh red roses.

i. A: No, the roses will be fine.

j. A: That sounds like a good deal.

Nếu chiều dài đường đi của điện tích trong điện trường tăng 2 lần thì công của lực điện trường