Cho các dung dịch riêng rẽ của các chất sau: methylamine, aniline, glycine, glutamic acid. Dung dịch làm đổi màu quỳ tím thành đỏ là dung dịch của

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

Casey started working as a restaurant manager ten years ago.

Đâu không phải là thế mạnh của nguồn lao động nước ta hiện nay?

Một học sinh cần tìm ví dụ minh họa cho thành tựu sinh vật chuyển gene. Sinh vật nào sau đây là ví dụ đúng về sinh vật chuyển gene?

Cho hình chóp S. ABCDcó đáy ABCD là hình thoi cạnh a, SA vuông góc với mặt phẳng đáy, $SA=BD=\sqrt{3}a$. Góc giữa đường thẳng SC và mặt phẳng $\left(ABCD\right)$ bằng?

Những phát biểu nào sau đây là đúng?

Kênh đào Xuy-ê có vai trò quan trọng đối với việc vận chuyển hàng hóa nào từ các nước Trung Đông đến các nền kinh tế phát triển?

Choose A, B, C or D that has the CLOSEST meaning to the underlined word/phrase in each question.

People believe that cities of the future will increase the general well-being of individuals and societies.

Một căn bệnh có $1\%$ dân số mắc phải. Một phương pháp chuẩn đoán được phát triển có tỷ lệ chính xác là $99\%$. Với những người bị bệnh, phương pháp này sẽ đưa ra kết quả dương tính $99\%$. Với người không mắc bệnh, phương pháp này cũng chuẩn đoán đúng $99$ trong $100$ trường hợp. Nếu một người kiểm tra và kết quả dương tính, xác suất để người đó bị bệnh là

Read the passage carefully. Choose an option (A, B, C or D) that best answers each question from 16 to 22.

1. Like many emergency responders, Nicholas Groom is used to stress at work.  On the one hand, the stress can be helpful. “I find that when attending a serious incident, it helps me to maintain focus on the situation,” Nicholas Groom said. On the other hand, the work can be highly pressurized. “Too much stress can impair your ability to make decisions,” he adds. And Groom is not alone in his complicated relationship with stress.

2. Many people believe that there should be a balanced amount of stress. In other words, not too much stress so you’re not overwhelmed but not too little stress so you don’t feel unmotivated. After all, some anxiety is motivating; think of the adrenaline before a deadline or the excitement before a competition.  Sports fans sometimes even talk about a “gene” in some athletes who seem to play best in the decisive final moments of a match. Furthermore, many psychologists claim that performance in many situations increases with stress up to a point. Of course, any stress can cause harm when it’s prolonged. To take just one example, a long-term high heart rate is linked to cardiovascular diseases. And additional stressors, such as financial pressures or psychiatric issues, clearly affect how beneficially someone can respond to stress.  

3. So is there a way to harness stress to your advantage while being mindful of its detrimental long-term effects? One key factor is to avoid, whenever possible, the point when stress leads to mental and physical collapse. Crystal Wernicke, 30, has always used stress as a motivator. But juggling between parenting, a full-time job, a voluntary role and financial troubles at the same time became too much and eventually led to a two-month period of illness. Another factor is the presence of control. For those who feel powerless over their situation, stress is unlikely to be beneficial. But with some autonomy over stressful tasks, we are better able to convert that pressure into higher performance.

4. When it comes to stress and how it affects your performance, it’s helpful to recognize the variations in personality, type of stress and task that affect the level of pressure you are under, as well as understanding tools you can use to control and harness that stress. Ultimately, it’s not helpful to take a one-sided view, either demonizing or glorifying stress. As James C Quick, a management professor at the University of Texas, sums up: “Stress can be the kiss of death as well as the spice of life.”

What is “detrimental” in paragraph 3 closest in meaning to?

Tín hiệu khuếch đại ở đầu ra ngược pha với tín hiệu đầu vào là tín hiệu được thực hiện từ mạch

Vấn đề nào sau đây thuộc về an ninh truyền thống?

Khoáng sản ở khu vực Mỹ Latinh tập trung chủ yếu ở những khu vực nào?

Anion M²⁺ có cấu hình electron giống với nguyên tử khí hiếm argon. Số hiệu nguyên tử của nguyên tố M là

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 26 to 30.

We all had the experience of trying to learn something new only to find out that we're not very good at it. We look around at (26) _______ people we are learning with, those seemingly more gifted than us. It seems to come naturally to them.

Undoubtedly, there are people (27) _______ are brilliant at certain things. (28) _______ , many of them are not really born with talents. Psychologist K. Andrers Ericsson studied students at Berlin's Academy of Music. He found that while all the participants in the study had all the (29) _______ of world famous musicians, only some of them actually reached international stardom. What made the difference? The answer is simple: practice. The people that became (30) _______ were more competitive and practised about 2,000 hours more than others. It turns out that practice really does make perfect.

(Adapted from Empower)

The answer of question 27:

Cho hình lập phương \(A B C D \cdot A^{\prime} B^{\prime} C^{\prime} D^{\prime}\) có cạnh bằng \(a\). Gọi \(K\) là trung điểm của \(D D^{\prime}\). Khoảng cách giữa hai đường thẳng \(C K\) và \(A^{\prime} D\) bằng \(\frac{a}{k}\). Giá trị của \(k\) bằng bao nhiêu?