Muối A có công thức là C₃H₁₀O₃N₂, lấy 7,32 gam A phản ứng hết với 150 ml dung dịch KOH 0,5M. Cô cạn dung dịch sau phản ứng thì được phần hơi và phần chất rắn, trong phần hơi có 1 chất hữu cơ bậc 3, trong phần rắn chỉ là chất vô cơ. Khối lượng chất rắn là:

A. 6,06 gam

B. 6,90 gam

C. 11,52 gam

D. 9,42 gam.

Trong số các chất: metyl axetat, tristearin, glucozơ, fructozơ, saccarozơ, tinh bột, xenlulozơ, anilin, alanin, protein. Số chất tham gia phản ứng thủy phân là

A. 9   

B. 8   

C. 6   

D. 7

John will never buy you a drink - he's far too _____

A. tight-fisted       

B. pig-headed       

C. highly-strung    

D. easy - going

Nếu tăng hiệu điện thế ở hai đầu đường dây thì có lợi gì? Muốn vậy, chúng ta phải giải quyết những vấn đề gì?

Em hãy quan sát hình 18, 19 và nêu những điểm khác nhau giữa biến thái hoàn toàn và không hoàn toàn.

* 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 from 43 to 50.

  In addition to improved physical health, sport plays a primarily positive role in youth development, including improved academic achievement, higher self- esteem, fewer behavioural problems, and better psychosocial development. Many studies focus on the effects of sport on the five “C’ s” - competence, confidence, connections, character, and caring The many facets of playing sport - the discipline of training, learning teamwork, following the leadership of coaches and captains, learning to lose - provide lifelong skills for athletes.

  The literature on youth sport stresses the positive effects of participation in learning the important life skills of goal setting and time management combined with enjoyment; the development of a strong sense of morality; and the development of an appreciation of diversity. Studies have shown that children and youth participating in sport, when compared to peers who do not play sport, exhibit higher grades, expectations, and attainment; greater personal confidence and self-esteem; greater connections with school — that is, greater attachment and support from adults; stronger peer relationships; more academically oriented friends; greater family attachment and more frequent interactions with parents; more restraint in avoiding risky behaviour; and greater involvement in volunteer work.

  Sport provides opportunities for children and youth to engage in valuable and positive relationships with adults. Thus, it is a missed opportunity for children who are “gated” - or not included in sport - during early stages of childhood because they are less well behaved than other children. These children are being prevented from participating in the very thing that could help them learn to control and regulate their behaviour. Sport provides an opportunity for children to safely navigate and negotiate between right and wrong as they learn to interact with peers and adults. Research by Taliaferro et al. suggests that playing sport can even protect against suicide risk in youth. Compared to nonathletes, male athletes exhibit lower levels of hopelessness and suicidal ideation. Young males involved in multiple sports seem to gamer even more protection in this regard. Similar results were found for girls. Research on the role of exercise in adults confirms that it improves mood and alleviates many forms of depression. Bartko and Eccles found that youth who are highly involved in sport are more “psychologically resilient,” that is, better able to recover from problems. Eccles et al. found that sport participation protects young athletes against social isolation.

(Adaptedfrom: Sport is a way of life, Sun Star Baguio, Jan 10, 2017)

 According to the passage what is NOT increased by playing sports?

A. Having success in studying

B. Eating fresh, nutritious food 

C. Having good mental states

D. Feeling happy with your own abilities

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.

My sister said to me, “You are going to do the washing up, don’t forget.”

A. My sister told me to do the washing up.

B. My sister reminded me not to forget to do the washing up.

C. My sister reminded me to do the washing up.

D. My sister ordered me to do the washing up.

Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 36 to 42.

Life expectancy is the period of time that a person can expect to live. Life expectancy varies greatly between genders and cultures. It used to be that women had a lower life expectancy than men (1 in every 4 women died in childbirth), but now they live an average of four to five years longer than men. Life expectancy has been increasing rapidly over the last centuries. With the advent of such modern miracles as sewers, medicine and a greater understanding of how diseases are spread, our life expectancy has increased by 25-30 years.

In developing countries like Swaziland, where there is a high HIV/ AIDS rate, life expectancy is as low as 32.6 years. In developed countries like Australia, life expectancy rates are as high as 81 years. There are an increasing number of factors which can cancel out the disadvantages you have. The one that we are looking at now is how your career can affect your life expectancy. Choosing the wrong career can result in a shorter life!

If you want your career to positively influence your life expectancy, you have to be made of money. That's right. Rich people in wealthy areas of England and France live 10 years longer than the people in poorer areas. Having a successful career has its drawbacks, too if the result of hard work is stress.

Stress can lead to a number of psychological disorders such as depression, anxiety, fatigue, tension and aggression. These conditions may result in a lack of concentration and an increase in serious injuries at work. They can also lead to high blood pressure and heart attacks which seriously affect life expectancy.

If you are worried that your job might decrease your life expectancy, you probably need to avoid careers on "dangerous jobs" list such as timber cutters, pilots, construction workers, roofer, truck drivers.

So if you don't want to kick the bucket at an early age, choose a career in something other than timber cutting, but above all, remember to relax.

From Pre-Essence Reading by Rachel Lee, Longman

Question 42: What is the main idea of the 1^st paragraph?

A. Stress negatively affects life expectancy.

B. Stress results in lower life expectancy.

C. Making a bad career choice will make your life shorter.

D. Life expectancy has increased greatly over the last few centuries.

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

_________ calculations have shown that the earth’s resources may run out before the end of the next century.

A. Crude

B. Blunt

C. Rude

D. Raw