Hỗn hợp E gồm X, Y là hai axit đồng đẳng kế tiếp, Z, T là hai este (đều hai chức, mạch hở, Y và Z là đồng phân của nhau, M_T – M_Z = 14). Đốt cháy hoàn toàn 12,84 gam E cần vừa đủ 0,37 mol O₂, thu được CO₂ và H₂O. Mặt khác, cho 12,84 gam E phản ứng vừa đủ với 220ml dung dịch NaOH 1M. Cô cạn dung dịch sau phản ứng thu được hỗn hợp muối khan G của các axit cacboxylic và 2,8 gam hỗn hợp ba ancol có cùng số mol. Khối lượng muối của axit có phân tử khối lớn nhất trong G là 

A. 6,48. 

B. 2,68.

C. 3,24. 

D. 4,86.

Cho đoạn thẳng CD

Vẽ ba điểm N1, N2, N3 sao cho  C N 1 D ^ = C N 2 D ^ = C N 3 D ^ = 90 o

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

Personal space is a term that refers (23) ………. the distance we like to keep between ourselves and other people. When (24) …………. we do not know well gets too close we usually begin to feel uncomfortable. If a business colleague comes closer than 1.2 meters, the most common response is to move (25) ………. Some interesting (26) ……….. have been done in libraries. If strangers come too close, many people get up and leave the building; others use different methods such as turning their back on the intruder. Living in cities has made people develop new skills for dealing with situations where they are very close to strangers. Most people on crowded trains try not to look at strangers; they avoid skin contact, and apologize if hands touch by mistake. People use newspapers (27) …….. a barrier between themselves and other people, and if they do not have one, they stare into the distance, making sure they are not looking into anyone’s eyes.

Điền vào ô 24

A. people 

B. anyone 

C. someone 

D. nobody 

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks. Fill in the appropriate word in question 38

          What’s your dream? Touring castles in Scotland? Walking on the Great Wall of China? Working to improve the lives of women in rural Uganda? If you’re thinking of studying (30)___________, there’s no end to the places you can go, things you can see, and subjects you can study. At many top schools, such as Duke, Tufts, or Brown, over a third of the junior class take the opportunity to complete part of their (31)___________outside of the United States. Even if your school doesn’t have an extensive study abroad program, you can often get credit from a different school.

          Multiple benefits accrue to those who spend significant (32)___________in another country, and a significant proportion of students see the experience as an important (33)___________of their college years. You’re likely to have fun. But if you’re also thinking about study abroad as a way to gain a critical career advantage, read on. You’ll find that all foreign experiences are not created equal in the minds of employers.

          Employers are looking for graduates who can (34)___________well with others, both in person and in writing. They know the (35)___________of cross-cultural understanding and an appreciation for different points of view. They gravitate toward students who demonstrate maturity, initiative, and (36)___________. All of these assets can be demonstrated through study abroad, but it’s going to be much (37)___________to set yourself apart if you’ve taken the easy route.

          It’s not hard to find the “easy route”: that’s the one where you go with your friends to another country; all the arrangements are made for you by the school—including the American-style apartment where you live with your classmates. In this scenario, it doesn’t (38)___________which country you go to because all your classes will be in English, and possibly even taught by your American professors. You’ll undoubtedly have a somewhat different experience, but to do the “easy route” is to forego some of the major (39)___________of your time away

A. matter

B. show

C. problem

D. trouble

Cho 2,94 gam H₂NC₃H₅(COOH)₂ (axit glutamic) vào 160ml dung dịch HCl 0,25M, thu được dung dịch X. Cho X tác dụng với 200ml dung dịch NaOH 0,5M, thu được dung dịch Y. Cô cạn Y, thu được m gam chất rắn khan. Giá trị của m là

A. 6,16

B. 6,96

C. 7,00

D. 6,95

Thủy phân 4,3 gam este X đơn chức mạch hở (có xúc tác axit) đến khi phản ứng hoàn toàn thu được hỗn hợp hai chất hữu cơ Y và Z. Cho Y, Z phản ứng với dung dịch dư AgNO₃/NH₃ thu được 21,6 gam bạc. Công thức cấu tạo của X là

A. CH₃COOCH=CH₂

B. HCOOCH=CH-CH₃

C. HCOOCH₂CH=CH₂

D. HCOOC(CH₃)=CH₂

Marie Curie was the first and only woman ____________ two Nobel Prizes.

A. who win

B. that wins

C. to have won

D. to be won