Hỗn hợp M gồm amin X, amino axit Y (X, Y đều no, mạch hở) và peptit Z (mạch hở tạo ra từ các α –amino axit no, mạch hở). Cho 0,2 mol hỗn hợp M tác dụng vừa đủ với 0,9 mol HCl hoặc 0,8 mol NaOH. Nếu đốt cháy hoàn toàn 0,2 mol hỗn hợp M, sau phản ứng hấp thụ toàn bộ sản phẩm cháy vào dung dịch Ca(OH)₂ dư thu được 150 gam kết tủa và khối lượng dung dịch giảm m gam. Giá trị của m gần nhất với?

A. 60

B. 65

C. 58

D. 55

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.

Criticism

The volume of traffic in many cities in the world today continues to expand. This (22) _______ many problems, including serious air pollution, lengthy delays, and the greater risk (23) _______ accidents. Clearly, something must be done, but it is often difficult to persuade people to change their habits and leave their cars at home.

One possible approach is to make it more expensive for people to use their cars be increasing charges for parking and brining in tougher fines for anyone who (24) _______ the law. In addition, drivers could be required to pay for using particular routes at different times of the day. This system, also known as ‘road pricing’, is already being introduced in a number of cities, using a special electronic card (25) _______ to windscreen of the car.

Another ways of dealing with the problem is to provide cheap parking on the outskirts of the city, and strictly control the number of vehicles allowed into the centre. Drivers and their passengers then use a special bus service for the final stage of their journey.

Of course, the most important (26) _______ is to provide good public transport. However, to get people to give up the comfort their cars, public transport must be felt to be reliable, convenient and comfortable, with fares charged at an acceptable level.

Điền vào ô trống 26

A. thought

B. thing

C. work

D. event

Cho các chất sau: NH₃, CH₃CH₂NH_2, C₆H₅NH₂, H₂NCH₂COOH. Chất có lực bazo mạnh nhất là

A. C₆H₅NH₂

B. CH₃CH₂NH₂

C. H₂NCH₂COOH

D. NH₃

Xét 4 tế bào sinh tinh có kiểu gen AaBbDd. Bốn tế bào này thực hiện quá trình giảm phân tạo giao tử, trong đó có 1 tế bào không phân ly cặp NST mang cặp gen Aa ở lần giảm phân I, lần giảm phân II xảy ra bình thường, các tế bào còn lại giảm phân bình thường. Theo lý thuyết, trong số các trường hợp phát sinh tỉ lệ giao tử sau đây, trường hợp nào không thể xảy ra?

A. 1:1:1:1

B. 1:1:1:1:1:1:1:1.

C. 3:3:1:1

D. 2:2:1:1:1:1.

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

The Red Cross is an international humanitarian agency dedicated to reducing the sufferings of wounded soldiers, civilians and prisoners of war.

A. happiness

B. loss

C. sadness

D. pain and sorrow

Một cơ thể dị hợp 3 cặp gen nằm trên 2 cặp NST tương đồng, khi giảm phân bình thường tạo giao tử BD  , kiểu gen của cơ thể và tần số hoán vị gen là:

A. A a B d b D ;   f = 30 %  

B.  A a B d b D ;   f = 40 %

C.  A a B D b d ;   f = 40 %

D.  A a B D b d ;   f = 30 %

Để nhận ra khí hiddro clorua trong số các khí đựng riêng biệt: HCl, SO₂, O₂ và H₂ ta làm như sau

A. dẫn từng khí qua dung dịch phenolphatalein

B. dẫn từng khí qua dung dịch AgNO₃

C. dẫn từng khí qua CuSO₄ khan, nung nóng

D. dẫn từng khí qua dung dịch KNO₃

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 23 to 27. Fill in the appropriate word in question 26

  Many people enjoy lying in bed in the morning, but can you imagine having to spend 90 days in bed? Could you stand the boredom and the frustration of not being (23) _____________ to get up? That was the task that faced 14 volunteers when they started out on a bed-rest experiment being conducted (24)_____________  the European Space Agency.

  The study had a serious purpose: to investigate the changes that take place in the human body during long-duration spaceflight. Lying in a horizontal position was the best way of (25)_____________  weightlessness. The aim was to discover what effect period of weightlessness will have on the health of astronauts spending several months on the International Space Station.

  The volunteers ate their meals, took showers and underwent medical tests without ever sitting up. That’s even tougher than it sounds, especially when you (26)_____________ that no visitors were permitted. However, each volunteer did have a mobile phone, as well as access to the latest films, computer games and music. Surprisingly, Everyone was in a good (27)_____________  at the end of the 90 days, “I would do it again,” said one of the volunteers. “It was disorientating, but we knew we were ‘contributing to medical research and space exploration.”

A. reckon

B. realise

C. regard

D. remark

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.

She finished her driving lesson. Her father allowed her to use his car.

A. Having finished her driving lesson, her father allowed her to use his car

B. Having finished her driving lesson, she was allowed to use her father’s car

C. To be allowed to use her father’s car, she tried to finish her driving lesson

D. Being allowed to use her father’s car, she tried to finish her driving lesson

Nhiệt phân 40,3 gam hỗn hợp X gồm KMnO₄ và KClO₃, sau một thời gian thu được khí O­₂ và 29,9 gam chất rắn Y gồm KMnO₄, K₂MnO₄, MnO₂ và KCl. Để hòa tan hoàn toàn Y cần vừa đủ dung dịch chứa 0,7 mol HCl. Phần trăm khối lượng KMnO₄ bị nhiệt phân là

A. 50%

B. 80%

C. 75%

D. 60%