Dãy gồm các chất đều tác dụng với A g N O 3 / N H 3  là:

A. anđehit axetic, but-l-in, etilen

B. anđehit axetic, axetilen, but-2-in

C. axit fomic, vinylaxetilen, propin

D. anđehit fomic, axetilen, etilen.

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

Ever since it was first possible to make a real robot, people have been hoping for the invention of a machine that would do all the necessary jobs around the house. If boring and repetitive factory work could be (37) ________ by robots, why not boring and repetitive household chores too? 
For a long time the only people who really gave the problem their attention were amateur inventors And they came up against a major difficulty. That is, housework is actually very complex It has never been one job it has always been many. A factor robot (38) ________ one task endlessly until it is reprogrammed to do something else. It doesn’t run the whole factory. A housework robot on the other hand, has to do several different (39) ________ of cleaning and carrying jobs and also has to cope (40) ________ all the different shapes and positions of rooms, furniture, ornaments, cats and dogs. (41) ________, there have been some developments recently. Sensors are available to help the robot locate objects and avoid obstacles. We have the technology to produce the hardware. All that is missing the software- the programs that will operate the machine.
Question 39:

A. systems

B. types

C. ways

D. methods

Công nghiệp silicat là ngành công nghiệp chế biến các hợp chất của silic. Ngành sản xuất nào sau đây không thuộc về công nghiệp silicat?

A. Sản xuất đồ gốm (gạch, ngói, sành, sứ)

B. Sản xuất xi măng

C. Sản xuất thủy tinh

D. Sản xuất thủy tinh hữu cơ

Người ta thường dùng cát (SiO₂) làm khuôn đúc kim loại. Để làm sạch hoàn toàn những hạt cát bám trên bề mặt vật dụng làm bằng kim loại có thể dùng dung dịch nào sau đây?

A. Dung dịch HCl

B. Dung dịch HF

C. Dung dịch NaOH loãng

D. Dung dịch H₂SO₄

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

Water pollution occurs when chemicals or substances that make water contaminated are discharged directly or indirectly into water bodies without enough ______ to get rid of harmful compounds

A. treatable

B. treated

C. treating

D. treatment

Nguyên tố phổ biến thứ hai ở vỏ trái đất là

A. oxi

B. cacbon

C. silic

D. sắt

Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions

A. facilities

B. particular

C. inhabitant

D. governmental

Trong các phản ứng hóa học sau, phản ứng nào sai?

Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

A. developed

B. addicted

C. influenced

D. distinguished

Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

A. hydro

B. lifestyle

C. environment

D. immigrant