Cho dãy các chất: anđehit axetic, axetilen, glucozơ, axit axetic, metyl axetat. Số chất trong dãy có khả năng tham gia phản ứng tráng bạc là

A. 2   

B. 4   

C. 5   

D. 3

Các ion có thể tồn tại trong cùng một dung dịch là

A. Na⁺, NH₄⁺, SO₄^2-, Cl^-.

B. Mg²⁺, Al³⁺, NO₃^-, CO₃^2-.

C. Ag⁺, Mg²⁺, NO₃^-, Br^-.

D. Fe²⁺, Ag⁺, NO₃^-, CH₃COO^-.

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

Mary wears high heels to look taller.

A. Mary wants high heels to make her taller.

B. So that to look taller, Mary wears high heels 

C. In order to look taller, Mary wears high heels.

D. Mary buys high heels to look taller.

Buy me a newspaper on your way back,_________?

A: can’t you

B:do you

C:don’t you

D: will you

Đốt cháy hoàn toàn 4,3 gam chất hữu cơ X, rồi dẫn toàn bộ sản phẩm đốt cháy vào dung dịch Ca(OH)₂ dư có 20 gam kết tủa xuất hiện, độ giảm khối lượng dung dịch là 8,5 gam. Biết M_X < 100. CTPT của X là

A. C₅H₁₀O₂

B. C₃H₆O₂

C. C₄H₈O₂

D. C₄H₆O₂

The village was_________visible through the dense fog

A: only

B:hard

C:mostly

D: barely

Hãy nêu nguyên nhân và cách điều chỉnh mũi may bị sùi chỉ, rối chỉ, đứt chỉ, đường may bị dúm.

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. Fill in the appropriate word in question 28

MAKING THE MOST OF YOUR TIME

These days we are under pressure to increase the amount of work we can achieve in the shortest time. The pace of life threatens to leave many of us behind, and (25)_____ of this pressure we spend time looking for short-cuts in our working lives. However, these time-saving measures may actually cause more problems than they solve.

Some organisations seem to expect staff to work more than the usual eight hours, without recognising the fact that tiredness causes people to make silly mistakes and leads to (26) _______ working practices. Try setting clear (27) ______in your everyday work, however, you must be careful that these are not unrealistic and can be achieved within the working day. We tend to (28)______people who can multi-task because we think they are working hard – but do all the electronic gadgets they use increase their efficiency in the long run? Instead, they may distract them from the task in hand and cause a loss of concentration. Maybe (29) ________ with every email or mobile phone call immediately is not the best use of anyone’s time. To sum up, my advice is to keep everything simple, and prioritise tasks - you will become happier at work – and so will your boss!

A. go out with

B. get through to

C. catch up with

D. look up to

Có bốn dung dịch đựng riêng biệt trong bốn ống nghiệm không dán nhãn: K₂CO₃, FeCl₂, NaCl, CrCl₃. Nếu chỉ dùng một thuốc thử duy nhất là dung dịch Ba(OH)₂ thì nhận biết được tối đa bao nhiêu dung dịch trong số các dung dịch trên?

A. 3

B. 4

C. 2

D. 1

Nêu các bộ phận chính của máy may.