Cho a mol este X (C₉H₁₀O₂) tác dụng vừa đủ với 2a mol NaOH, thu được dung dịch không có phản ứng tráng bạc. Số công thức cấu tạo phù hợp của X là

A. 3.  

B. 4. 

C. 2.  

D. 6.

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 30 to 34.

       Good press photographer must have an ‘eye’ for news, just as journalists must have a nose for a good

story. They must be able to interpret a story and decide rapidly how they can take advantage (30)                              _______

the best opportunities to take picture. The most difficult part of a press photographer’s job is that he or she has to be able to (31)_______a complicated situation with just one photograph. They rarely have second chances and must be able to take the required shot very quickly. Indeed, speed is essential- if the photographs are not ready for the printing deadline, they are very unlikely to be of any use.

       Most press photographers begin work with a local newspaper. There, the demand is mostly for material of regional interest. Photographers may be expected to photograph a lot of unexciting events but to (32)___________the enthusiasm to put ‘something special’ into every picture.

        There is (33) _______competition among those (34)_______want to move from local to national newspapers. Here, the work is much more centered on news. The photographer must work under greater pressure and take more responsibility. Only highly reliable, talented and resourceful photographers make this difficult move. The work is tough and can be dangerous. On an overseas assignment, photographers may have to cope with unfamiliar food and accommodation, physical and mental stress, and extreme difficulty in transporting the pictures from an isolated area to get to the newspaper on time. They also have to beat the competition from other publications.

Điền vào số 32

A. hold on

B. keep up

C. carry on

D. stay up

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 30 to 34.

       Good press photographer must have an ‘eye’ for news, just as journalists must have a nose for a good

story. They must be able to interpret a story and decide rapidly how they can take advantage (30)                              _______

the best opportunities to take picture. The most difficult part of a press photographer’s job is that he or she has to be able to (31)_______a complicated situation with just one photograph. They rarely have second chances and must be able to take the required shot very quickly. Indeed, speed is essential- if the photographs are not ready for the printing deadline, they are very unlikely to be of any use.

       Most press photographers begin work with a local newspaper. There, the demand is mostly for material of regional interest. Photographers may be expected to photograph a lot of unexciting events but to (32)___________the enthusiasm to put ‘something special’ into every picture.

        There is (33) _______competition among those (34)_______want to move from local to national newspapers. Here, the work is much more centered on news. The photographer must work under greater pressure and take more responsibility. Only highly reliable, talented and resourceful photographers make this difficult move. The work is tough and can be dangerous. On an overseas assignment, photographers may have to cope with unfamiliar food and accommodation, physical and mental stress, and extreme difficulty in transporting the pictures from an isolated area to get to the newspaper on time. They also have to beat the competition from other publications.

Điền vào số 31

A. draw up

B. put out

C. sum up

D. turn out

Đánh dấu X vào vuông cho ý KHÔNG ĐÚNG về ưu điểm của hệ thần kinh dạng chuỗi hạch.

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.

He was so insubordinate that he lost his job within few weeks.

A. fresh

B. disobedient

C. obedient

D. understanding

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 35 to 42.

Music can bring us to tears or to our feet, drive us into battle or lull us to sleep. Music is indeed remarkable in its power over all humankind, and perhaps for that very reason, no human culture on earth has ever lived without it. From discoveries made in France and Slovenia, even Neanderthal man, as long as 53,000 years ago, had developed surprisingly sophisticated, sweet-sounding flutes carved from animal bones. It is perhaps then, no accident that music should strike such a chord with the limbic system – an ancient part of our brain, evolutionarily speaking, and one that we share with much of the animal kingdom. Some researchers even propose that music came into this world long before the human race ever did. For example, the fact that whale and human music have so much in common even though our evolutionary paths have not intersected for nearly 60 million years suggests that music may predate humans. They assert that rather than being the inventors of music, we are latecomers to the musical scene.

Humpback whale composers employ many of the same tricks that human songwriters do. In addition to using similar rhythms, humpbacks keep musical phrases to a few seconds, creating themes out of several phrases before singing the next one. Whale songs in general are no longer than symphony movements, perhaps because they have a similar attention span. Even thoughthey can sing over a range of seven octaves, the whales typically sing in key, spreading adjacent notes no farther apart than a scale. They mix percussive and pure tones in pretty much the same ratios as human composers – and follow their ABA form, in which a theme is presented, elaborated on and then revisited in a slightly modified form. Perhaps most amazing, humpback whale songs include repeating refrains that rhyme. It has been suggested that whales might use rhymes for exactly the same reasons that we do: as devices to help them remember. Whale songs can also be rather catchy. When a few humpbacks from the Indian Ocean strayed into the Pacific, some of the whales they met there quickly changed their tunes – singing the new whales’ songs within three short years. Some scientists are even tempted to speculate that a universal music awaits discovery.

The plane had taken off. Paul realized he was on the wrong flight.

A. Not until the plane had taken off, did Paul realize he was on the wrong flight. 

B. It was not until the plane had taken off, did Paul realize he was on the wrong flight. 

C. Hardly had Paul realized he was on the wrong flight when the plane took off. 

D. No sooner had the plane taken off than Paul had realized he was on the wrong flight.

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 35 to 42.

Music can bring us to tears or to our feet, drive us into battle or lull us to sleep. Music is indeed remarkable in its power over all humankind, and perhaps for that very reason, no human culture on earth has ever lived without it. From discoveries made in France and Slovenia, even Neanderthal man, as long as 53,000 years ago, had developed surprisingly sophisticated, sweet-sounding flutes carved from animal bones. It is perhaps then, no accident that music should strike such a chord with the limbic system – an ancient part of our brain, evolutionarily speaking, and one that we share with much of the animal kingdom. Some researchers even propose that music came into this world long before the human race ever did. For example, the fact that whale and human music have so much in common even though our evolutionary paths have not intersected for nearly 60 million years suggests that music may predate humans. They assert that rather than being the inventors of music, we are latecomers to the musical scene.

Humpback whale composers employ many of the same tricks that human songwriters do. In addition to using similar rhythms, humpbacks keep musical phrases to a few seconds, creating themes out of several phrases before singing the next one. Whale songs in general are no longer than symphony movements, perhaps because they have a similar attention span. Even thoughthey can sing over a range of seven octaves, the whales typically sing in key, spreading adjacent notes no farther apart than a scale. They mix percussive and pure tones in pretty much the same ratios as human composers – and follow their ABA form, in which a theme is presented, elaborated on and then revisited in a slightly modified form. Perhaps most amazing, humpback whale songs include repeating refrains that rhyme. It has been suggested that whales might use rhymes for exactly the same reasons that we do: as devices to help them remember. Whale songs can also be rather catchy. When a few humpbacks from the Indian Ocean strayed into the Pacific, some of the whales they met there quickly changed their tunes – singing the new whales’ songs within three short years. Some scientists are even tempted to speculate that a universal music awaits discovery.

Which of the following is NOT true about humpback whale music?

A. It uses similar patterns to human songs. 

B. It’s in a form of creating a theme, elaborating and revisiting in rhyming refrains. 

C. It’s easy to learn by other whales. 

D. It’s comparative in length to symphony movements.