Cho 2,76 gam chất hữu cơ A chứa C, H, O tác dụng với dung dịch NaOH vừa đủ, sau đó chưng khô thì phần bay hơi chỉ có nước, phần chất rắn khan còn lại chứa hai muối của natri chiếm khối lượng 4,44 gam. Nung nóng hai muối này trong oxi dư, sau khi phản ứng hoàn toàn, ta thu được 3,18 gam Na₂CO₃ 2,464 lít khí CO₂ (đktc) và 0,9 gam nước. Biết công thức đơn giản cũng là công thức phân tử. Công thức cấu tạo thu gọn của A là:

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 24 to 28:

The expression on your face can usually dramatically alter your feelings and perceptions, and it has been proved that deliberately smiling or frowning can create corresponding emotional responses. The idea was first (24) _______ by a French physiologist, Israel Waynbaum, in 1906. He believed that different facial (25) _______ affected the flow of blood to the brain, and that this could create positive or negative feelings. A happy smile or irrepressible laughter increased the blood flow and contributed to joyful feelings. But sad angry expressions decreased the flow of oxygen-carrying blood, and created a vicious (26) _______ of gloom and depression by effectively starving the brain of essential fuel. Psychologist Robert Zajone rediscovered this early subject, and suggests that the temperature of the brain could affect the production and synthesis of neurotransmitters, which definitely influence our moods and energy levels. He argues that an impaired blood flow could not only deprive the brain of oxygen, but also create further chemical imbalance (27) _______ inhibiting these vital hormonal messages. Zajone goes on to propose that our brains remember smiling associated with being happy, and that by deliberately smiling through your tears you can (28) _______ your brain to release uplifting neurotransmitters replacing a depression condition with a happier one. People suffering from psychosomatic ailment, depression and anxiety states could benefit from simply exercising their zygomatic muscles, which pull the corners of the mouth up and back to form a smile several times an hour.

Question 28:       

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 1 to 5:

In the past, it was common for three or more (1) ______ to live together in the same roof. Nowadays most elderly people live (2) ________their own. They generally stay in contact with their children or grandchildren but might live in the different part of the country. People also live together, often 20 years after they have (3) _________from their job. Modern American culture tends to value youth rather than age. This create an interesting challenge for older people and for the country. American families also have troubles. They are the divorce rate, the fact that working mothers might have (4)____________ time with their children, and the problems that parents and children sometimes misunderstand each other. (5)_________, family is still at the center of most people’s lives.

Question 5:

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 1 to 5:

In the past, it was common for three or more (1) ______ to live together in the same roof. Nowadays most elderly people live (2) ________their own. They generally stay in contact with their children or grandchildren but might live in the different part of the country. People also live together, often 20 years after they have (3) _________from their job. Modern American culture tends to value youth rather than age. This create an interesting challenge for older people and for the country. American families also have troubles. They are the divorce rate, the fact that working mothers might have (4)____________ time with their children, and the problems that parents and children sometimes misunderstand each other. (5)_________, family is still at the center of most people’s lives. 

Question 4:

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 1 to 5:

In the past, it was common for three or more (1) ______ to live together in the same roof. Nowadays most elderly people live (2) ________their own. They generally stay in contact with their children or grandchildren but might live in the different part of the country. People also live together, often 20 years after they have (3) _________from their job. Modern American culture tends to value youth rather than age. This create an interesting challenge for older people and for the country. American families also have troubles. They are the divorce rate, the fact that working mothers might have (4)____________ time with their children, and the problems that parents and children sometimes misunderstand each other. (5)_________, family is still at the center of most people’s lives. 

Question 3:

Choose the word or phrase (A, B, C or D) that best fits the blank space in the following passage:

                                                                      THE PERFORMING ARTS

In the past, British children were frequently encouraged to try out their performing skills for the benefit of adults. They did this by reading aloud, acting or (31) _______ a musical instrument. As they grew up they were taken to public places of entertainment - the theatre, opera, circus or ballet. They looked forward to these (32) _______ with great excitement and would remember and discuss what they had seen for many weeks afterwards. But nowadays television and computers supply an endless stream of easily (33) _______ entertainment, and children quickly accept these marvelous inventions as a very ordinary part of their everyday lives. For many children, the sense of witnessing a very (34) _______ live performance is gone forever. But all is not lost. The presence of a TV set may have encouraged a very lazy response from (35) _______ in their own homes, but the desire of those with ambitions to become performing artists themselves does not seem to have been at all diminished. And live performances in public are still relatively popular, albeit with an older, more specialist audience.  

Question 35:

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

Traditionally, Americans and Asians have very(20) _____ideas about love and marriage. Americans believe in ‘romantic’ marriage – a boy and a girl are (21)____ to each other, fall in love, and decide to marry each other. Asians, on the other hand, believe in contractual marriage – the parents of the bride and the groom decide on the marriage; and love – if it ever develops – is supposed to follow(22) _____, not precede it. To show the differences, a(23) ______was conducted among American, Chinese and Indian students to determine their attitudes (24)_____ love and marriage.

Question 24:

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

Traditionally, Americans and Asians have very(20) _____ideas about love and marriage. Americans believe in ‘romantic’ marriage – a boy and a girl are (21)____ to each other, fall in love, and decide to marry each other. Asians, on the other hand, believe in contractual marriage – the parents of the bride and the groom decide on the marriage; and love – if it ever develops – is supposed to follow(22) _____, not precede it. To show the differences, a(23) ______was conducted among American, Chinese and Indian students to determine their attitudes (24)_____ love and marriage.

Question 23:

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks from 24 to 28:

A child prodigy of four is receiving computer lessons at Brunei University, in London. Nicholas MacMahon is studying at university because he is too clever for school. A senior lecturer at the university, Valso Koshy, said that the boy was remarkably intelligent. Nicholas spoke fluently before he was one and by the time he was 18 months old, he was taking telephone (24) _______. This was soon followed by conversational French. These are the trademarks of a highly gifted child unusual but not unique. The strange thing about Nicholas is his reading - he taught himself to read before he could speak. Ms. Koshy, an expert (25) _______ gifted children, says Nicholas is quite exceptional. Yet “exceptional” underrates his amazing ability to read, almost from birth. “He was talking when he was one and we realized from the start that he could read,” his father said. “Soon after, he was correcting my spelling, words (26) _______ caterpillar. Now he (27) _______ insects by their Latin names.” The list of achievements is impressive, but frightening. A four-year-old who can (28) _______ a Boeing 747 from a DC 10, devours encyclopedias, read The Daily Telegraph and is well on the way to becoming a violin virtuoso is hardly normal.

Question 24:

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks from 24 to 28:

A child prodigy of four is receiving computer lessons at Brunei University, in London. Nicholas MacMahon is studying at university because he is too clever for school. A senior lecturer at the university, Valso Koshy, said that the boy was remarkably intelligent. Nicholas spoke fluently before he was one and by the time he was 18 months old, he was taking telephone (24) _______. This was soon followed by conversational French. These are the trademarks of a highly gifted child unusual but not unique. The strange thing about Nicholas is his reading - he taught himself to read before he could speak. Ms. Koshy, an expert (25) _______ gifted children, says Nicholas is quite exceptional. Yet “exceptional” underrates his amazing ability to read, almost from birth. “He was talking when he was one and we realized from the start that he could read,” his father said. “Soon after, he was correcting my spelling, words (26) _______ caterpillar. Now he (27) _______ insects by their Latin names.” The list of achievements is impressive, but frightening. A four-year-old who can (28) _______ a Boeing 747 from a DC 10, devours encyclopedias, read The Daily Telegraph and is well on the way to becoming a violin virtuoso is hardly normal.

Question 25:  

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks from 24 to 28:

A child prodigy of four is receiving computer lessons at Brunei University, in London. Nicholas MacMahon is studying at university because he is too clever for school. A senior lecturer at the university, Valso Koshy, said that the boy was remarkably intelligent. Nicholas spoke fluently before he was one and by the time he was 18 months old, he was taking telephone (24) _______. This was soon followed by conversational French. These are the trademarks of a highly gifted child unusual but not unique. The strange thing about Nicholas is his reading - he taught himself to read before he could speak. Ms. Koshy, an expert (25) _______ gifted children, says Nicholas is quite exceptional. Yet “exceptional” underrates his amazing ability to read, almost from birth. “He was talking when he was one and we realized from the start that he could read,” his father said. “Soon after, he was correcting my spelling, words (26) _______ caterpillar. Now he (27) _______ insects by their Latin names.” The list of achievements is impressive, but frightening. A four-year-old who can (28) _______ a Boeing 747 from a DC 10, devours encyclopedias, read The Daily Telegraph and is well on the way to becoming a violin virtuoso is hardly normal.

Question 27: