Nghiệm của phương trình \(9 x^{4}+6 x^{2}+1=0\) 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 31 to 35:

BOOKS Nearly all the discoveries that have been made through the ages can (31)……in books. The invention of the book is one of humankind’s(32)………achievements, the importance of which can not be overestimated. Books are very adaptable, providing us with both entertainment and information. The production of books began in Ancient(33)………though not in the form that is accessible to us today. The books read by the Romans, however, have some similarities to the ones we read now. Until the middle of the 15th century, in Europe, all books were written by hand. They were often(34) …………illustrated and always rare and expensive. With printing came the possibility of cheap, large-scale publication and distribution of books making (35)………more widespread and recognizable.

Question 31:  

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 31 to 35:

Nearly all the discoveries that have been made through the ages can (31)……in books. The invention of the book is one of humankind’s(32)………achievements, the importance of which can not be overestimated. Books are very adaptable, providing us with both entertainment and information. The production of books began in Ancient(33)………though not in the form that is accessible to us today. The books read by the Romans, however, have some similarities to the ones we read now. Until the middle of the 15th century, in Europe, all books were written by hand. They were often(34) …………illustrated and always rare and expensive. With printing came the possibility of cheap, large-scale publication and distribution of books making (35)………more widespread and recognizable.  

Question 32:

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 31 to 35:

Nearly all the discoveries that have been made through the ages can (31)……in books. The invention of the book is one of humankind’s(32)………achievements, the importance of which can not be overestimated. Books are very adaptable, providing us with both entertainment and information. The production of books began in Ancient(33)………though not in the form that is accessible to us today. The books read by the Romans, however, have some similarities to the ones we read now. Until the middle of the 15th century, in Europe, all books were written by hand. They were often(34) …………illustrated and always rare and expensive. With printing came the possibility of cheap, large-scale publication and distribution of books making (35)………more widespread and recognizable.  

Question 33:

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 25:        

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 24:      

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 2:

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 1:

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 31 to 35:

The current global extinction rate is estimated at about 20,000 species per year, exponentially greater than the background extinction rate. Many (31) _____ believe that we are in the middle of the greatest mass extinction episode since the disappearance of the dinosaurs 65 million years ago. From what is known about present-day populations and from (32) _____ theory, the change in either the physical or the biological environment is the key to extinction. However, the vulnerability of a species depends (33) _____ a wide variety of factors, such as its total population size, geographical distribution, reproductive ability, ecological relations with other species, and genetic characteristics. For example, more emphasis is put on the greater vulnerability of species that reproduce slowly as contrasted with those that reproduce (34) _____. Other factors, such as food-plant specialization, may make many fast reproducers more vulnerable than species that reproduce more slowly. No matter (35) _____ fast an insect species that depends on a certain plan can reproduce; it will still go extinct if that plant's habitat is destroyed. It has been estimated that about one half billion species have lived at one time or another, and today's existing species are only 2% of those that have ever evolved. The other 98% have either died out or evolved into something sufficiently different to be called a new species.

Question 32: 

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 31 to 35:

The current global extinction rate is estimated at about 20,000 species per year, exponentially greater than the background extinction rate. Many (31) _____ believe that we are in the middle of the greatest mass extinction episode since the disappearance of the dinosaurs 65 million years ago. From what is known about present-day populations and from (32) _____ theory, the change in either the physical or the biological environment is the key to extinction. However, the vulnerability of a species depends (33) _____ a wide variety of factors, such as its total population size, geographical distribution, reproductive ability, ecological relations with other species, and genetic characteristics. For example, more emphasis is put on the greater vulnerability of species that reproduce slowly as contrasted with those that reproduce (34) _____. Other factors, such as food-plant specialization, may make many fast reproducers more vulnerable than species that reproduce more slowly. No matter (35) _____ fast an insect species that depends on a certain plan can reproduce; it will still go extinct if that plant's habitat is destroyed. It has been estimated that about one half billion species have lived at one time or another, and today's existing species are only 2% of those that have ever evolved. The other 98% have either died out or evolved into something sufficiently different to be called a new species.

Question 33:

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 31 to 35:

The current global extinction rate is estimated at about 20,000 species per year, exponentially greater than the background extinction rate. Many (31) _____ believe that we are in the middle of the greatest mass extinction episode since the disappearance of the dinosaurs 65 million years ago. From what is known about present-day populations and from (32) _____ theory, the change in either the physical or the biological environment is the key to extinction. However, the vulnerability of a species depends (33) _____ a wide variety of factors, such as its total population size, geographical distribution, reproductive ability, ecological relations with other species, and genetic characteristics. For example, more emphasis is put on the greater vulnerability of species that reproduce slowly as contrasted with those that reproduce (34) _____. Other factors, such as food-plant specialization, may make many fast reproducers more vulnerable than species that reproduce more slowly. No matter (35) _____ fast an insect species that depends on a certain plan can reproduce; it will still go extinct if that plant's habitat is destroyed. It has been estimated that about one half billion species have lived at one time or another, and today's existing species are only 2% of those that have ever evolved. The other 98% have either died out or evolved into something sufficiently different to be called a new species.

Question 31: