Một đoạn mạch AB gồm hai đoạn mạch AM và MB mắc nối tiếp. Đoạn mạch AM gồm điện trở thuần R₁ mắc nối tiếp với tụ điện có điện dung C, đoạn mạch MB gồm điện trở thuần R₂ mắc nối tiếp với cuộn cảm thuần có độ tự cảm L. Đặt điện áp xoay chiều có tần số và giá trị hiệu dụng không đổi vào hai đầu đoạn mạch AB. Khi đó đoạn mạch AB tiêu thụ công suất bằng 120 W và có hệ số công suất bằng 1. Nếu nối tắt hai đầu tụ điện thì điện áp hai đầu đoạn mạch AM và MB có cùng giá trị hiệu dụng nhưng lệch pha nhau π/3, công suất tiêu thụ trên đoạn mạch AB trong trường hợp này bằng:

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:

Throughout history, women have always aimed for a recognized place in (31) ________. Guided by their own (32) ________ of knowledge and expertise, women like Marie Curie in science, Mary Wollstonecraft in literary writing, Simone de Beauvois in philosophical existentialist debate, and Marie Stopes in medicine, to name a few, have brought about an awareness of the role of the women in any walks of life. These women have helped redefine and (33) ________ the nature of women’s place in society. Today the spread of global women’s organizations and the impact of women’s contributions to society show that progress has been made and the progress in furthering the role of women in society has been some benefits to the (34) ________ woman. It is true to say that not all women have the same need. The need of the woman who stays at home and raises children will differ widely from the woman who works outside. Nonetheless, in the extensive field of equal opportunities, it would be good to know that access is given to both with equal measure according to the true value of respective abilities. It also would be good to know that the woman at home is recognized as a valued (35) ________ of society just as much as the one who deals on business outside the home.

 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:

Throughout history, women have always aimed for a recognized place in (31) ________. Guided by their own (32) ________ of knowledge and expertise, women like Marie Curie in science, Mary Wollstonecraft in literary writing, Simone de Beauvois in philosophical existentialist debate, and Marie Stopes in medicine, to name a few, have brought about an awareness of the role of the women in any walks of life. These women have helped redefine and (33) ________ the nature of women’s place in society. Today the spread of global women’s organizations and the impact of women’s contributions to society show that progress has been made and the progress in furthering the role of women in society has been some benefits to the (34) ________ woman. It is true to say that not all women have the same need. The need of the woman who stays at home and raises children will differ widely from the woman who works outside. Nonetheless, in the extensive field of equal opportunities, it would be good to know that access is given to both with equal measure according to the true value of respective abilities. It also would be good to know that the woman at home is recognized as a valued (35) ________ of society just as much as the one who deals on business outside the home.

 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:

Throughout history, women have always aimed for a recognized place in (31) ________. Guided by their own (32) ________ of knowledge and expertise, women like Marie Curie in science, Mary Wollstonecraft in literary writing, Simone de Beauvois in philosophical existentialist debate, and Marie Stopes in medicine, to name a few, have brought about an awareness of the role of the women in any walks of life. These women have helped redefine and (33) ________ the nature of women’s place in society. Today the spread of global women’s organizations and the impact of women’s contributions to society show that progress has been made and the progress in furthering the role of women in society has been some benefits to the (34) ________ woman. It is true to say that not all women have the same need. The need of the woman who stays at home and raises children will differ widely from the woman who works outside. Nonetheless, in the extensive field of equal opportunities, it would be good to know that access is given to both with equal measure according to the true value of respective abilities. It also would be good to know that the woman at home is recognized as a valued (35) ________ of society just as much as the one who deals on business outside the home.

 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:

Throughout history, women have always aimed for a recognized place in (31) ________. Guided by their own (32) ________ of knowledge and expertise, women like Marie Curie in science, Mary Wollstonecraft in literary writing, Simone de Beauvois in philosophical existentialist debate, and Marie Stopes in medicine, to name a few, have brought about an awareness of the role of the women in any walks of life. These women have helped redefine and (33) ________ the nature of women’s place in society. Today the spread of global women’s organizations and the impact of women’s contributions to society show that progress has been made and the progress in furthering the role of women in society has been some benefits to the (34) ________ woman. It is true to say that not all women have the same need. The need of the woman who stays at home and raises children will differ widely from the woman who works outside. Nonetheless, in the extensive field of equal opportunities, it would be good to know that access is given to both with equal measure according to the true value of respective abilities. It also would be good to know that the woman at home is recognized as a valued (35) ________ of society just as much as the one who deals on business outside the home.

 Question 35:

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:

Throughout history, women have always aimed for a recognized place in (31) ________. Guided by their own (32) ________ of knowledge and expertise, women like Marie Curie in science, Mary Wollstonecraft in literary writing, Simone de Beauvois in philosophical existentialist debate, and Marie Stopes in medicine, to name a few, have brought about an awareness of the role of the women in any walks of life. These women have helped redefine and (33) ________ the nature of women’s place in society. Today the spread of global women’s organizations and the impact of women’s contributions to society show that progress has been made and the progress in furthering the role of women in society has been some benefits to the (34) ________ woman. It is true to say that not all women have the same need. The need of the woman who stays at home and raises children will differ widely from the woman who works outside. Nonetheless, in the extensive field of equal opportunities, it would be good to know that access is given to both with equal measure according to the true value of respective abilities. It also would be good to know that the woman at home is recognized as a valued (35) ________ of society just as much as the one who deals on business outside the home.

 Question 34:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the best option for each of the blanks.

Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes harm ecosystems. If there is too ___26__ rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals that feed on it may also die or move away. Some changes are good for ecosystems. Some pine forests need fire for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds ___27___. Polluting the air, soil, and water can harm ecosystems. Building ___28___ on rivers for electric power and irrigation can harm ecosystems around the rivers. Bulldozing wetlands and cutting down ___29___ destroy ecosystems. Ecologists are working with companies and governments to find better ways of catching fish, cutting down trees, and building dams. They are looking for ways to get food, lumber, and other products for people ___30___ causing harm to ecosystems.   

Question 30:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the best option for each of the blanks.

Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes harm ecosystems. If there is too ___26__ rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals that feed on it may also die or move away. Some changes are good for ecosystems. Some pine forests need fire for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds ___27___. Polluting the air, soil, and water can harm ecosystems. Building ___28___ on rivers for electric power and irrigation can harm ecosystems around the rivers. Bulldozing wetlands and cutting down ___29___ destroy ecosystems. Ecologists are working with companies and governments to find better ways of catching fish, cutting down trees, and building dams. They are looking for ways to get food, lumber, and other products for people ___30___ causing harm to ecosystems.

Question 29:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the best option for each of the blanks.

Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes harm ecosystems. If there is too ___26__ rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals that feed on it may also die or move away. Some changes are good for ecosystems. Some pine forests need fire for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds ___27___. Polluting the air, soil, and water can harm ecosystems. Building ___28___ on rivers for electric power and irrigation can harm ecosystems around the rivers. Bulldozing wetlands and cutting down ___29___ destroy ecosystems. Ecologists are working with companies and governments to find better ways of catching fish, cutting down trees, and building dams. They are looking for ways to get food, lumber, and other products for people ___30___ causing harm to ecosystems.

Question 27:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the best option for each of the blanks.

Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes harm ecosystems. If there is too ___26__ rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals that feed on it may also die or move away. Some changes are good for ecosystems. Some pine forests need fire for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds ___27___. Polluting the air, soil, and water can harm ecosystems. Building ___28___ on rivers for electric power and irrigation can harm ecosystems around the rivers. Bulldozing wetlands and cutting down ___29___ destroy ecosystems. Ecologists are working with companies and governments to find better ways of catching fish, cutting down trees, and building dams. They are looking for ways to get food, lumber, and other products for people ___30___ causing harm to ecosystems.

Question 26:

Question 31

THOMAS EDISON

On the night of 21 October 1931, millions of Americans took part in a coast-to-coast ceremony to commemorate the passing of a great man. Lights (31) _______ in homes and offices from New York to California. The ceremony marked the death of arguably the most important inventor of all time: Thomas Edison.

Few inventors have (32) _______ such an impact on everyday life, and many of his inventions played a crucial role in the development of modern technology. One should never (33) _______ how revolutionary some of Edison’s inventions were.

In many ways, Edison is the perfect example of an inventor - that is, not just someone who dreams up clever gadgets, but someone whose products transform the lives of millions. He possessed the key characteristics that an inventor needs to (34) _______ a success of inventions, notably sheer determination. Edison famously tried thousands of materials while working on a new type of battery, reacting to failure by cheerfully announcing to his colleagues: 'Well, (35) _______ we know 8,000 things that don’t work.’ Knowing when to take no notice of experts is also important. Edison’s proposal for electric lighting circuitry was received with total disbelief by eminent scientists, until he lit up whole streets with his lights.