Phân vi sinh vật phân giải chất hữu cơ được sử dụng bằng cách:

Cho m gam Cu vào 100 ml dung dịch sau một thời gian thì lọc được 10,08 gam hỗn hợp 2 kim loại và dung dịch Y. Cho 2,4 gam Mg vào Y, phản ứng kết thúc thì lọc được 5,92 gam hỗn hợp kim loại. Giá trị của m là:

Cho dãy các kim loại: K, Mg, Cu, Al. Số kim loại trong dãy phản ứng được với dung dịch HCl là: 

Dung dịch H₂SO₄ loãng không phản ứng với kim loại nào dưới đây?

Cho nguyên tố X có Z = 20. a.       Viết cấu hình electron của nguyên tử X. X có tính kim loại hay tính phi kim. X là nguyên tố s, p, d, hay f? Vì sao? b.       Xác định vị trí của X ( số thứ tự, chu kì, nhóm) trong bảng tuần hoàn. c.       Hóa trị cao nhất trong hợp chất với Oxi. d.       Công thức của Oxit cao nhất, của hidrroxit tương ứng và tính chất của nó (tính axit,bazo).  

Read the following pasage 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:

Our classes take place for three hours every morning from Monday to Friday. The (31)_________ class size is twelve and the average is ten. We use modern methods (32)_________ teaching  and learning, and the school has a language laboratory, a video camera and recorders. You will only be successful in improving your English; however, if you work hard and practise speaking English as much as you can. You will take a short (33)_________ in English as soon as you arrive. In this way, we can put you in a (34)_________ at the most suitable level. The emphasis is on oral communication practice in a wide (35)_________ of situations at the advanced knowledge. You will learn how to use language correctly and appropriately when you talk to native speakers. In addition, you will develop such study skills as reading efficiently, writing articles and reports, and note-taking from books and lectures.  

Question 32:             

Read the following pasage 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:

Our classes take place for three hours every morning from Monday to Friday. The (31)_________ class size is twelve and the average is ten. We use modern methods (32)_________ teaching  and learning, and the school has a language laboratory, a video camera and recorders. You will only be successful in improving your English; however, if you work hard and practise speaking English as much as you can. You will take a short (33)_________ in English as soon as you arrive. In this way, we can put you in a (34)_________ at the most suitable level. The emphasis is on oral communication practice in a wide (35)_________ of situations at the advanced knowledge. You will learn how to use language correctly and appropriately when you talk to native speakers. In addition, you will develop such study skills as reading efficiently, writing articles and reports, and note-taking from books and lectures.  

Question 31:         

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 1 to 5:

A surprising number of popular spectator sports, for example football or baseball, (1)______ in Europe or the USA in the nineteenth century. This did not happen by chance. It was the (2) ______ of changes in the way people lived in those places at that time. Until then, more people lived in the country than in towns. They worked in small groups and had no regular time off. All this changed with the growth of factories and industry in the nineteenth century, first in Europe and (3) ______ in the USA. For the first time, most people began to live in towns, and they found themselves with regular free time. They had more leisure time than ever before. This resulted in the need for organized entertainment. Suitable games developed or were invented, typically team games, in which the crowd could (4) ______ sides and become involved. This gave people some of the entertainment they need in their free time. The recent explosion in TV, with the introduction of satellite and cable channels, has caused an increase in (5) ______ for sports as entertainment. The money TV has brought to games such as football, tennis and baseball means that spectator sports will certainly go on playing an important part in our lives.  

Question 1:

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 1 to 5:

A surprising number of popular spectator sports, for example football or baseball, (1)______ in Europe or the USA in the nineteenth century. This did not happen by chance. It was the (2) ______ of changes in the way people lived in those places at that time. Until then, more people lived in the country than in towns. They worked in small groups and had no regular time off. All this changed with the growth of factories and industry in the nineteenth century, first in Europe and (3) ______ in the USA. For the first time, most people began to live in towns, and they found themselves with regular free time. They had more leisure time than ever before. This resulted in the need for organized entertainment. Suitable games developed or were invented, typically team games, in which the crowd could (4) ______ sides and become involved. This gave people some of the entertainment they need in their free time. The recent explosion in TV, with the introduction of satellite and cable channels, has caused an increase in (5) ______ for sports as entertainment. The money TV has brought to games such as football, tennis and baseball means that spectator sports will certainly go on playing an important part in our lives.

Question 2:

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 1 to 5:

A surprising number of popular spectator sports, for example football or baseball, (1)______ in Europe or the USA in the nineteenth century. This did not happen by chance. It was the (2) ______ of changes in the way people lived in those places at that time. Until then, more people lived in the country than in towns. They worked in small groups and had no regular time off. All this changed with the growth of factories and industry in the nineteenth century, first in Europe and (3) ______ in the USA. For the first time, most people began to live in towns, and they found themselves with regular free time. They had more leisure time than ever before. This resulted in the need for organized entertainment. Suitable games developed or were invented, typically team games, in which the crowd could (4) ______ sides and become involved. This gave people some of the entertainment they need in their free time. The recent explosion in TV, with the introduction of satellite and cable channels, has caused an increase in (5) ______ for sports as entertainment. The money TV has brought to games such as football, tennis and baseball means that spectator sports will certainly go on playing an important part in our lives.  

Question 3:

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 1 to 5:

A surprising number of popular spectator sports, for example football or baseball, (1)______ in Europe or the USA in the nineteenth century. This did not happen by chance. It was the (2) ______ of changes in the way people lived in those places at that time. Until then, more people lived in the country than in towns. They worked in small groups and had no regular time off. All this changed with the growth of factories and industry in the nineteenth century, first in Europe and (3) ______ in the USA. For the first time, most people began to live in towns, and they found themselves with regular free time. They had more leisure time than ever before. This resulted in the need for organized entertainment. Suitable games developed or were invented, typically team games, in which the crowd could (4) ______ sides and become involved. This gave people some of the entertainment they need in their free time. The recent explosion in TV, with the introduction of satellite and cable channels, has caused an increase in (5) ______ for sports as entertainment. The money TV has brought to games such as football, tennis and baseball means that spectator sports will certainly go on playing an important part in our lives.  

Question 4: