Chia bột kim loại X thành 2 phần. Phần một cho tác dụng với C l 2  tạo ra muối Y. Phần hai cho tác dụng với dung dịch HCl tạo ra muối Z. Cho kim loại X tác dụng với muối Y lại thu được muối Z. Kim loại X có thề là

A. Mg

B. Al

C. Zn

D. Fe

Trên hình bên có vẽ một số đường sức của hệ thống hai điện tích điểm A và B. Chọn kết luận đúng

A. A là điện tích dương, B là điện tích âm.

B. A là điện tích âm, B là điện tích dương.

C. Cả A và B là điện tích dương.

D. Cả A và B là điện tích âm.

Những đường sức điện nào vẽ ở hình dưới là đường sức của điện trường đều?

A. Hình 1.

B. Hình 2.

C. Hình 3.

D. không hình nào.

Choose the letter A, B, C or D to answer these following questions

Nature gave us all necessary resources to live and prosper. Now it is in danger and needs our help. What else we can do to protect environment? First of all this decisions must be made on governmental level and provide legal limitations for industries that emit a lot of greenhouse gases. We must unite together in order to protect the place we live in. People are an integral part of nature, we are dependent of it as we cannot imagine our life without nature. So why to destroy environment and bite the hand that feeds you? We must stop deforestation and plant trees on cut down areas. Trees are natural filter of air that absorb carbon dioxide and produce oxygen. Cutting down trees we deprive animals of their natural environment and the soil begin to grow in erosion. Planting trees will save birds and other animals.

We often make forced choices that are advertised on TV. Manufacturers try to rise their profits and sell more products. Sometimes we have so many unnecessary things we do not use. Imagine that you are moving your house, what are the necessary items you may need to live, only several bags. In reality the matter is opposite. There are a lot of things we do not use. People have to reconsider their views of life and promote healthy and ecologically friendly lifestyle. It is up to us to change situation for better and leave good legacy for generations to come.

Question: Are we dependent on nature?

A. Yes we are

B. No, we’re not

Read the passage below and decide whether the statements are TRUE or FALSE?

We are all around computers. Computers play an important play in our day to day lives, like we are very much dependent them for doing many things including giving users the ability to quickly and easily store and process data. Since the invention of computer they have evolved in terms of increased computing power and decreased size. Computers are used in many sectors like Education, Health and Medicine, Financial Institutions, Transport System, E-Commerce, Defence etc.

Computers connect us to the world of unknown. They help us gathering knowledge and huge information from the internet and storing it. Computers are multitasking and accurate enough to be used almost anywhere and everywhere including banks. Computer provide security from destructive forces and from unwanted action from unauthorized users like cyber attack or access attack.

Now computer is not just a calculating device, it has become much more than that. One of the main advantages of computer is its incredible speed, which helps human to complete their task in few seconds. All the operations can be performed very fast just because of its speed else wise it takes a long time to perform the task.

Question: Banks use computers because they’re multitasking and accurate.

A. True

B. False