Đốt cháy hoàn toàn 3,42 gam hỗn hợp gồm axit acrylic, vinyl axetat, metyl acrylat và axit oleic, rồi hấp thụ toàn bộ sản phẩm cháy vào dung dịch Ca(OH)₂ (dư). Sau phản ứng thu được 18 gam kết tủa và dung dịch X. Khối lượng X so với khối lượng dung dịch Ca(OH)₂ ban đầu đã thay đổi như thế nào?

A. Tăng khoảng 2,75 gam.

B. Giảm khoảng 7,75 gam.

C. Tăng khoảng 7,95 gam

D. Giảm khoảng 7,35 gam

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 15 to 22.

[1] Advertising helps people recognize a particular brand, persuades them to try it, and tries to keep them loyal to it. Brand loyalty is perhaps the most important goal of consumer advertising. Whether they produce cars, canned foods or cosmetics, manufacturers want their customers to make repeated purchases. [2] The quality of the product will encourage this, of course, but so, too, will affect advertising.

Advertising relies on the techniques of market research to identify potential users of a product. [3] Are they homemakers or professional people? Are they young or old? Are they city dwellers or country dwellers? Such questions have a bearing on where and when ads should be placed. By studying readership breakdowns for newspapers and magazines as well as television ratings and other statistics, an advertising agency can decide on the best way of reaching potential buyers. Detailed research and marketing expertise are essential today when advertising budgets can run into thousands of millions of dollars. [4]

Advertising is a fast-paced, high-pressure industry. There is a constant need for creative ideas that will establish a personality for a product in the public's mind. Current developments in advertising increase the need for talented workers.

In the past, the majority of advertising was aimed at the traditional white family - breadwinner father, non-working mother, and two children. Research now reveals that only about 6 percent of American households fit this stereotype. Instead, society is fragmented into many groups, with working mothers, single people and older people on the rise. To be most successful, advertising must identify a particular segment and aim its message toward that group.

Advertising is also making use of new technologies. Computer graphics are used to grab the attention of consumers and to help them see products in a new light. The use of computer graphics in a commercial for canned goods, for instance, gave a new image to the tin can. 

According to paragraph 2, market research includes ___________.

A. searching for talented workers 

B. hiring researchers with background in many fields 

C. studying television ratings 

D. determining the price of a product 

Có ai còn nhớ mình không nhỉ
H chẳng học ở Học 24 được nữa nên mình cx chả hiểu tình tình
Nhưng nay giành time để ủng hộ cho bài của @Đức Minh

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

007 didn’t need _________ out of his room in Moscow.

A. go

B. to going

C. going

D. to go

Nhỏ từ từ dung dịch Ba(OH)₂ 0,5M vào ống nghiệm chứa dung dịch Al₂(SO₄)₃. Đồ thị biểu diễn sự phụ thuộc khối lượng kết tủa theo thể tích dung dịch Ba(OH)₂ như sau:

Giá trị của V₂ : V₁ nào sau đây là đúng?

A. 7:6.         

B. 4:3.       

C. 6:5.           

D. 5:4.

Read the following passage and choose the letter A, B, C or D to indicate the correct answer to each of the questions from 35 to 42.

In the USA, the UK and many other countries, a lot of babies were born in the “baby boom” of the late 1940s and 1950s; after that the birth-rate fell. Baby boomers have now retired, or are approaching retirement, and this is causing headaches for many organizations: there are not enough people to succeed their top managers when they retire.

Does your organization have key staff who can’t easily be replaced? A CEO or financial director, perhaps, or a technical expert with knowledge that nobody else in the organization has. If your answer is “yes”, what will happen when they retire, or leave for another company? Will you wait until the last moment before looking for someone to replace them? Or is your organization thinking about likely future changes now, as it should be, and making plans, so that there is likely to be someone ready to replace the person leaving? If the answer is that you are planning ahead, your organization is carrying out succession planning.

Succession planning means looking inside the organization for “high-fliers” - current staff members with the potential to fill key positions - and planning the training, responsibilities and promotion they need, to make them ready when a senior vacancy occurs - which may not be for several years. The company benefits by being able to make an internal promotion when a key person leaves, and in the meantime it benefits by developing the skills of its high-fliers and encouraging them to stay. And the high-fliers benefit, because they achieve their full potential, a career is planned for them within the organization, and they can look forward to a senior post in time.

The training program planned for the high-fliers will help them to develop the leadership skills they need for more senior roles, skills such as planning long-term strategies. A career path is also planned, so that each high-flier moves into a number of different positions over a few years, to gain the experience and know ledge they need.

Sometimes a staff member is chosen as a potential successor to a particular senior manager, but a better method is for organizations to select a number of high-fliers, and prepare them for a range of senior roles. An organization can’t be certain when a particular senior manager will leave. Having a group of people being prepared fee top positions makes it easier to replace someone who leaves unexpectedly, and also means that there are other people available if a high-flier leaves the company.

What does the word “them” in the 3rd paragraph refer to?

A. high-fliers

B. key positions

C. responsibilities

D. organizations

Anion gốc axit nào sau đây có thể làm mềm nước cứng?

A. SO₄^2-.     

B. PO₄^3-.     

C. NO₃^-.      

D. ClO₄^-

Sự lãnh đạo kịp thời, sáng tạo của Đảng Cộng sản Đông Dương và của lãnh tụ Hồ Chí Minh trong Cách mạng tháng Tám thể hiện ở những điểm nào?