Reports are coming in of a major oil spill in ______ Mediterranean

A. an 

B. ø 

C. the 

D. a 

I didn't like the town at first, but I grew _____ it eventually

A. loving 

B. to be loved 

C. to love 

D. to be loving 

Cho các chất đơn chức có công thức phân tử C₃H₆O₂ lần lượt phản ứng với Na, NaO, NaHCO₃. Số phản ứng xảy ra là:

A. 4.

B. 6.

C. 3.

D. 5.

Cho các phản ứng sau:

MnO₂ + HCl (đặc) → t o  Khí X + .... (1)       Na₂SO₃ + H₂SO₄ (đặc)  → t o  Khí Y + .... (2)

NH₄Cl + NaOH  → t o  Khí Z + .... (3)           NaCl (r) + H₂SO₄ (đặc)  → t o  Khí G + .... (4)

Cu + HNO₃ (đặc)  → t o  Khí E + .... (5)         FeS + HCl   → t o  Khí F + .... (6)

Những khí tác dụng đục với NaOH (trong dung dịch) ở điều kiện thường là:

A. X, Y, Z, G.

B. X, Y, G.

C. X, Y, G, E, F.

D. X, Y, Z, G, E ,F.

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 the passage, most advertising used to be directed at ___________.

A. working mothers with children 

B. older adults 

C. unmarried people 

D. two-parent families with children 

Có 5 lọ hóa chất không nhãn mỗi lọ đựng một trong các dung dịch sau đây (nồng độ khoảng 0,1M): NH4Cl, FeCl2, AlCl3, MgCl2, CuCl2. Chỉ dùng dung dịch NaOH thêm vào từng dung dịch có thể nhận biết dãy dung dịch nào sau đây?

A. 2 dung dịch : NH4Cl, CuCl2

B. 3 dung dịch : NH4Cl, MgCl2, CuCl2

C. 4 dung dịch: NH4Cl, AlCl3, MgCl2, CuCl2

D. cả 5 dung dịch.