Đưa các phương trình sau về dạng ax2 + 2b'x + c = 0 và giải chúng. Sau đó, dùng bảng số hoặc máy tính để viết gần đúng nghiệm tìm được (làm tròn kết quả đến chữ số thập phân thứ hai):

3x2 – 2x = x2 + 3

Mark the letter A, B, C, or D on your answer sheet to indicate the word or phrase that is CLOSEST in meaning to the underlined part in each of the following.

Whenever problems come up, we discuss them frankly and find solutions quickly.

A. clean

B. encounter

C. arrive

D. happen

Read the passage and choose the best option to complete each of the blanks

PROBLEMS OF WATCHING TELEVISION IN BRITAIN

British parents are always complaining that their children spend too much time gluing to the telly and not enough (37)____ other activities like sports and reading. A survey recently carried out on people's viewing habits (38)____ not disapprove it. It shows that young people in Britain spend on (39)___ twenty three hours a week in front of the television, (40)_______ works out at over three hours every day.

What is surprising, however, is the fact that the average adult watches even more: an incredible 28 hours a week. We seem to have become a nation of telly addicts. Just about (41)_______ household in the country has a television and over half have two or more. According (42)___ the survey, people nowadays don't just watch television sitting in their living room, they watch it in the kitchen and in bed as well.

          The Education Minister said a (43)___weeks ago that Britain's pupils should spend more time reading. Unfortunately, parents are not setting a good example: adults do (44)__ reading than young people. In fact, reading is (45)___ the bottom of their list of favorite pastimes. They would (46)____ listen to the radio, go to the cinema or hire a video to watch on their television at home.

ĐIền vào ô 42

A. to                    

B. on                              

C. for                             

D. with

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.

 A number of factors related to the voice reveal the personality of the speaker.

The first is the broad area of communication, which includes imparting information by use of language, communicating with a group or an individual and specialized communication through performance. A person conveys thoughts and ideas through choice of words, by a tone of voice that is pleasant or unpleasant, gentle or harsh, by the rhythm that is inherent within the language itself, and by speech rhythms that are flowing and regular or uneven and hesitant, and finally, by the pitch and melody of the utterance. When speaking before a group, a person's tone may indicate uncertainty or fright, confidence or calm. At interpersonal levels, the tone may reflect ideas and feelings over and above the words chosen, or may belie them. Here the participant’s tone can consciously or unconsciously reflect intuitive sympathy or antipathy, lack of concern or interest, fatigue, anxiety, enthusiasm or excitement, all of which are usually discernible by the acute listener. Public performance is a manner of communication that is highly specialized with its own techniques for obtaining effects by voice and /or gesture. The motivation derived from the text, and in the case of singing, the music, in combination with the performer's skills, personality, and ability to create empathy will determine the success of artistic, political, or pedagogic communication.

   Second, the voice gives psychological clues to a person's self-image, perception of others, and emotional health. Self-image can be indicated by a tone of voice that is confident, pretentious, shy, aggressive, outgoing, or exuberant, to name only a few personality traits. Also the sound may give a clue to the facade or mask of that person, for example, a shy person hiding behind an overconfident front. How a speaker perceives the listener's receptiveness, interest, or sympathy in any given conversation can drastically alter the tone of presentation, by encouraging or discouraging the speaker. Emotional health is evidenced in the voice by free and melodic sounds of the happy, by constricted and harsh sound of the angry, and by dull and lethargic qualities of the depressed.

The word "evidenced" in line 22 is closest in meaning to _____ .

A. questioned 

B. repeated

C. indicated

D. exaggerated

Read the following passage and then choose the best answer A, B, C or D.

          Glass is a remarkable substance made from simplest raw materials. It can be colored or colorless, monochrome or polychrome, transparent, translucent or opaque. It is lightweight impermeable to liquids, readily cleaned and reused, durable yet fragile, and often very beautiful. Glass can be decorated in multiple ways and its optical properties are exceptional. In all its myriad forms-as table ware, containers, in architecture and design-glass represents a major achievement in the history of technological developments.

          Since the Bronze Age about 3,000 B.C, glass has been used for making various kinds of objects. It was first made from a mixture of silica, line and an alkali such as soda or potash, and these remained the basic ingredients of glass until the development of lead glass in the seventeenth century. When heated, the mixture becomes soft, and malleable and can be formed by various techniques into a vast array of shapes and sizes. The homogeneous mass is thus formed by melting then cooling to create glass, but in contrast to most materials formed in this way (metals, for instance), glass lacks the crystalline structure normally associated with solids, and instead retains the random molecular structure of a liquid. In effect, as molten glass cools, it progressively stiffens until rigid, but does so without setting up a network of interlocking crystals customarily associated with that process. This is why glass shatters so easily when dealt a blow, why glass deteriorates over time, especially when exposed to moisture, and why glassware must be slowly reheated and uniformly cooled after manufacture to release internal stresses induced by uneven cooling.

Another unusual feature of glass is the manner in which its viscosity changes as it turns from a cold substance into a hot, ductile liquid. Unlike metals that flow or “freeze” at specific temperatures, glass progressively softens as the temperature rises, going through varying stages of malleability until it flows like a thick syrup. Each stage of malleability allows the glass to be manipulated into various forms, by different techniques, and if suddenly cooled the object retains the stage achieved at that point. Glass is thus amenable to a greater number of heat-forming techniques than most other materials.

What must be done to release the internal stresses that build up in glass products during manufacture?

A. The glass must be cooled quickly

B. The glass must be reheated and evenly cooled

C. The glass must be kept moist until cooled

D. The glass must be shaped to its desired form immediately

....with...

Dung dịch chứa chất nào sau đây có thể dùng để tách Ag ra khỏi hỗn hợp Ag, Cu, Fe ở dạng bột mà không làm thay đổi khối lượng Ag?

A. Hg(NO₃)₂

B. Fe(NO₃)₃

C. AgNO₃

D. HNO₃