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

Diet and Exercise

Many people seem to believe that there is a magic diet formula that will guarantee weight loss. This is a fallacy. Most fad diet, if followed conscientiously, will result in weight loss due to the reduction in calories. However, they are nearly always too monotonous and sometimes too unhealthy to be followed in the long term. Worse, fad dieters who don't become physically active and learn to eat sensibly will eventually regain the weight they lost, and often even more.

          Some of the most popular fad diets in recent years have been low-carbohydrate programs, which work by making the body produce ketones. Ketones are normal and efficient source of energy for the human body. When the intake of carbohydrates is severely restricted, body fats are broken down into fatty acids that can be used as fuel. The fatty acids may be incompletely metabolized, yielding ketones. When your body is producing ketones, and using them as fuel, this is called ketosis. Most diets based on ketosis do not limit the consumption of protein, fat, or total calories. As a result, their fat content tends to be very high. Promoters claim that ketosis will lead to increased metabolism of unwanted fat, even if the calories are not reduced. This is not entirely true; calorie reduction is likely to occur because of the diet's lack of appealing foods. This is not conductive to forming sensible eating habits.

          The most widely used low-carbohydrate diet is the one advocated by the late Robert Atkins M.D, of New York City. Under the Atkins program, the dieter is permitted to eat unlimited amounts of non-carbohydrate foods "when hungry". The American Medical Association and many individual experts have warned that the unlimited intake of saturated fat under Atkins food plan can increase the dieter's risk of heart disease. In 2000, researchers at the University of Kentucky did a computer analysis of a week's worth of sample menus and reported several alarming findings: the diet contained 59% fat; it provided fewer servings of grains, vegetables, and fruits than recommended by most nutritionists, and while it can produce short-term weight loss, long-term use is likely to increase the risk of both cardiovascular disease and cancer. The weight loss usually doesn't last, either. As ketosis begins, weight will be shed quickly, giving the misleading impression that significant fat reduction is taking place. In fact, most of the weight loss is water rather than fat; the lost water is regained quickly when a normal diet is resumed. Appetite, which is often reduced during ketosis, also returns.

          Atkins advocated his diet for more than 30 years and claimed that more than 60,000 patients treated at his centre had used his diet as their primary protocol for losing weight. Yet he never published any study in which people who used this program were monitored over a period of several years. Besides the dubiousness of its effects in the long term, the Atkins diet shares another shortcoming of all fad diets: inflexibility. People are different, with different health problems and genetic characteristics, and no single diet is right for everyone.

          An additional downside to the recent craze for low-carbohydrate diets is that it has encouraged food companies to market low-carbohydrate foods for people who want to "watch their carbs". Most of these foods are much higher in fat than the foods they are designed to replace. "Low-carb” advertising is encouraging both dieters and non-dieters to eat high-fat foods, which is exactly the opposite of medical and nutrition authorities have been arguing for decades. Following a low-carbohydrate diet under medical supervision may make sense for some people, but a population-wide increase in fat consumption would be a public health disaster

It can be inferred that the author’s biggest objection to Atkins diet is that ______

A. it has led to “low-carb” advertising

B. (s)he believes it causes cancer

C. it leads to higher fat consumptions

D. it has not been thoroughly studied

Một huấn luyện viên cho cầu thủ tập sút bóng vào cầu môn PQ. Bóng được đặt ở các vị trí A, B, C trên một cung tròn như hình 20.

Hãy so sánh các góc  P A Q ^ ; P B Q ^ ; P C D ^

Read the passage and choose the best answer for each question below.

          By far the most important United States export product in the eighteenth and nineteenth centuries was cotton, favored by the European textile industry over flax or wool because it was easy to process and soft to tile touch. Mechanization of spinning and weaving allowed significant centralization and expansion in the textile industry during

this period, and at the same time the demand for cotton increased dramatically. American producers were able to meet this demand largely because of tile invention of the cotton gin by Eli Whitney in 1793. Cotton could be grown throughout the South, but separating the fiber – or lint – from the seed was a laborious process. Sea island cotton was relatively easy to process by hand, because its fibers were long and seeds were concentrated at the base of the flower, but it demanded a long growing season, available only along the nation's eastern seacoast. Short-staple cotton required a much shorter growing season, but the shortness of the fibers and their mixture with seeds meant that a worker could

hand-process only about one pound per day. Whitney's gin was a hand-powered machine with revolving drums and metal teeth to pull cotton fibers away from seeds. Using the gin, a worker could produce up to 50 pounds of lint a day.   The later development of larger gins, powered by horses, water, or steam, multiplied productivity further.

          The interaction of improved processing and high demand led to the rapid spread of the cultivation of cotton and to a surge in production. It became the main American export, dwarfing all others. In 1802, cotton composed 14 percent of total American exports by value. Cotton had a 36 percent share by 1810 and over a 50 percent share

in 1830. In 1860, 61 percent of the value of American exports was represented by cotton. In contrast, wheat and wheat flour composed only 6 percent of the value of American exports in that year. Clearly, cotton was king in the trade of the young republic. The growing market for cotton and other American agricultural products led to an unprecedented expansion of agricultural settlement, mostly in the eastern half of the United States---west of the Appalachian Mountains and east of the Mississippi River.

The word "unprecedented" in line 18 is closest in meaning to

A. slow

B. profitable

C. not seen before

D. never explained

Cho sơ đồ chuyển hóa sau (mỗi mũi tên là một phương trình phản ứng):

Tinh bột → X → Y → Z → metyl axetat. Các chất Y, Z trong sơ đồ trên lần lượt là

A.  CH 3 COOH , CH 3 OH

B.  C 2 H 4 , CH 3 COOH

C.  C 2 H 5 OH ,   CH 3 COOH

D.  CH 3 COOH ,   C 2 H 5 OH

Cho các phát biểu sau

(a) Glucozơ được gọi là đường nho do có nhiều trong quả nho chín.

(b) Chất béo là đieste của glixerol với axit béo

(c) Phân tử amilopectin có cấu trúc mạch phân nhánh

(d) Ở nhiệt độ thường, triolein ở trạng thái rắn

(e) Trong mật ong chứa nhiều fructozơ

(f) Tinh bột là một trong những lương thực cơ bản của con người

Số phát biểu đúng là

A. 4

B. 6.

C. 5

D. 3

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

The Golden Gate, painting(A)  a bright red-orange called(B)  "International Orange", requires repainting(C)  every year because of(D)  the salty, corrosive air.

A. painting

B. called

C. repainting

D. because of(

Choose the best option A, B, C or D to complete each of the sentences from 21 to 39.

In some countries, on moral ______ that education should not be taxed, there is no tax on books.

A. idea

B. principle

C. reason

D. concept

Read the following passage 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.

OWNING A PET

The joys and tribulations of being a pet owner! During our lifetime most of us have some experience of either owning a pet or being in (26) _______ contact with someone who does. Is there such a thing as “the ideal pet”? If so what characterizes the ideal pet? Various (27) _______ influence one’s choice of pet, from your reasons for getting a pet to your lifestyle. For example, although quite a few pets are relatively cheap to buy, the cost of (28) _______ can be considerable. Everything must be (29) _______ into account, from food and bedding, to vaccinations and veterinary bills. You must be prepared to (30) _______ time on your pet, which involves shopping for it, cleaning and feeding it. Pets can be demanding and a big responsibility. Are you prepared to exercise and (31) _______ an animal or do you prefer a more independent pet? How much spare room do you have? Is it right to lock an energetic animal into a (32) _______ space? Do you live near a busy road which may threaten the life of your pet? Pets (33) _______ as turtles and goldfish can be cheap and convenient, but if you prefer affectionate pets, a friendly cat or dog would be more (34) _______. People get pets for a number of reasons, for company, security or to teach responsibility to children. Pets can be affectionate and loyal and an excellent source of company as long as you know what pet (35) _______ you and your lifestyle.

Điền vào ô 32

A. reduced                     

B. detained           

C. closed             

D. confined

Choose the best option A, B, C or D to complete each of the sentences from 21 to 39.

You ______ take your umbrella along with you today. The weatherman on the news said there's a storm north of here and it ______ rain later on this afternoon.

A. might / can

B. must / may

C. should / might

D. should / must

Read the following passage and choose the letter A, B, C or D to indicate the correct answer to each of the questions from 11 to 20.

Although speech is generally accepted as the most advanced form of communication, there are many ways of communicating without using words. In every known culture, signals, signs, symbols, and gestures are commonly utilized as instruments of communication. There is a great deal of agreement among communication scientists as to what each of these methods is and how each differs from the others. For instance, the basic function of any signal is to impinge upon the environment in such a way that it attracts attention, as, for example, the dots and dashes that can be applied in a telegraph circuit. Coded to refer to speech, the potential for communication through these dots and dashes—short and long intervals as the circuit is broken—is very great. Less adaptable to the codification of words, signs also contain agreed upon meaning; that is, they convey information in and of themselves. Two examples are the hexagonal red sign that conveys the meaning of stop, and the red and white swirled pole outside a shop that communicates the meaning of barber.

Symbols are more difficult to describe than either signals or signs because of their intricate relationship with the receiver’s culture perceptions. In some cultures, applauding in a theater provides performers with an auditory symbol of approval. In other cultures, if done in unison, applauding can be a symbol of the audience’s discontent with the performance. Gestures such as weaving and handshaking also communicate certain culture messages.

Although signals, signs, symbols, and gestures are very useful, they also have a major disadvantage in communication. They usually do not allow ideas to be shared without the sender being directly adjacent to the receiver. Without an exchange of ideas, interaction comes to a halt. As a result, means of communication intended to be used across long distances and extended periods must be based upon speech. To radio, television, and the telephone, one must add fax, paging systems, electronic mail, and the internet, and no one doubts but that there are more means of communication on the horizon.

sentence in paragraph 1 defines the function of a signal?

A. Sentence 2

B. Sentence 3

C. Sentence 1

D. Sentence 4