Hợp chất hữu cơ X có tên gọi là: 2-clo-3-metylpentan. Công thức cấu tạo của X là:

A. CH₃CH₂CH(Cl)CH(CH₃)₂

B. CH₃CH₂CH(CH₃)CH₂CH₂Cl

C. CH₃CH(Cl)CH₃CH(CH₃)CH₃

D. CH₃CH(Cl)CH(CH₃)CH₂CH₃

Cho 10,08 lít (đktc) hỗn hợp khí X gồm C₂H₂ và H₂ đi qua ống chứa xúc tác Ni, nung nóng thu được hỗn hợp Y chỉ chứa 3 hiđrocacbon. Tỉ khối của Y so với He là 7,125. Tính phần trăm thể tích của C₂H₂ trong hỗn hợp X:

A. 62,25%

B. 45,55%

C. 36,73%

D. 44,44%

VIII/ 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 following questions from 56 to 65.

Psychologists have debated a long time about whether a child’s upbringing can give it the ability to do outstandingly well. Some think that it is impossible to develop genius and say that it is simply something a person is born with. Others, however, argue that the potential for great achievement can be develop. The truth lies somewhere between these two extremes.

It seems very obvious that being born with the right qualities from gifted parents will increase a child’s ability to do well. However, this ability will be fully realized only with the right upbringing and opportunities. As one psychologist says, “To have a fast car, you need both a good engine and fuel.”

Scientists have recently assessed intelligence, achievement, and ability in 50 sets of identical twins that were separated shortly birth and brought up by different parents. They found that achievement was based on intelligence, and later influenced by the child’s environment.

One case involving very intelligent twins was quoted. One of the twins received a normal upbringing, and performed well. The other twin, however, was brought up by extremely supportive parents and given every possible opportunity to develop its abilities. That twin, though starting out with the same degree of intelligence as the other, performed even better.

This case reflects the general principle of intelligence and ability. The more favorable the environment, the more a child’s intelligence and ability are developed. However, there is no link between intelligence and socioeconomic level of a child’s family. In other words, it does not matter how poor or how rich a family is, as this does not affect the intelligence.

Gifted people can not be created by supportive parents, but they can be developed by them. One professor of music said that outstanding musicians usually started two or three years earlier than ordinary performers, often because their parents had recognized their ability. These musicians then needed at least ten years’ hard work and training in order to reach the level they were capable of attaining.

People who want to have very gifted children are given the following advice:

-     Marry an intelligent person.

-     Allow children to follow their own interests rather than the interests of the parents.

-     Start a child’s education early but avoid pushing the child too hard.

-      Encourage children to play; for example, playing with musical instrument is essential for a child who wants to become an outstanding musician.

How were great musicians different from ordinary musicians in their development? 

A. They practice playing their instruments for many years 

B. They were exceptionally intelligent and artistic 

C. They concentrated on music to the exclusion of other areas 

D. Their ability was realized at an early stage and then nurtured

Dung dịch nào sau đây làm quỳ tím đổi thành màu xanh ?

A. Dung dịch lysin

B. Dung dịch alanin

C. Dung dịch glyxin

D. Dung dịch valin

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 34 to 41

     Overpopulation, the situation of having large numbers of people with too few resources and too little space, is closely associated with poverty. It can result from high population density, or from low amounts of resources, or from both. Excessively high population densities put stress on available resources. Only a certain number of people can be supported on a given area of land, and that number depends on how much food and other resources the land can provide. In countries where people live primarily by means of simple farming, gardening, herding, hunting, and gathering, even large areas of land can support only small numbers of people because these labor - intensive subsistence activities produce only small amounts of foo.

In developed countries such as the United States, Japan and the countries of Western Europe, overpopulation generally is not considered a major cause of poverty. These countries produce large quantities of food through mechanized farming, which depends on commercial fertilizers, large - scale irrigation, and agricultural machinery. This form of production provides enough food to support the high densities of people in metropolitan areas.

A country's level of poverty can depend greatly on its mix of population density and agricultural productivity. Bangladesh, for example, has one of the world's highest population densities, with 1,147 persons per sq km. A large majority of the people of Bangladesh engage in low - productivity manual farming, which contributes to the country's extremely high level of poverty. Some of the smaller countries in Western Europe, such as the Netherlands and Belgium, have high population densities as well. These countries practice mechanized farming and are involved in high - tech indutries, therefore, they have high standards of living.

At the other end of the spectrum, many countries in sub - Saharan Africa have population densities of less than 30 persons per sq km. Many people in these countries practice manual subsistence farming, these countries also have infertile land, and lack the economic resources and technology to boost productivity. As a consequence, these nations are very poor. The United States has both relatively low population density and high agricultural productivity; it is one of the world's weathiest nations.

High birth rates contribute to overpopulation in many developing countries. Children are asset to many poor families because they provide labor, usually for farming. Cultural norms in traditionally rural societies commonly sanction the value of large families. Also, the goverments of developing countries often provide little or no support, financial or political, for farming planning; even people who wish to keep their families small have difficulty doing so. For all those reasons, developing countries tend to have high rates of population growth.

What will suffer when there are excessively high population densities?

A. Available resources

B. Skilled labor

C. Land area

D. Farming methods

VII/ 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 following questions from 46 to 55.

The White House, the official home of the United States president, was not built in time for George Washington to live in it. It was begun in 1792 and was ready for its first inhabitants. President and Mrs. John Adams, who moved in on November 1, 1800. When the Adams moved in, the White House was not yet complete, and the Adams suffered many inconveniences; for example, the main staircase was incomplete, which hindered movement from floor to floor, and the future laundry yard was merely a pool of mud, so wet laundry was hung in the unfinished East Room to dry. Thomas Jefferson, the third president, improved the comfort of the White House in many respects and added new architectural features such as the terraces on the east and west ends.

When the British forces burned the White House on August 24, 1814, President Madison was forced to leave. All the remained after the fire was the exterior walls, the interior was completely destroyed. It was not until December of that the following president, James Monroe, was able to move into a rebuilt residence. Since then, the White House has continued to be modified but has been continuously occupied by each succeeding U.S president.

According to the passage, when James Monroe came to the White House, it had been x . 

A. repressed

B. reconstructed

C. relocated

D. reserved

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

My friend lives in a (n)_____warehouse in a very fashionable part of town.

A. transformed

B. altered

C. changed

D. converted

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

Near the White House is another famous landmark x the Washington Monument.

A. which called

B. called

C. which calls

D.  calling

Tripeptit mạch hở X và đipeptit mạch hở Y đều được tạo nên từ một α–amino axit (no, mạch hở, trong phân tử chỉ chứa một nhóm –NH₂ và một nhóm –COOH). Đốt cháy hoàn toàn 0,1 mol Y thu được tổng khối lượng CO₂ và H₂O bằng 24,8 gam. Đốt cháy hoàn toàn 0,1 mol X, sản phẩm thu được hấp thụ vào dung dịch Ca(OH)₂ dư, sau phản ứng khối lượng dung dịch này 

A. giảm 32,7 gam

B. giảm 27,3 gam

C. giảm 23,7

D. giảm 37,2 gam

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

Baseball evolved from a number of different ball-and stick games (paddle ball, trap ball, one-old-cat, rounders, and town ball) originating in England. As early as the American Revolution. It was noted that troops played “baseball” in their free time. In 1845 Alexander Cartwright formalized the New York Knickerbockers’ version of the game: a diamond shaped infield, with bases ninety feet apart, three strikers - you’re - out , batter out on a caught ball , three outs per inning , a nine man team. “The New York Game” spread rapidly , replacing earlier localized forms. From its beginnings, baseball was seen as a way of satisfying the recreational needs of an increasingly urban - industrial society. At its inception it was it was played by and for gentlemen. A club might consists of 40 members. The president would appoint two captains who would choose teams from among the members. Games were played on Monday and Thursday afternoons, with the losers often providing a lavish evening’s entertainments for the winners

During the 1850- 70 period the game was changing, however, with increasing commercialism (charging admission), under - the - table payments to exceptional to players, and gambling on the outcome of games. By 1868 it was said that a club would have their regular professional ten, an amateur first - nine , and their” muffins “ (the gently duffers who once ran the game) . Beginning with the first openly all - salaried team (Cincinnati’s Red Stocking Club) in 1869, the 1870- 1890 period saw the complete professionalization of baseball, including formation of the National Association of Professional baseball players in 1871. The National League of Professional Baseball Clubs was formed in 1876, run by business- minded invertors in joint-stock company clubs. The 1880s has been called Major League BasebalTs “Golden Age”. Profits soared, player’s salaries rose somewhat, a season of 84 games became one of 132, a weekly periodical “ The sporting News” came into being, wooden stadiums with double-deck stands replaced open ííelds, and the standard refreshment became hot dogs, soda pop and peanuts. In 1900 the Western League based in the growing cities of the Mid-west proclaimed itself the American League.

Question:Which of the following is true of the way the game was played by wealthy gentlemen at its inception?

A.  a team might consist of 40 members

B.  the president would choose teams from among the members

C.  they didn’t play on weekend

D.  they might be called “duffers” if they didn’t make the first nine