The disavantaged should be cared for by _______.

A. the wealth

B. wealth

C. the wealthy

D. wealthier

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.

What picture do you have of the future? Will life in the future be better, worse or the same as now? What do you hope about the future?

Futurologists predict that life will probably be very different in 2050 in all the fields, from entertainment to technology. First of all, it seems that TV channels will have disappeared. Instead, people will choose a program from a 'menu' and a computer will send the program directly to the television. Today, we can use the World Wide Web to read newspaper stories and see pictures on a computer thousands of kilometers away. By 2050, music, films, programs, newspapers and books will come to us by computer.

In what concerns the environment, water will have become one of our most serious problems. In many places, agriculture is changing and farmers are growing fruit and vegetables to export. This uses a lot of water. Demand for water will increase ten times between now and 2050 and there could be serious shortages. Some futurologists predict that water could be the cause of war if we don't act now.

In transport, cars running on new, clean fuels will have computers to control the speed and there won't be any accidents. Today, many cars have computers that tell drivers exactly where they are. By 2050, the computer will control the car and drive it to your destination. On the other hand, space planes will take people halfway around the world in two hours. Nowadays, the United States Shuttle can go into space and land on Earth again. By 2050, space planes will fly all over the world and people will fly from Los Angeles to Tokyo in just two hours.

In the domain of technology, robots will have replaced people in factories. Many factories already use robots. Big companies prefer robots - they do not ask for pay rises or go on strike, and they work 24 hours a day. By 2050, we will see robots everywhere - in factories, schools, offices, hospitals, shops and homes.

Last but not least, medicine technology will have conquered many diseases. Today, there are electronic devices that connect directly to the brain to help people hear. By 2050, we will be able to help blind and deaf people see and hear again. Scientists have discovered how to control genes. They have already produced clones of animals. By 2050, scientists will be able to produce clones of people and decide how they look, how they behave and how much intelligence they have. 

What can be inferred about the life in 2050 according to the passage?

A. Life in 2050 will be much better than that of today

B. TV will be an indispensable means of communication and business.

C. People will not suffer from the shortage of water due to the polar melting. 

D. The deaf will not have to depend any longer on the electronic hearing devices

Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction in each of the following questions.
Hardly did he enter the room when all the lights went out.

A. did he enter

B. when

C. the lights

D. went

a) Tính

Theo công thức tính tổng : S = 1+2+3+....+n= ( \(\dfrac{n.\left(n+1\right)}{2}\)

\(\Rightarrow S=1+3+5+.....+2009+2011=1+2+3+...+2010+2011-\left(2+4+6+...+2010\right)\)= \(1+2+3+...+2010+2011-2\left(1005.\dfrac{1006}{2}\right)=1012036\)

b) Chứng tỏ S là một số chính phương.

\(1012036\) có tận cùng bằng 6 và 1012036 = 2².503² ( số mũ chẵn ) , 1012036 = 1006²

\(\Rightarrow1012036\) là số chính phương .

Tìm x :

\(\sqrt{x+3}=\sqrt{5-x}\)

\(\Leftrightarrow x+3=5-x\)

\(\Leftrightarrow2x=2\)

\(\Leftrightarrow x=1\)

Vậy x = 1

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 35 to 42.

Life in the Universe

    Exobiology is the study of life that originates from outside of Earth. As yet, of course, no such a life forms have been found. Exobiologists, however, have done important work in the theoretical study of where life is most likely to evolve, and what those extraterrestrial life forms might be like.

What sorts of planets are most likely to develop life? Most scientists likely to agree that a habitable planet must be terrestrial, or rock-based, with liquid surface water and biogeochemical cycles that somewhat resemble the continuous movement ands transformation of materials in the environment. These cycles include the circulation of elements and nutrients upon which life and the Earth’climate depend. Since (as far as we know) all life is carbon-based, a stable carbon cycle is especially important.

The habitable zone is the region around a star in which planets can develop life. Assuming the need for liquid surface water, it follows that most stars around the size of our sun will be able to sustain habitable zones for billions of years. Stars that are larger than the sun are much hotter and burn out more quickly; life there may not have enough time to evolve. Stars that are smaller than the sun have different problems. First of all, planets is their habitable zones will be so close to the stars that they will be “tidally blocked”- that is one side of the planet will always face the star in perpetual daylight with the other side in perpetual night. Another possible obstacle to life on smaller stars is that they tend to vary in their luminosity, or brightness, due to flares and “star spots”. The variation can be large enough to have harmful effects on the ecosystem. 
Of course, not all stars of the right size will give rise to life; they also must have terrestrial planets with the right kind of orbits. Most solar systems have more than one planet, which influence each other’s orbits with their own gravity. Therefore, in order to have a stable system with no planets flying out into space, the width of a star’s habitable zone. This means that for life to evolve, the largest possible number of life-supporting planets in any star’s habitable zone is two. 
Finally, not all planets meeting the above conditions will necessarily develop life. One major threat is large, frequent asteroid and comet impacts, which will wipe out life each time it tries to evolve. The case of Earth teaches that having large gas gains, such as Saturn and Jupiter, in the outer part of the solar system can help keep a planet safe for life. Due to their strong gravitation, they tend to catch or deflect large objects before they can reach Earth

Which is the topic of the passage?

A. The search for intelligent life

B. Conditions necessary for life.

C. Characteristics of extraterrestrial life

D. Life in our solar system

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