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   Acid rain and… the facts
   
   www.acidrain.org.ca / Oxford Children´s Encyclopedia
   
   What causes acid rain?
   Acid rain is caused by air pollution. When fossil fuels such as coal and oil are burned, two gases, sulphur dioxide and nitrogen oxide, are released into the atmosphere. These two pollutants eventually react with the moisture in the air. When this polluted mixture falls onto the ground, it is called acid rain.
   
   Rain measuring between 0 and 5 on the pH scale, is acidic therefore called ACID RAIN.
   
   Acid rain is harmful to the environment. It is hardto control because it may be blown by the wind, falling thousands of kilometers from where it was first formed. For example, much of the acid rain in Canada is caused by smoke from factories and power-stations in the USA. The acid rain in Scandinavia may come from Britain.
   
   What are the effects of acid rain?
   
   Acid rain has many different effects. It has killedfish in the lakes of North America, Scandinavia, Scotland, and Wales. Vast areas of forest in northern and central Europeare dying because of it, while in many European cities statues and stone buildings are being eaten away by the acid. Acid rain corrodes metalwork such as steel bridges and railings; it also attacks some types of concrete. Even the water thatwe drink is slowly being polluted by acid rain.
   
   What are the effects on trees and soil?
   
   One of the most serious impacts of acid precipitation is on forests and soils. Great damage is done when sulphuric acid falls onto the earth as rain. Nutrients present in the soils are washed away. Aluminium also present in the soils is freed and this toxic element can be absorbed by the rootsof trees. Thus, the trees starve to death because they have been deprived of their vital nutrients such as calcium and magnesium.
   
   Acid rain is one of the most serious environmental problems of our time. It is a global problems that is gradually affecting our world.
   
   How does acid rain effect lakes?
   
   Lakes that have been acidified cannot support the same variety of life as healthy lakes. As a lake becomes more acidic, various types of fish disappear. Other effects of acidified lakes on fish include: decreased growth, inability to regulate their own body chemistry, reduced egg deposition, deformities in young fish and increased susceptibility to naturally occurring diseases.
   
   Clean rain usually has a pH of 5.6. It is slightly acidic because of carbon dioxide which is naturally present in the atmosphere. Vinegar, by comparison, is very acidic and has a pH of 3.
   
   What is pH?
   This is a measure of how acidic or alkaline a substance is. (See a pH scale below).
   The initials pH stand for Potential of Hydrogen. Acids have pH values under 7, and alkalis have pHvalues over 7. If a substance has a pH value of 7. It is neutral-neither acidic or alkaline.
   
   

   

   
   
   Because the pH scale is logarithmic, a difference of one pH unit represents a tenfold, or ten times change. For example, the acidity of a sample with a pH of 5 is ten timesgreater than that of a sample with a pH of 6. A difference of 2 units, from 6 to 4, would mean that the acidity in one hundred times greater, and so on.
   
   (Reinildes Dias. Reading Critically in English, 3 rd ed. UFMG 2002. Adaptado.)

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A difference of four units, from six to two, means that the acidity is

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   The (in)appropriate speaker model?

   "Anyone working in the field of English as a Lingua Franca (henceforth ELF) has to face sooner rather than later a serious contradiction: that despite the widespread acceptance of the extensive role of English as an international lingua franca and its increasing number of functions in this respect, there is still an almost equally widespread resistance to this lingua franca’s forms. Given the well-established sociolinguistic fact that languages are shaped by their users, and that nowadays “native speakers are in a minority for [English] language use” (Brumfit 2001, 116), it would make sense for English language teaching to move away from its almost exclusive focus on native varieties of English. This suggestion always meets, however, with strong resistance from many quarters, and this is particularly so in the case of accent. The result is that two particular native speaker English accents, Received Pronunciation (RP) and General American (GA), continue to command special status around the English speaking world including international/lingua franca communication contexts where sociolinguistic common sense indicates that they are inappropriate and irrelevant." Source: adapted from: JENKINS, J. (Un)pleasant? (In)correct? (Un)Intelligible? ELF Speakers' perceptions of their accents. In: MAURANEN, Anna and RANTA, Elina (Ed.).English as a Lingua Franca:Studies and Findings. Newcastle upon Tyne: Cambridge Scholars Publishing, 2009, p.10-35.

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In the text 06, the numbers "116” (line 14) and "35" (in the reference), are, in compliance with Bristish usage, written respectively as:

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Choose the option that shows an example of ordinal numbers:

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Analyzing the numerical figures in Text 1,

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In terms of numerical reference in Text I,

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Read the text below and answer the questions that follow:
Brazil's universities take affirmative action
By Julia Carneiro
BBC Brasil, Rio de Janeiro
28August 2013
Antonio Oliveira has benefited from the “quotas” in the first semester since the law came into effect. As a teenager he had to balance his time between school and helping his parents harvest vegetables to sell at a farmer's market, and doing other small jobs to scrape by.
Until recently, he says the only prospects for those growing up in his city, Colinas, were to work with crops or to get a post at the city hall - “a mediocre job that people think is heaven,” as he puts it. But Antonio has just finished his first term studying Economic Sciences at Rio de Janeiro's prestigious Federal University (UFRJ), a dream he had nurtured since his days at a rural public school.
His placement represents a radical change in the Brazilian university system.
Competition for places
Anew law approved a year ago reserves 50% of spots in Brazil's federal universities for students coming from public schools, low-income families and who are of African or indigenous descent.
“I think this is a life-changing opportunity.I hope I will get a good job after university and be able to give my parents more comfort as they grow old,” said Antonio Oliveira, student.
The number of posts reserved for black, mixed race and indigenous students will vary according to the racial make-up of each Brazilian state.
Ten years ago affirmative action gradually started being adopted in both state and federally funded Brazilian universities, in an attempt to give underprivileged Brazilians better chances of getting free higher education - and thus access to better jobs. Half of Brazil's population is ofAfrican descent, but the country's public universities tend to reflect the Brazilian upper classes - who are mostly white.
Although these universities are free, those who traditionally made it in usually came from expensive private schools. Students from public education - the majority of whom are black or mixed race - were less likely to secure one of the highly competitive places. Now the “quotas” are mandatory in all of Brazil's 59 federal universities, which have until 2016 to reserve half of their positions for affirmative action.
Controversial issue
Antonio Freitas says the country is moving backwards with the quota policies.
But racial quotas have sparked widespread controversy in Brazil. Many who are against them argue that easing access to higher education denies the principle of merit that brings excellence to universities.
“This is bad for the future of Brazil, because the main objective of universities is research, is to achieve quality,” says Antonio Freitas, provost of the Getulio Vargas Foundation, a prestigious private university.
“Eventually you may not have the most qualified people in engineering, in medical school, in the most challenging areas which Brazil needs to develop.”
Adapted from: <

The sentences below provide further information about the studentAntonio Oliveira. Choose the only sentence in which the expression used to refer to his age is correct.

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Answers the question according to the text below.

TEXT I

The time to embrace change in education is right now! In fact, it’s long overdue. Did you know that the model for modern-day public education was created by the need for on-time mechanical workers during the industrial revolution? That was certainly a technological disruption, but it happened 250 years ago. It’s what we call the front-lead method, and it’s not the best model for addressing the learning needs of many students: divergent thinkers, neurodiverse minds, creatives, scientists, and the list goes on. Which brings us to our next point: it’s time for the next wave of disruption. Luckily for us, it’s here. And it’s been here since 1989, when Tim Berners-Lee — a British scientist from CERT — invented the World Wide Web. We know, you use the internet every day, and it’s great, but maybe you’re skeptical that it can revolutionize education. Well, if you didn’t know, it already is. A large body of evidence-based, peer reviewed work points to the web as one of the central hubs for positive educational change today. It’s our connection to others, our access to a world of educational resources, it’s a format that works for many learners, it’s at the heart of countless services (that don’t work in an unconnected world), and it’s driving access to education.
https://www.early-childhood-ed...;
“A large body of evidence-based, peer reviewed work points to the web as ONE of the central hubs for positive educational change today.” The word ONE (line 13) is a:

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Leia o texto abaixo e responda a questão.
Mary is a nice woman. She is a nurse and works in a big hospital. She works at night on weekends. Mary has two young children and they are very intelligent. Their names are "Jack" and "Julie". Jack is nine years old and Julie is eleven years old. Jack likes soccer and Julie loves movies. Jack wants to be a soccer player and Julie wants to be a movie star. Mary likes to be with her children when she isn't working - they play board games together. Mary's family is very happy, especially when Jake, Mary's husband, is at home with them. Jake usually travels a lot and visits different places - he is a truck driver.Leia o trecho abaixo:
“Mary has two young children and they are very intelligent. Their names are "Jack" and "Julie". Jack is nine years old and Julie is eleven years old.”
How many numerals appear in the sentence?