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Admita que n(X) represente o número de elementos de um conjunto X. Dados os conjuntos A e B é verdade que:
• n(A ∪ B) = 42
• n(A – B) = 2.n(A ∩ B)
• n(B) = 4.n(A ∩ B)
O valor de n(A) é:
A tabela 'antinutricional' de legumes e verduras que vale a pena conhecer
Fazer bem as compras domésticas tem seus segredos, e entre os mais importantes está o de saber ler o rótulo nutricional dos produtos. Quanta gordura tem este queijo? Aquele tomate refogado leva muito açúcar? Quantas vitaminas há nos iogurtes? Mas a maioria dos compostos químicos presentes nos alimentos não aparece na lista, embora alguns influenciem diretamente a qualidade nutricional do que levamos para casa. Não há um “rótulo antinutricional”, mas os antinutrientes existem, e esses compostos químicos dificultam que o organismo assimile os nutrientes da dieta. Eles estão nas frutas e hortaliças em geral, nos cereais de grão integral (os que são realmente integrais), nos ovos, nas sementes, no cacau puro e até o chá preto – nos dois últimos, na forma de taninos.
A maioria dos antinutrientes é o resultado de uma guerra silenciosa que as plantas travam contra o mundo. São parte das dezenas de milhares de compostos que esses seres vivos desenvolveram, aparentemente apenas para se defenderem dos seus inimigos naturais, que só querem saber de comê-los. “São fitoquímicos, substâncias que exercem funções de proteção da planta contra fatores ambientais externos”, explica Iva Marques, professora da Universidade de Zaragoza.
Nossa comida tem diversas formas de sabotar sua própria qualidade nutricional. A avidina da clara do ovo e o niacina do milho se unem a outras substâncias dos alimentos com um resultado indesejável: inativam as vitaminas; os bociogênicos presentes em muitas frutas e hortaliças bloqueiam o iodo, que faz parte da estrutura da tiroide; os ácidos oxálico e fítico, presentes em alimentos como os espinafres, a beterraba e a acelgas, se juntam no intestino a minerais como o ferro, o zinco e o cálcio e impedem sua absorção. Também há antinutrientes que inibem as proteases e as amilases, que são enzimas que catalisam as reações necessárias para digerir as proteínas e os carboidratos. As enzimas aceleram processos bioquímicos necessários para a digestão e, se desaparecessem, esse processos seriam tão lentos que se tornariam ineficazes.
(Extraído e adaptado de: https://brasil.elpais.com/brasil/2019/
10/03/ciencia/1570102074_391394.html)
Leia a tira em quadrinhos e analise as afirmativas abaixo.
I. No primeiro quadrinho Hagar consultou o velho sábio para saber sobre o segredo da felicidade.
II. No segundo quadrinho as palavras that e me se referem, respectivamente, ao “velho sábio” e a “Hagar”.
III. As palavras do velho sábio no último quadrinho são de que é melhor dar que receber.
Assinale a alternativa correta.
Leia o texto abaixo e responda a questão.
COUCHSURFING!
Imagine you are planning a Holiday in Boston, say, or Sydney, or Dublin. Now, what if you could stay with locals who could give you a guided tour, take you to the best pub or beach, help you improve your English… and all for free? Welcome to the world of Couchsurfing! Yes, Couchsurfing is about a free couch – or bed, or room, or hammock, so it is great for budget travelers. But it is much more than that. The couchsurfing philosophy is about connecting people and cultures. The ethos is “Making the world a better place – one couch at a time.”
The idea was born in San Francisco in 1999. A young man called Casey Fenton was planning a long weekend in Reykjavik. Iceland is expensive and Casey needed cheap accommodation. So he e-mailed over 1,500 Icelandic students in Reykjavik to ask if he could sleep on their couch. Casey was not only offered couches, the students also showed him ‘their’ Reykjavik. Casey decided this was a great way to travel, and launched the site with three friends in 2003. Today the world has more than 2.5 million Couchsurfers, 86,347 of which live in Brazil, the eighth most popular CS country.
(From: BECKER, K. Couchsurfing. Speak up.
São Paulo, n. 290, p. 26, out.2011.)
De acordo com o texto, “Couchsurfing” é uma
maneira de viajar. A esse respeito, assinale a
alternativa correta.
Leia o texto abaixo e responda à questão.
THE ARAL: A DYING SEA
The Aral Sea was once the fourth biggest landlocked sea in the world – 66,100 square kilometers of surface. With abundant fishing resources, the Sea provided a healthy life for thousands of people.
The Aral receives its waters from two rivers – the Amu Dar’ya and the Syr Dar’ya. In 1918, the Soviet government decided to divert the two rivers and use their water to irrigate cotton plantations. These diversions dramatically reduced the volume of the Aral.
As a result, the concentration of salt has doubled and important changes have taken place: fishing industry and other enterprises have ceased: salt concentration in the soil has reduced the area available for agriculture and pastures; unemployment has risen dramatically; quality of drinking water has been declining because of increasing salinity, and bacteriological contamination; the health of the people, animal and plant life have suffered as well.
In the past few decades, the Aral Sea volume has decreased by 75 percent. This is a drastic change and it is human induced. During natural cycles, changes occur slowly, over hundreds of years.
The United Nations Environment Program has recently created the International Fund for Saving the Aral Sea. Even if all steps are taken, a substantial recovery might be achieved only with 20 years.
(From: https://www.unenvironment.org/)
Leia o texto abaixo e responda à questão.
THE ARAL: A DYING SEA
The Aral Sea was once the fourth biggest landlocked sea in the world – 66,100 square kilometers of surface. With abundant fishing resources, the Sea provided a healthy life for thousands of people.
The Aral receives its waters from two rivers – the Amu Dar’ya and the Syr Dar’ya. In 1918, the Soviet government decided to divert the two rivers and use their water to irrigate cotton plantations. These diversions dramatically reduced the volume of the Aral.
As a result, the concentration of salt has doubled and important changes have taken place: fishing industry and other enterprises have ceased: salt concentration in the soil has reduced the area available for agriculture and pastures; unemployment has risen dramatically; quality of drinking water has been declining because of increasing salinity, and bacteriological contamination; the health of the people, animal and plant life have suffered as well.
In the past few decades, the Aral Sea volume has decreased by 75 percent. This is a drastic change and it is human induced. During natural cycles, changes occur slowly, over hundreds of years.
The United Nations Environment Program has recently created the International Fund for Saving the Aral Sea. Even if all steps are taken, a substantial recovery might be achieved only with 20 years.
(From: https://www.unenvironment.org/)
Leia o texto abaixo e responda à questão.
THE ARAL: A DYING SEA
The Aral Sea was once the fourth biggest landlocked sea in the world – 66,100 square kilometers of surface. With abundant fishing resources, the Sea provided a healthy life for thousands of people.
The Aral receives its waters from two rivers – the Amu Dar’ya and the Syr Dar’ya. In 1918, the Soviet government decided to divert the two rivers and use their water to irrigate cotton plantations. These diversions dramatically reduced the volume of the Aral.
As a result, the concentration of salt has doubled and important changes have taken place: fishing industry and other enterprises have ceased: salt concentration in the soil has reduced the area available for agriculture and pastures; unemployment has risen dramatically; quality of drinking water has been declining because of increasing salinity, and bacteriological contamination; the health of the people, animal and plant life have suffered as well.
In the past few decades, the Aral Sea volume has decreased by 75 percent. This is a drastic change and it is human induced. During natural cycles, changes occur slowly, over hundreds of years.
The United Nations Environment Program has recently created the International Fund for Saving the Aral Sea. Even if all steps are taken, a substantial recovery might be achieved only with 20 years.
(From: https://www.unenvironment.org/)
The reading technique that the text above refers to is called:
There's a very obvious place to start for those wishing to improve their reading skills: books! Books not only help you learn a new language. They're also a way to discover the culture behind the language. Thanks to the Internet, paper books aren't your only option for reading practice. Most languages have thousands of books available to download online - many of them free.
The above paragraph refers to one of the four basic language skills. Which language skill does it refer to?
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